MiniExcel 1.33.0

Prefix Reserved
dotnet add package MiniExcel --version 1.33.0                
NuGet\Install-Package MiniExcel -Version 1.33.0                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="MiniExcel" Version="1.33.0" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MiniExcel --version 1.33.0                
#r "nuget: MiniExcel, 1.33.0"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install MiniExcel as a Cake Addin
#addin nuget:?package=MiniExcel&version=1.33.0

// Install MiniExcel as a Cake Tool
#tool nuget:?package=MiniExcel&version=1.33.0                

<div align="center"> <p><a href="https://www.nuget.org/packages/MiniExcel"><img src="https://img.shields.io/nuget/v/MiniExcel.svg" alt="NuGet"></a> <a href="https://www.nuget.org/packages/MiniExcel"><img src="https://img.shields.io/nuget/dt/MiniExcel.svg" alt=""></a> <a href="https://ci.appveyor.com/project/shps951023/miniexcel/branch/master"><img src="https://ci.appveyor.com/api/projects/status/b2vustrwsuqx45f4/branch/master?svg=true" alt="Build status"></a> <a href="https://gitee.com/dotnetchina/MiniExcel"><img src="https://gitee.com/dotnetchina/MiniExcel/badge/star.svg" alt="star"></a> <a href="https://github.com/shps951023/MiniExcel" rel="nofollow"><img src="https://img.shields.io/github/stars/shps951023/MiniExcel?logo=github" alt="GitHub stars"></a> <a href="https://www.nuget.org/packages/MiniExcel"><img src="https://img.shields.io/badge/.NET-%3E%3D%204.5-red.svg" alt="version"></a> </p> </div>


<img align="right" src="https://github.com/dotnet-foundation/swag/blob/main/logo/dotnetfoundation_v4.png?raw=true" width="100" />

<div align="center"> <p>This project is part of the <a href="https://www.dotnetfoundation.org/">.NET Foundation</a> and operates under their <a href="https://www.dotnetfoundation.org/code-of-conduct">code of conduct</a>. </p> </div>


<div align="center"> <p><strong><a href="README.md">English</a> | <a href="README.zh-CN.md">简体中文</a> | <a href="README.zh-Hant.md">繁體中文</a></strong></p> </div>


<div align="center"> Your <a href="https://github.com/shps951023/MiniExcel">Star</a> and <a href="https://miniexcel.github.io">Donate</a> can make MiniExcel better </div>


Introduction

MiniExcel is simple and efficient to avoid OOM's .NET processing Excel tool.

At present, most popular frameworks need to load all the data into the memory to facilitate operation, but it will cause memory consumption problems. MiniExcel tries to use algorithm from a stream to reduce the original 1000 MB occupation to a few MB to avoid OOM(out of memory).

image

Features

  • Low memory consumption, avoid OOM (out of memory) and full GC
  • Support real-time operation of each row of data
  • Support LINQ deferred execution, it can do low-consumption, fast paging and other complex queries
  • Lightweight, without Microsoft Office installed, no COM+, DLL size is less than 150KB
  • Easy API style to read/write/fill excel

Get Started

Installation

You can install the package from NuGet

Release Notes

Please Check Release Notes

TODO

Please Check TODO

Performance

Benchmarks logic can be found in MiniExcel.Benchmarks , and test cli

dotnet run -p .\benchmarks\MiniExcel.Benchmarks\ -c Release -f netcoreapp3.1 -- -f * --join

Output from the latest run is :

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
Intel Core i7-7700 CPU 3.60GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
  [Host]     : .NET Framework 4.8 (4.8.4341.0), X64 RyuJIT
  Job-ZYYABG : .NET Framework 4.8 (4.8.4341.0), X64 RyuJIT
IterationCount=3  LaunchCount=3  WarmupCount=3

Benchmark History : Link

Import/Query Excel

Logic : Test1,000,000x10.xlsx as performance test basic file, 1,000,000 rows * 10 columns "HelloWorld" cells, 23 MB file size

Library Method Max Memory Usage Mean
MiniExcel 'MiniExcel QueryFirst' 0.109 MB 0.0007264 sec
ExcelDataReader 'ExcelDataReader QueryFirst' 15.24 MB 10.66421 sec
MiniExcel 'MiniExcel Query' 17.3 MB 14.17933 sec
ExcelDataReader 'ExcelDataReader Query' 17.3 MB 22.56508 sec
Epplus 'Epplus QueryFirst' 1,452 MB 18.19801 sec
Epplus 'Epplus Query' 1,451 MB 23.64747 sec
OpenXmlSDK 'OpenXmlSDK Query' 1,412 MB 52.00327 sec
OpenXmlSDK 'OpenXmlSDK QueryFirst' 1,413 MB 52.34865 sec
ClosedXml 'ClosedXml QueryFirst' 2,158 MB 66.18897 sec
ClosedXml 'ClosedXml Query' 2,184 MB 191.43412 sec
Export/Create Excel

Logic : create a total of 10,000,000 "HelloWorld" excel

Library Method Max Memory Usage Mean
MiniExcel 'MiniExcel Create Xlsx' 15 MB 11.53181 sec
Epplus 'Epplus Create Xlsx' 1,204 MB 22.50971 sec
OpenXmlSdk 'OpenXmlSdk Create Xlsx' 2,621 MB 42.47399 sec
ClosedXml 'ClosedXml Create Xlsx' 7,141 MB 140.93992 sec

Excel Query/Import <a name="getstart1"></a>

1. Execute a query and map the results to a strongly typed IEnumerable [Try it]

Recommand to use Stream.Query because of better efficiency.

public class UserAccount
{
    public Guid ID { get; set; }
    public string Name { get; set; }
    public DateTime BoD { get; set; }
    public int Age { get; set; }
    public bool VIP { get; set; }
    public decimal Points { get; set; }
}

var rows = MiniExcel.Query<UserAccount>(path);

// or

using (var stream = File.OpenRead(path))
    var rows = stream.Query<UserAccount>();

image

2. Execute a query and map it to a list of dynamic objects without using head [Try it]
  • dynamic key is A.B.C.D..
MiniExcel 1
Github 2

var rows = MiniExcel.Query(path).ToList();

// or
using (var stream = File.OpenRead(path))
{
    var rows = stream.Query().ToList();

    Assert.Equal("MiniExcel", rows[0].A);
    Assert.Equal(1, rows[0].B);
    Assert.Equal("Github", rows[1].A);
    Assert.Equal(2, rows[1].B);
}
3. Execute a query with first header row [Try it]

note : same column name use last right one

Input Excel :

Column1 Column2
MiniExcel 1
Github 2

var rows = MiniExcel.Query(useHeaderRow:true).ToList();

// or

using (var stream = File.OpenRead(path))
{
    var rows = stream.Query(useHeaderRow:true).ToList();

    Assert.Equal("MiniExcel", rows[0].Column1);
    Assert.Equal(1, rows[0].Column2);
    Assert.Equal("Github", rows[1].Column1);
    Assert.Equal(2, rows[1].Column2);
}
4. Query Support LINQ Extension First/Take/Skip ...etc

Query First

var row = MiniExcel.Query(path).First();
Assert.Equal("HelloWorld", row.A);

// or

using (var stream = File.OpenRead(path))
{
    var row = stream.Query().First();
    Assert.Equal("HelloWorld", row.A);
}

Performance between MiniExcel/ExcelDataReader/ClosedXML/EPPlus queryfirst

5. Query by sheet name
MiniExcel.Query(path, sheetName: "SheetName");
//or
stream.Query(sheetName: "SheetName");
6. Query all sheet name and rows
var sheetNames = MiniExcel.GetSheetNames(path);
foreach (var sheetName in sheetNames)
{
    var rows = MiniExcel.Query(path, sheetName: sheetName);
}
7. Get Columns
var columns = MiniExcel.GetColumns(path); // e.g result : ["A","B"...]

var cnt = columns.Count;  // get column count
8. Dynamic Query cast row to IDictionary<string,object>
foreach(IDictionary<string,object> row in MiniExcel.Query(path))
{
    //..
}

// or
var rows = MiniExcel.Query(path).Cast<IDictionary<string,object>>();
9. Query Excel return DataTable

Not recommended, because DataTable will load all data into memory and lose MiniExcel's low memory consumption feature.

var table = MiniExcel.QueryAsDataTable(path, useHeaderRow: true);

image

10. Specify the cell to start reading data
MiniExcel.Query(path,useHeaderRow:true,startCell:"B3")

image

11. Fill Merged Cells

Note: The efficiency is slower compared to not using merge fill

Reason: The OpenXml standard puts mergeCells at the bottom of the file, which leads to the need to foreach the sheetxml twice

    var config = new OpenXmlConfiguration()
    {
        FillMergedCells = true
    };
    var rows = MiniExcel.Query(path, configuration: config);

image

support variable length and width multi-row and column filling

image

12. Reading big file by disk-base cache (Disk-Base Cache - SharedString)

If the SharedStrings size exceeds 5 MB, MiniExcel default will use local disk cache, e.g, 10x100000.xlsx(one million rows data), when disable disk cache the maximum memory usage is 195MB, but able disk cache only needs 65MB. Note, this optimization needs some efficiency cost, so this case will increase reading time from 7.4 seconds to 27.2 seconds, If you don't need it that you can disable disk cache with the following code:

var config = new OpenXmlConfiguration { EnableSharedStringCache = false };
MiniExcel.Query(path,configuration: config)

You can use SharedStringCacheSize to change the sharedString file size beyond the specified size for disk caching

var config = new OpenXmlConfiguration { SharedStringCacheSize=500*1024*1024 };
MiniExcel.Query(path, configuration: config);

image

image

Create/Export Excel <a name="getstart2"></a>

  1. Must be a non-abstract type with a public parameterless constructor .

  2. MiniExcel support parameter IEnumerable Deferred Execution, If you want to use least memory, please do not call methods such as ToList

e.g : ToList or not memory usage image

1. Anonymous or strongly type [Try it]
var path = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.xlsx");
MiniExcel.SaveAs(path, new[] {
    new { Column1 = "MiniExcel", Column2 = 1 },
    new { Column1 = "Github", Column2 = 2}
});
2. IEnumerable<IDictionary<string, object>>
var values = new List<Dictionary<string, object>>()
{
    new Dictionary<string,object>{{ "Column1", "MiniExcel" }, { "Column2", 1 } },
    new Dictionary<string,object>{{ "Column1", "Github" }, { "Column2", 2 } }
};
MiniExcel.SaveAs(path, values);

Create File Result :

Column1 Column2
MiniExcel 1
Github 2
3. IDataReader
  • Recommended, it can avoid to load all data into memory
MiniExcel.SaveAs(path, reader);

image

DataReader export multiple sheets (recommand by Dapper ExecuteReader)

using (var cnn = Connection)
{
    cnn.Open();
    var sheets = new Dictionary<string,object>();
    sheets.Add("sheet1", cnn.ExecuteReader("select 1 id"));
    sheets.Add("sheet2", cnn.ExecuteReader("select 2 id"));
    MiniExcel.SaveAs("Demo.xlsx", sheets);
}
4. Datatable
  • Not recommended, it will load all data into memory

  • DataTable use Caption for column name first, then use columname

var path = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.xlsx");
var table = new DataTable();
{
    table.Columns.Add("Column1", typeof(string));
    table.Columns.Add("Column2", typeof(decimal));
    table.Rows.Add("MiniExcel", 1);
    table.Rows.Add("Github", 2);
}

MiniExcel.SaveAs(path, table);
5. Dapper Query

Thanks @shaofing #552 , please use CommandDefinition + CommandFlags.NoCache

using (var connection = GetConnection(connectionString))
{
    var rows = connection.Query(
        new CommandDefinition(
            @"select 'MiniExcel' as Column1,1 as Column2 union all select 'Github',2"
            , flags: CommandFlags.NoCache)
        );
    // Note: QueryAsync will throw close connection exception
    MiniExcel.SaveAs(path, rows);
}

Below code will load all data into memory

using (var connection = GetConnection(connectionString))
{
    var rows = connection.Query(@"select 'MiniExcel' as Column1,1 as Column2 union all select 'Github',2");
    MiniExcel.SaveAs(path, rows);
}
6. SaveAs to MemoryStream [Try it]
using (var stream = new MemoryStream()) //support FileStream,MemoryStream ect.
{
    stream.SaveAs(values);
}

e.g : api of export excel

public IActionResult DownloadExcel()
{
    var values = new[] {
        new { Column1 = "MiniExcel", Column2 = 1 },
        new { Column1 = "Github", Column2 = 2}
    };

    var memoryStream = new MemoryStream();
    memoryStream.SaveAs(values);
    memoryStream.Seek(0, SeekOrigin.Begin);
    return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
    {
        FileDownloadName = "demo.xlsx"
    };
}
7. Create Multiple Sheets
// 1. Dictionary<string,object>
var users = new[] { new { Name = "Jack", Age = 25 }, new { Name = "Mike", Age = 44 } };
var department = new[] { new { ID = "01", Name = "HR" }, new { ID = "02", Name = "IT" } };
var sheets = new Dictionary<string, object>
{
    ["users"] = users,
    ["department"] = department
};
MiniExcel.SaveAs(path, sheets);

// 2. DataSet
var sheets = new DataSet();
sheets.Add(UsersDataTable);
sheets.Add(DepartmentDataTable);
//..
MiniExcel.SaveAs(path, sheets);

image

8. TableStyles Options

Default style

image

Without style configuration

var config = new OpenXmlConfiguration()
{
     TableStyles = TableStyles.None
};
MiniExcel.SaveAs(path, value,configuration:config);

image

9. AutoFilter

Since v0.19.0 OpenXmlConfiguration.AutoFilter can en/unable AutoFilter , default value is true, and setting AutoFilter way:

MiniExcel.SaveAs(path, value, configuration: new OpenXmlConfiguration() { AutoFilter = false });
10. Create Image
var value = new[] {
    new { Name="github",Image=File.ReadAllBytes(PathHelper.GetFile("images/github_logo.png"))},
    new { Name="google",Image=File.ReadAllBytes(PathHelper.GetFile("images/google_logo.png"))},
    new { Name="microsoft",Image=File.ReadAllBytes(PathHelper.GetFile("images/microsoft_logo.png"))},
    new { Name="reddit",Image=File.ReadAllBytes(PathHelper.GetFile("images/reddit_logo.png"))},
    new { Name="statck_overflow",Image=File.ReadAllBytes(PathHelper.GetFile("images/statck_overflow_logo.png"))},
};
MiniExcel.SaveAs(path, value);

image

11. Byte Array File Export

Since 1.22.0, when value type is byte[] then system will save file path at cell by default, and when import system can be converted to byte[]. And if you don't want to use it, you can set OpenXmlConfiguration.EnableConvertByteArray to false, it can improve the system efficiency.

image

Since 1.22.0, when value type is byte[] then system will save file path at cell by default, and when import system can be converted to byte[]. And if you don't want to use it, you can set OpenXmlConfiguration.EnableConvertByteArray to false, it can improve the system efficiency.

image

12. Merge same cells vertically

This functionality is only supported in xlsx format and merges cells vertically between @merge and @endmerge tags. You can use @mergelimit to limit boundaries of merging cells vertically.

var mergedFilePath = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid().ToString()}.xlsx");

var path = @"../../../../../samples/xlsx/TestMergeWithTag.xlsx";

MiniExcel.MergeSameCells(mergedFilePath, path);
var memoryStream = new MemoryStream();

var path = @"../../../../../samples/xlsx/TestMergeWithTag.xlsx";

memoryStream.MergeSameCells(path);

File content before and after merge:

Without merge limit:

<img width="318" alt="Screenshot 2023-08-07 at 11 59 24" src="https://github.com/mini-software/MiniExcel/assets/38832863/49cc96b9-6c35-4bf3-8d43-a9752a15b22e">

<img width="318" alt="Screenshot 2023-08-07 at 11 59 57" src="https://github.com/mini-software/MiniExcel/assets/38832863/3fbd529b-3ae6-4bbe-b4d8-2793a5a58010">

With merge limit:

<img width="346" alt="Screenshot 2023-08-08 at 18 21 00" src="https://github.com/mini-software/MiniExcel/assets/38832863/04049d28-84d5-4c2a-bcff-5847547df5e1">

<img width="346" alt="Screenshot 2023-08-08 at 18 21 40" src="https://github.com/mini-software/MiniExcel/assets/38832863/f5cf8957-b0b0-4831-b8fc-8556299235c2">

13. Skip null values

New explicit option to write empty cells for null values:

DataTable dt = new DataTable();

/* ... */

DataRow dr = dt.NewRow();

dr["Name1"] = "Somebody once";
dr["Name2"] = null;
dr["Name3"] = "told me.";

dt.Rows.Add(dr);

OpenXmlConfiguration configuration = new OpenXmlConfiguration()
{
     EnableWriteNullValueCell = true // Default value.
};

MiniExcel.SaveAs(@"C:\temp\Book1.xlsx", dt, configuration: configuration);

image

<x:row r="2">
    <x:c r="A2" t ="str" s="2">
        <x:v>Somebody once</x:v>
    </x:c>
    <x:c r="B2" s="2"></x:c>
    <x:c r="C2" t ="str" s="2">
        <x:v>told me.</x:v>
    </x:c>
</x:row>

Previous behavior:

/* ... */

OpenXmlConfiguration configuration = new OpenXmlConfiguration()
{
     EnableWriteNullValueCell = false // Default value is true.
};

MiniExcel.SaveAs(@"C:\temp\Book1.xlsx", dt, configuration: configuration);

image

<x:row r="2">
    <x:c r="A2" t ="str" s="2">
        <x:v>Somebody once</x:v>
    </x:c>
    <x:c r="B2" t ="str" s="2">
        <x:v></x:v>
    </x:c>
    <x:c r="C2" t ="str" s="2">
        <x:v>told me.</x:v>
    </x:c>
</x:row>

Works for null and DBNull values.

Fill Data To Excel Template <a name="getstart3"></a>

  • The declaration is similar to Vue template {{variable name}}, or the collection rendering {{collection name.field name}}
  • Collection rendering support IEnumerable/DataTable/DapperRow
1. Basic Fill

Template: image

Result: image

Code:

// 1. By POCO
var value = new
{
    Name = "Jack",
    CreateDate = new DateTime(2021, 01, 01),
    VIP = true,
    Points = 123
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);


// 2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["Name"] = "Jack",
    ["CreateDate"] = new DateTime(2021, 01, 01),
    ["VIP"] = true,
    ["Points"] = 123
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
2. IEnumerable Data Fill

Note1: Use the first IEnumerable of the same column as the basis for filling list

Template: image

Result: image

Code:

//1. By POCO
var value = new
{
    employees = new[] {
        new {name="Jack",department="HR"},
        new {name="Lisa",department="HR"},
        new {name="John",department="HR"},
        new {name="Mike",department="IT"},
        new {name="Neo",department="IT"},
        new {name="Loan",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

//2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["employees"] = new[] {
        new {name="Jack",department="HR"},
        new {name="Lisa",department="HR"},
        new {name="John",department="HR"},
        new {name="Mike",department="IT"},
        new {name="Neo",department="IT"},
        new {name="Loan",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
3. Complex Data Fill

Note: Support multi-sheets and using same varible

Template:

image

Result:

image

// 1. By POCO
var value = new
{
    title = "FooCompany",
    managers = new[] {
        new {name="Jack",department="HR"},
        new {name="Loan",department="IT"}
    },
    employees = new[] {
        new {name="Wade",department="HR"},
        new {name="Felix",department="HR"},
        new {name="Eric",department="IT"},
        new {name="Keaton",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

// 2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["title"] = "FooCompany",
    ["managers"] = new[] {
        new {name="Jack",department="HR"},
        new {name="Loan",department="IT"}
    },
    ["employees"] = new[] {
        new {name="Wade",department="HR"},
        new {name="Felix",department="HR"},
        new {name="Eric",department="IT"},
        new {name="Keaton",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
4. Fill Big Data Performance

NOTE: Using IEnumerable deferred execution not ToList can save max memory usage in MiniExcel

image

5. Cell value auto mapping type

Template

image

Result

image

Class

public class Poco
{
    public string @string { get; set; }
    public int? @int { get; set; }
    public decimal? @decimal { get; set; }
    public double? @double { get; set; }
    public DateTime? datetime { get; set; }
    public bool? @bool { get; set; }
    public Guid? Guid { get; set; }
}

Code

var poco = new TestIEnumerableTypePoco { @string = "string", @int = 123, @decimal = decimal.Parse("123.45"), @double = (double)123.33, @datetime = new DateTime(2021, 4, 1), @bool = true, @Guid = Guid.NewGuid() };
var value = new
{
    Ts = new[] {
        poco,
        new TestIEnumerableTypePoco{},
        null,
        poco
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
6. Example : List Github Projects

Template

image

Result

image

Code

var projects = new[]
{
    new {Name = "MiniExcel",Link="https://github.com/shps951023/MiniExcel",Star=146, CreateTime=new DateTime(2021,03,01)},
    new {Name = "HtmlTableHelper",Link="https://github.com/shps951023/HtmlTableHelper",Star=16, CreateTime=new DateTime(2020,02,01)},
    new {Name = "PocoClassGenerator",Link="https://github.com/shps951023/PocoClassGenerator",Star=16, CreateTime=new DateTime(2019,03,17)}
};
var value = new
{
    User = "ITWeiHan",
    Projects = projects,
    TotalStar = projects.Sum(s => s.Star)
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
7. Grouped Data Fill
var value = new Dictionary<string, object>()
{
    ["employees"] = new[] {
        new {name="Jack",department="HR"},
        new {name="Jack",department="HR"},
        new {name="John",department="HR"},
        new {name="John",department="IT"},
        new {name="Neo",department="IT"},
        new {name="Loan",department="IT"}
    }
};
await MiniExcel.SaveAsByTemplateAsync(path, templatePath, value);
1. With @group tag and with @header tag

Before

before_with_header

After

after_with_header

2. With @group tag and without @header tag

Before

before_without_header

After

after_without_header

3. Without @group tag

Before

without_group

After

without_group_after

8. If/ElseIf/Else Statements inside cell

Rules:

  1. Supports DateTime, Double, Int with ==, !=, >, >=, <, ⇐ operators.
  2. Supports String with ==, != operators.
  3. Each statement should be new line.
  4. Single space should be added before and after operators.
  5. There shouldn't be new line inside of statements.
  6. Cell should be in exact format as below.
@if(name == Jack)
{{employees.name}}
@elseif(name == Neo)
Test {{employees.name}}
@else
{{employees.department}}
@endif

Before

if_before

After

if_after

9. DataTable as parameter
var managers = new DataTable();
{
    managers.Columns.Add("name");
    managers.Columns.Add("department");
    managers.Rows.Add("Jack", "HR");
    managers.Rows.Add("Loan", "IT");
}
var value = new Dictionary<string, object>()
{
    ["title"] = "FooCompany",
    ["managers"] = managers,
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);
10. Formulas
1. Example

Prefix your formula with $ and use $enumrowstart and $enumrowend to mark references to the enumerable start and end rows:

image

When the template is rendered, the $ prefix will be removed and $enumrowstart and $enumrowend will be replaced with the start and end row numbers of the enumerable:

image

2. Other Example Formulas:
Sum $=SUM(C{{$enumrowstart}}:C{{$enumrowend}})
Alt. Average $=SUM(C{{$enumrowstart}}:C{{$enumrowend}}) / COUNT(C{{$enumrowstart}}:C{{$enumrowend}})
Range $=MAX(C{{$enumrowstart}}:C{{$enumrowend}}) - MIN(C{{$enumrowstart}}:C{{$enumrowend}})
11. Other
1. Checking template parameter key

Since V1.24.0 , default ignore template missing parameter key and replace it with empty string, IgnoreTemplateParameterMissing can control throwing exception or not.

var config = new OpenXmlConfiguration()
{
    IgnoreTemplateParameterMissing = false,
};
MiniExcel.SaveAsByTemplate(path, templatePath, value, config)

image

Excel Column Name/Index/Ignore Attribute <a name="getstart4"></a>

1. Specify the column name, column index, column ignore

Excel Example

image

Code

public class ExcelAttributeDemo
{
    [ExcelColumnName("Column1")]
    public string Test1 { get; set; }
    [ExcelColumnName("Column2")]
    public string Test2 { get; set; }
    [ExcelIgnore]
    public string Test3 { get; set; }
    [ExcelColumnIndex("I")] // system will convert "I" to 8 index
    public string Test4 { get; set; }
    public string Test5 { get; } //wihout set will ignore
    public string Test6 { get; private set; } //un-public set will ignore
    [ExcelColumnIndex(3)] // start with 0
    public string Test7 { get; set; }
}

var rows = MiniExcel.Query<ExcelAttributeDemo>(path).ToList();
Assert.Equal("Column1", rows[0].Test1);
Assert.Equal("Column2", rows[0].Test2);
Assert.Null(rows[0].Test3);
Assert.Equal("Test7", rows[0].Test4);
Assert.Null(rows[0].Test5);
Assert.Null(rows[0].Test6);
Assert.Equal("Test4", rows[0].Test7);
2. Custom Format (ExcelFormatAttribute)

Since V0.21.0 support class which contains ToString(string content) method format

Class

public class Dto
{
    public string Name { get; set; }

    [ExcelFormat("MMMM dd, yyyy")]
    public DateTime InDate { get; set; }
}

Code

var value = new Dto[] {
    new Issue241Dto{ Name="Jack",InDate=new DateTime(2021,01,04)},
    new Issue241Dto{ Name="Henry",InDate=new DateTime(2020,04,05)},
};
MiniExcel.SaveAs(path, value);

Result

image

Query supports custom format conversion

image

3. Set Column Width(ExcelColumnWidthAttribute)
public class Dto
{
    [ExcelColumnWidth(20)]
    public int ID { get; set; }
    [ExcelColumnWidth(15.50)]
    public string Name { get; set; }
}
4. Multiple column names mapping to the same property.
public class Dto
{
    [ExcelColumnName(excelColumnName:"EmployeeNo",aliases:new[] { "EmpNo","No" })]
    public string Empno { get; set; }
    public string Name { get; set; }
}
5. System.ComponentModel.DisplayNameAttribute = ExcelColumnName.excelColumnNameAttribute

Since 1.24.0, system supports System.ComponentModel.DisplayNameAttribute = ExcelColumnName.excelColumnNameAttribute

public class TestIssueI4TXGTDto
{
    public int ID { get; set; }
    public string Name { get; set; }
    [DisplayName("Specification")]
    public string Spc { get; set; }
    [DisplayName("Unit Price")]
    public decimal Up { get; set; }
}
6. ExcelColumnAttribute

Since V1.26.0, multiple attributes can be simplified like :

        public class TestIssueI4ZYUUDto
        {
            [ExcelColumn(Name = "ID",Index =0)]
            public string MyProperty { get; set; }
            [ExcelColumn(Name = "CreateDate", Index = 1,Format ="yyyy-MM",Width =100)]
            public DateTime MyProperty2 { get; set; }
        }
7. DynamicColumnAttribute

Since V1.26.0, we can set the attributes of Column dynamically

            var config = new OpenXmlConfiguration
            {
                DynamicColumns = new DynamicExcelColumn[] {
                    new DynamicExcelColumn("id"){Ignore=true},
                    new DynamicExcelColumn("name"){Index=1,Width=10},
                    new DynamicExcelColumn("createdate"){Index=0,Format="yyyy-MM-dd",Width=15},
                    new DynamicExcelColumn("point"){Index=2,Name="Account Point"},
                }
            };
            var path = PathHelper.GetTempPath();
            var value = new[] { new { id = 1, name = "Jack", createdate = new DateTime(2022, 04, 12) ,point = 123.456} };
            MiniExcel.SaveAs(path, value, configuration: config);

image

8. DynamicSheetAttribute

Since V1.31.4 we can set the attributes of Sheet dynamically. We can set sheet name and state (visibility).

            var configuration = new OpenXmlConfiguration
            {
                DynamicSheets = new DynamicExcelSheet[] {
                    new DynamicExcelSheet("usersSheet") { Name = "Users", State = SheetState.Visible },
                    new DynamicExcelSheet("departmentSheet") { Name = "Departments", State = SheetState.Hidden }
                }
            };

            var users = new[] { new { Name = "Jack", Age = 25 }, new { Name = "Mike", Age = 44 } };
            var department = new[] { new { ID = "01", Name = "HR" }, new { ID = "02", Name = "IT" } };
            var sheets = new Dictionary<string, object>
            {
                ["usersSheet"] = users,
                ["departmentSheet"] = department
            };

            var path = PathHelper.GetTempPath();
            MiniExcel.SaveAs(path, sheets, configuration: configuration);

We can also use new attribute ExcelSheetAttribute:

   [ExcelSheet(Name = "Departments", State = SheetState.Hidden)]
   private class DepartmentDto
   {
      [ExcelColumn(Name = "ID",Index = 0)]
      public string ID { get; set; }
      [ExcelColumn(Name = "Name",Index = 1)]
      public string Name { get; set; }
   }

Add, Delete, Update

Add

v1.28.0 support CSV insert N rows data after last row

// Origin
{
    var value = new[] {
          new { ID=1,Name ="Jack",InDate=new DateTime(2021,01,03)},
          new { ID=2,Name ="Henry",InDate=new DateTime(2020,05,03)},
    };
    MiniExcel.SaveAs(path, value);
}
// Insert 1 rows after last
{
    var value = new { ID=3,Name = "Mike", InDate = new DateTime(2021, 04, 23) };
    MiniExcel.Insert(path, value);
}
// Insert N rows after last
{
    var value = new[] {
          new { ID=4,Name ="Frank",InDate=new DateTime(2021,06,07)},
          new { ID=5,Name ="Gloria",InDate=new DateTime(2022,05,03)},
    };
    MiniExcel.Insert(path, value);
}

image

Delete(waiting)
Update(waiting)

Excel Type Auto Check <a name="getstart5"></a>

  • MiniExcel will check whether it is xlsx or csv based on the file extension by default, but there may be inaccuracy, please specify it manually.
  • Stream cannot be know from which excel, please specify it manually.
stream.SaveAs(excelType:ExcelType.CSV);
//or
stream.SaveAs(excelType:ExcelType.XLSX);
//or
stream.Query(excelType:ExcelType.CSV);
//or
stream.Query(excelType:ExcelType.XLSX);

CSV

Note
  • Default return string type, and value will not be converted to numbers or datetime, unless the type is defined by strong typing generic.
Custom separator

The default is , as the separator, you can modify the Seperator property for customization

var config = new MiniExcelLibs.Csv.CsvConfiguration()
{
    Seperator=';'
};
MiniExcel.SaveAs(path, values,configuration: config);

Since V1.30.1 support function to custom separator (thanks @hyzx86)

var config = new CsvConfiguration()
{
    SplitFn = (row) => Regex.Split(row, $"[\t,](?=(?:[^\"]|\"[^\"]*\")*$)")
        .Select(s => Regex.Replace(s.Replace("\"\"", "\""), "^\"|\"$", "")).ToArray()
};
var rows = MiniExcel.Query(path, configuration: config).ToList();
Custom line break

The default is \r\n as the newline character, you can modify the NewLine property for customization

var config = new MiniExcelLibs.Csv.CsvConfiguration()
{
    NewLine='\n'
};
MiniExcel.SaveAs(path, values,configuration: config);
Custom coding
  • The default encoding is "Detect Encoding From Byte Order Marks" (detectEncodingFromByteOrderMarks: true)
  • f you have custom encoding requirements, please modify the StreamReaderFunc / StreamWriterFunc property
// Read
var config = new MiniExcelLibs.Csv.CsvConfiguration()
{
    StreamReaderFunc = (stream) => new StreamReader(stream,Encoding.GetEncoding("gb2312"))
};
var rows = MiniExcel.Query(path, true,excelType:ExcelType.CSV,configuration: config);

// Write
var config = new MiniExcelLibs.Csv.CsvConfiguration()
{
    StreamWriterFunc = (stream) => new StreamWriter(stream, Encoding.GetEncoding("gb2312"))
};
MiniExcel.SaveAs(path, value,excelType:ExcelType.CSV, configuration: config);
Read empty string as null

By default, empty values are mapped to string.Empty. You can modify this behavior

var config = new MiniExcelLibs.Csv.CsvConfiguration()
{
   ReadEmptyStringAsNull = true
};

DataReader

1. GetReader

Since 1.23.0, you can GetDataReader

    using (var reader = MiniExcel.GetReader(path,true))
    {
        while (reader.Read())
        {
            for (int i = 0; i < reader.FieldCount; i++)
            {
                var value = reader.GetValue(i);
            }
        }
    }

Async

public static Task SaveAsAsync(string path, object value, bool printHeader = true, string sheetName = "Sheet1", ExcelType excelType = ExcelType.UNKNOWN, IConfiguration configuration = null)
public static Task SaveAsAsync(this Stream stream, object value, bool printHeader = true, string sheetName = "Sheet1", ExcelType excelType = ExcelType.XLSX, IConfiguration configuration = null)
public static Task<IEnumerable<dynamic>> QueryAsync(string path, bool useHeaderRow = false, string sheetName = null, ExcelType excelType = ExcelType.UNKNOWN, string startCell = "A1", IConfiguration configuration = null)
public static Task<IEnumerable<T>> QueryAsync<T>(this Stream stream, string sheetName = null, ExcelType excelType = ExcelType.UNKNOWN, string startCell = "A1", IConfiguration configuration = null) where T : class, new()
public static Task<IEnumerable<T>> QueryAsync<T>(string path, string sheetName = null, ExcelType excelType = ExcelType.UNKNOWN, string startCell = "A1", IConfiguration configuration = null) where T : class, new()
public static Task<IEnumerable<IDictionary<string, object>>> QueryAsync(this Stream stream, bool useHeaderRow = false, string sheetName = null, ExcelType excelType = ExcelType.UNKNOWN, string startCell = "A1", IConfiguration configuration = null)
public static Task SaveAsByTemplateAsync(this Stream stream, string templatePath, object value)
public static Task SaveAsByTemplateAsync(this Stream stream, byte[] templateBytes, object value)
public static Task SaveAsByTemplateAsync(string path, string templatePath, object value)
public static Task SaveAsByTemplateAsync(string path, byte[] templateBytes, object value)
public static Task<DataTable> QueryAsDataTableAsync(string path, bool useHeaderRow = true, string sheetName = null, ExcelType excelType = ExcelType.UNKNOWN, string startCell = "A1", IConfiguration configuration = null)
  • v1.25.0 support cancellationToken

Others

1. Enum

Be sure excel & property name same, system will auto mapping (case insensitive)

image

Since V0.18.0 support Enum Description

public class Dto
{
    public string Name { get; set; }
    public I49RYZUserType UserType { get; set; }
}

public enum Type
{
    [Description("General User")]
    V1,
    [Description("General Administrator")]
    V2,
    [Description("Super Administrator")]
    V3
}

image

Since 1.30.0 version support excel Description to Enum , thanks @KaneLeung

2. Convert CSV to XLSX or Convert XLSX to CSV
MiniExcel.ConvertXlsxToCsv(xlsxPath, csvPath);
MiniExcel.ConvertXlsxToCsv(xlsxStream, csvStream);
MiniExcel.ConvertCsvToXlsx(csvPath, xlsxPath);
MiniExcel.ConvertCsvToXlsx(csvStream, xlsxStream);
using (var excelStream = new FileStream(path: filePath, FileMode.Open, FileAccess.Read))
using (var csvStream = new MemoryStream())
{
   MiniExcel.ConvertXlsxToCsv(excelStream, csvStream);
}
3. Custom CultureInfo

Since 1.22.0, you can custom CultureInfo like below, system default CultureInfo.InvariantCulture.

var config = new CsvConfiguration()
{
    Culture = new CultureInfo("fr-FR"),
};
MiniExcel.SaveAs(path, value, configuration: config);

// or
MiniExcel.Query(path, configuration: config);
4. Custom Buffer Size
    public abstract class Configuration : IConfiguration
    {
        public int BufferSize { get; set; } = 1024 * 512;
    }
5. FastMode

System will not control memory, but you can get faster save speed.

var config = new OpenXmlConfiguration() { FastMode = true };
MiniExcel.SaveAs(path, reader,configuration:config);

Examples:

1. SQLite & Dapper Large Size File SQL Insert Avoid OOM

note : please don't call ToList/ToArray methods after Query, it'll load all data into memory

using (var connection = new SQLiteConnection(connectionString))
{
    connection.Open();
    using (var transaction = connection.BeginTransaction())
    using (var stream = File.OpenRead(path))
    {
       var rows = stream.Query();
       foreach (var row in rows)
             connection.Execute("insert into T (A,B) values (@A,@B)", new { row.A, row.B }, transaction: transaction);
       transaction.Commit();
    }
}

performance: image

2. ASP.NET Core 3.1 or MVC 5 Download/Upload Excel Xlsx API Demo Try it
public class ApiController : Controller
{
    public IActionResult Index()
    {
        return new ContentResult
        {
            ContentType = "text/html",
            StatusCode = (int)HttpStatusCode.OK,
            Content = @"<html><body>
<a href='api/DownloadExcel'>DownloadExcel</a><br>
<a href='api/DownloadExcelFromTemplatePath'>DownloadExcelFromTemplatePath</a><br>
<a href='api/DownloadExcelFromTemplateBytes'>DownloadExcelFromTemplateBytes</a><br>
<p>Upload Excel</p>
<form method='post' enctype='multipart/form-data' action='/api/uploadexcel'>
    <input type='file' name='excel'> <br>
    <input type='submit' >
</form>
</body></html>"
        };
    }

    public IActionResult DownloadExcel()
    {
        var values = new[] {
            new { Column1 = "MiniExcel", Column2 = 1 },
            new { Column1 = "Github", Column2 = 2}
        };
        var memoryStream = new MemoryStream();
        memoryStream.SaveAs(values);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    public IActionResult DownloadExcelFromTemplatePath()
    {
        string templatePath = "TestTemplateComplex.xlsx";

        Dictionary<string, object> value = new Dictionary<string, object>()
        {
            ["title"] = "FooCompany",
            ["managers"] = new[] {
                new {name="Jack",department="HR"},
                new {name="Loan",department="IT"}
            },
            ["employees"] = new[] {
                new {name="Wade",department="HR"},
                new {name="Felix",department="HR"},
                new {name="Eric",department="IT"},
                new {name="Keaton",department="IT"}
            }
        };

        MemoryStream memoryStream = new MemoryStream();
        memoryStream.SaveAsByTemplate(templatePath, value);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    private static Dictionary<string, Byte[]> TemplateBytesCache = new Dictionary<string, byte[]>();

    static ApiController()
    {
        string templatePath = "TestTemplateComplex.xlsx";
        byte[] bytes = System.IO.File.ReadAllBytes(templatePath);
        TemplateBytesCache.Add(templatePath, bytes);
    }

    public IActionResult DownloadExcelFromTemplateBytes()
    {
        byte[] bytes = TemplateBytesCache["TestTemplateComplex.xlsx"];

        Dictionary<string, object> value = new Dictionary<string, object>()
        {
            ["title"] = "FooCompany",
            ["managers"] = new[] {
                new {name="Jack",department="HR"},
                new {name="Loan",department="IT"}
            },
            ["employees"] = new[] {
                new {name="Wade",department="HR"},
                new {name="Felix",department="HR"},
                new {name="Eric",department="IT"},
                new {name="Keaton",department="IT"}
            }
        };

        MemoryStream memoryStream = new MemoryStream();
        memoryStream.SaveAsByTemplate(bytes, value);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    public IActionResult UploadExcel(IFormFile excel)
    {
        var stream = new MemoryStream();
        excel.CopyTo(stream);

        foreach (var item in stream.Query(true))
        {
            // do your logic etc.
        }

        return Ok("File uploaded successfully");
    }
}
3. Paging Query
void Main()
{
    var rows = MiniExcel.Query(path);

    Console.WriteLine("==== No.1 Page ====");
    Console.WriteLine(Page(rows,pageSize:3,page:1));
    Console.WriteLine("==== No.50 Page ====");
    Console.WriteLine(Page(rows,pageSize:3,page:50));
    Console.WriteLine("==== No.5000 Page ====");
    Console.WriteLine(Page(rows,pageSize:3,page:5000));
}

public static IEnumerable<T> Page<T>(IEnumerable<T> en, int pageSize, int page)
{
    return en.Skip(page * pageSize).Take(pageSize);
}

20210419

4. WebForm export Excel by memorystream
var fileName = "Demo.xlsx";
var sheetName = "Sheet1";
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
response.AddHeader("Content-Disposition", $"attachment;filename=\"{fileName}\"");
var values = new[] {
    new { Column1 = "MiniExcel", Column2 = 1 },
    new { Column1 = "Github", Column2 = 2}
};
var memoryStream = new MemoryStream();
memoryStream.SaveAs(values, sheetName: sheetName);
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.CopyTo(Response.OutputStream);
response.End();
5. Dynamic i18n multi-language and role authority management

Like the example, create a method to handle i18n and permission management, and use yield return to return IEnumerable<Dictionary<string, object>> to achieve dynamic and low-memory processing effects

void Main()
{
    var value = new Order[] {
        new Order(){OrderNo = "SO01",CustomerID="C001",ProductID="P001",Qty=100,Amt=500},
        new Order(){OrderNo = "SO02",CustomerID="C002",ProductID="P002",Qty=300,Amt=400},
    };

    Console.WriteLine("en-Us and Sales role");
    {
        var path = Path.GetTempPath() + Guid.NewGuid() + ".xlsx";
        var lang = "en-US";
        var role = "Sales";
        MiniExcel.SaveAs(path, GetOrders(lang, role, value));
        MiniExcel.Query(path, true).Dump();
    }

    Console.WriteLine("zh-CN and PMC role");
    {
        var path = Path.GetTempPath() + Guid.NewGuid() + ".xlsx";
        var lang = "zh-CN";
        var role = "PMC";
        MiniExcel.SaveAs(path, GetOrders(lang, role, value));
        MiniExcel.Query(path, true).Dump();
    }
}

private IEnumerable<Dictionary<string, object>> GetOrders(string lang, string role, Order[] orders)
{
    foreach (var order in orders)
    {
        var newOrder = new Dictionary<string, object>();

        if (lang == "zh-CN")
        {
            newOrder.Add("客户编号", order.CustomerID);
            newOrder.Add("订单编号", order.OrderNo);
            newOrder.Add("产品编号", order.ProductID);
            newOrder.Add("数量", order.Qty);
            if (role == "Sales")
                newOrder.Add("价格", order.Amt);
            yield return newOrder;
        }
        else if (lang == "en-US")
        {
            newOrder.Add("Customer ID", order.CustomerID);
            newOrder.Add("Order No", order.OrderNo);
            newOrder.Add("Product ID", order.ProductID);
            newOrder.Add("Quantity", order.Qty);
            if (role == "Sales")
                newOrder.Add("Amount", order.Amt);
            yield return newOrder;
        }
        else
        {
            throw new InvalidDataException($"lang {lang} wrong");
        }
    }
}

public class Order
{
    public string OrderNo { get; set; }
    public string CustomerID { get; set; }
    public decimal Qty { get; set; }
    public string ProductID { get; set; }
    public decimal Amt { get; set; }
}

image

FAQ

Q: Excel header title not equal class property name, how to mapping?
  1. Please use ExcelColumnName attribute

image

Q. How to query or export multiple-sheets?
  1. GetSheetNames method with Query sheetName parameter.
var sheets = MiniExcel.GetSheetNames(path);
foreach (var sheet in sheets)
{
    Console.WriteLine($"sheet name : {sheet} ");
    var rows = MiniExcel.Query(path,useHeaderRow:true,sheetName:sheet);
    Console.WriteLine(rows);
}

image

Q. How to query or export information about sheet visibility?
  1. GetSheetInformations method.
var sheets = MiniExcel.GetSheetInformations(path);
foreach (var sheetInfo in sheets)
{
    Console.WriteLine($"sheet index : {sheetInfo.Index} "); // next sheet index - numbered from 0
    Console.WriteLine($"sheet name : {sheetInfo.Name} ");   // sheet name
    Console.WriteLine($"sheet state : {sheetInfo.State} "); // sheet visibility state - visible / hidden
}
Q. Whether to use Count will load all data into the memory?

No, the image test has 1 million rows*10 columns of data, the maximum memory usage is <60MB, and it takes 13.65 seconds

image

Q. How does Query use integer indexs?

The default index of Query is the string Key: A,B,C.... If you want to change to numeric index, please create the following method to convert

void Main()
{
    var path = @"D:\git\MiniExcel\samples\xlsx\TestTypeMapping.xlsx";
    var rows = MiniExcel.Query(path,true);
    foreach (var r in ConvertToIntIndexRows(rows))
    {
        Console.Write($"column 0 : {r[0]} ,column 1 : {r[1]}");
        Console.WriteLine();
    }
}

private IEnumerable<Dictionary<int, object>> ConvertToIntIndexRows(IEnumerable<object> rows)
{
    ICollection<string> keys = null;
    var isFirst = true;
    foreach (IDictionary<string,object> r in rows)
    {
        if(isFirst)
        {
            keys = r.Keys;
            isFirst = false;
        }

        var dic = new Dictionary<int, object>();
        var index = 0;
        foreach (var key in keys)
            dic[index++] = r[key];
        yield return dic;
    }
}
Q. No title empty excel is generated when the value is empty when exporting Excel

Because MiniExcel uses a logic similar to JSON.NET to dynamically get type from values to simplify API operations, type cannot be knew without data. You can check issue #133 for understanding.

image

Strong type & DataTable will generate headers, but Dictionary are still empty Excel

Q. How to stop the foreach when blank row?

MiniExcel can be used with LINQ TakeWhile to stop foreach iterator.

Image

Q. How to remove empty rows?

image

IEnumerable :

public static IEnumerable<dynamic> QueryWithoutEmptyRow(Stream stream, bool useHeaderRow, string sheetName, ExcelType excelType, string startCell, IConfiguration configuration)
{
    var rows = stream.Query(useHeaderRow,sheetName,excelType,startCell,configuration);
    foreach (IDictionary<string,object> row in rows)
    {
        if(row.Keys.Any(key=>row[key]!=null))
            yield return row;
    }
}

DataTable :

public static DataTable QueryAsDataTableWithoutEmptyRow(Stream stream, bool useHeaderRow, string sheetName, ExcelType excelType, string startCell, IConfiguration configuration)
{
    if (sheetName == null && excelType != ExcelType.CSV) /*Issue #279*/
        sheetName = stream.GetSheetNames().First();

    var dt = new DataTable(sheetName);
    var first = true;
    var rows = stream.Query(useHeaderRow,sheetName,excelType,startCell,configuration);
    foreach (IDictionary<string, object> row in rows)
    {
        if (first)
        {

            foreach (var key in row.Keys)
            {
                var column = new DataColumn(key, typeof(object)) { Caption = key };
                dt.Columns.Add(column);
            }

            dt.BeginLoadData();
            first = false;
        }

        var newRow = dt.NewRow();
        var isNull=true;
        foreach (var key in row.Keys)
        {
            var _v = row[key];
            if(_v!=null)
                isNull = false;
            newRow[key] = _v;
        }

        if(!isNull)
            dt.Rows.Add(newRow);
    }

    dt.EndLoadData();
    return dt;
}
Q. How SaveAs(path,value) to replace exists file and without throwing "The file ...xlsx already exists error"

Please use Stream class to custom file creating logic, e.g:

    using (var stream = File.Create("Demo.xlsx"))
        MiniExcel.SaveAs(stream,value);

or, since V1.25.0, SaveAs support overwriteFile parameter for enable/unable overwriting exist file

    MiniExcel.SaveAs(path, value, overwriteFile: true);

Limitations and caveats

  • Not support xls and encrypted file now
  • xlsm only support Query

Reference

ExcelDataReader / ClosedXML / Dapper / ExcelNumberFormat

Thanks

Jetbrains

jetbrains-variant-2

Thanks for providing a free All product IDE for this project (License)

Benefit

Link https://github.com/mini-software/MiniExcel/issues/560#issue-2080619180

Contributors

alternate text is missing from this package README image

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETFramework 4.5

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.
  • net6.0

    • No dependencies.

NuGet packages (95)

Showing the top 5 NuGet packages that depend on MiniExcel:

Package Downloads
GuoKun.CPS

国坤CPS库

NF.Utilities

公共类库,增加DataTable转excel

DH.MiniExcel

DH框架的Excel处理库。基于https://github.com/mini-software/MiniExcel

TXQ.Utils

Package Description

BootstrapBlazor.TableExport

Bootstrap UI components extensions of export

GitHub repositories (9)

Showing the top 5 popular GitHub repositories that depend on MiniExcel:

Repository Stars
Scighost/Starward
Game Launcher for miHoYo - 米家游戏启动器
dotnetcore/Magicodes.IE
Import and export general library, support Dto import and export, template export, fancy export and dynamic export, support Excel, Csv, Word, Pdf and Html.
dotnetcore/BootstrapBlazor
A set of enterprise-class UI components based on Bootstrap and Blazor
xunkong/xunkong
记录旅途中发生的事
izhaorui/Zr.Admin.NET
🎉ZR.Admin.NET是一款前后端分离的、跨平台基于RBAC的通用权限管理后台。ORM采用SqlSugar。前端采用Vue、AntDesign,支持多租户、缓存、任务调度、支持统一异常处理、接口限流、支持一键生成前后端代码,支持动态国际化翻译(Vue3),等诸多黑科技,代码简洁易懂、易扩展让开发更简单、更通用。
Version Downloads Last updated
1.33.0 16,390 7/7/2024
1.32.1 53,054 5/16/2024
1.32.0 11,837 5/12/2024
1.31.3 274,322 12/27/2023
1.31.2 418,137 8/10/2023
1.31.0 201,274 5/28/2023
1.30.3 75,047 5/1/2023
1.30.2 346,432 2/21/2023
1.30.1 29,614 2/7/2023
1.30.0 186,740 12/27/2022
1.29.0 179,083 11/9/2022
1.28.5 17,912 10/30/2022
1.28.4 2,836 10/29/2022
1.28.2 2,823 10/29/2022
1.28.1 23,524 10/22/2022
1.28.0 64,934 9/19/2022
1.27.0 3,604 9/18/2022
1.26.7 10,789 9/9/2022
1.26.6 9,959 9/4/2022
1.26.5 288,111 6/30/2022
1.26.4 6,297 6/26/2022
1.26.3 224,302 6/7/2022
1.26.2 171,819 4/21/2022
1.26.1 10,168 4/17/2022
1.26.0 218,142 4/12/2022
1.24.2 3,121 3/17/2022
1.24.1 4,653 3/15/2022
1.24.0 14,449 3/9/2022
1.23.2 7,198 3/4/2022
1.23.1 225,641 2/14/2022
1.22.0 3,076 2/12/2022
0.21.5 30,452 2/7/2022
0.21.4 8,137 1/27/2022
0.19.1 274,340 11/15/2021
0.19.0 12,353 10/21/2021
0.18.0 15,845 9/13/2021
0.17.5 246,782 8/20/2021
0.17.4 4,789 8/17/2021
0.17.2 251,175 6/30/2021
0.17.1 6,016 6/23/2021
0.17.0 5,829 6/21/2021
0.16.1 4,344 6/19/2021
0.16.0 3,101 6/19/2021
0.15.5 4,697 6/13/2021
0.15.4 3,234 6/8/2021
0.15.2 9,754 5/20/2021
0.15.1 3,024 5/19/2021
0.14.8 3,487 5/18/2021
0.14.7 3,290 5/17/2021
0.14.6 4,444 5/13/2021
0.14.5 3,432 5/12/2021
0.14.4 3,021 5/12/2021
0.14.3 4,529 5/10/2021
0.14.2 3,021 5/10/2021
0.14.1 4,383 5/7/2021
0.14.0 3,096 5/7/2021
0.13.5 4,682 4/30/2021
0.13.4 5,077 4/26/2021
0.13.3 5,208 4/22/2021
0.13.2 4,658 4/20/2021
0.13.1 3,177 4/18/2021
0.13.0 2,964 4/16/2021
0.12.2 2,892 4/15/2021
0.12.1 2,804 4/14/2021
0.12.0-beta 2,205 4/13/2021
0.11.1 4,189 4/9/2021
0.11.0 2,886 4/8/2021
0.10.3 2,883 4/6/2021
0.10.2 2,835 4/6/2021
0.10.1 2,863 4/4/2021
0.10.0 2,864 4/2/2021
0.9.1 2,905 4/1/2021
0.9.0 2,798 4/1/2021
0.8.0 3,087 3/29/2021
0.7.0 2,856 3/28/2021
0.6.0 2,877 3/26/2021
0.5.0 2,841 3/26/2021
0.4.0 2,855 3/25/2021
0.3.0 2,818 3/21/2021
0.2.3 2,921 3/20/2021
0.2.2 3,170 3/18/2021
0.2.1 3,060 3/17/2021
0.2.0 3,095 3/15/2021
0.1.0-preview 2,383 3/15/2021
0.0.7-beta 2,370 3/14/2021
0.0.6-beta 2,395 3/14/2021
0.0.5-beta 2,505 3/14/2021
0.0.4-beta 2,388 3/14/2021
0.0.3-beta 2,369 3/13/2021
0.0.2-beta 2,321 3/4/2021
0.0.1-beta 2,291 3/3/2021