Microsoft.Bcl.HashCode
6.0.0
Prefix Reserved
dotnet add package Microsoft.Bcl.HashCode --version 6.0.0
NuGet\Install-Package Microsoft.Bcl.HashCode -Version 6.0.0
<PackageReference Include="Microsoft.Bcl.HashCode" Version="6.0.0" />
paket add Microsoft.Bcl.HashCode --version 6.0.0
#r "nuget: Microsoft.Bcl.HashCode, 6.0.0"
// Install Microsoft.Bcl.HashCode as a Cake Addin #addin nuget:?package=Microsoft.Bcl.HashCode&version=6.0.0 // Install Microsoft.Bcl.HashCode as a Cake Tool #tool nuget:?package=Microsoft.Bcl.HashCode&version=6.0.0
About
Provides the HashCode type for .NET Standard 2.0. This package is not required starting with .NET Standard 2.1 and .NET Core 3.0.
The HashCode type is shipped as part of the shared framework starting with .NET 5.
Key Features
The HashCode type offered in this assembly combines the hash code for multiple values into a single hash code.
How to Use
The static methods in this class combine the default hash codes of up to eight values.
using System;
using System.Collections.Generic;
public struct OrderOrderLine : IEquatable<OrderOrderLine>
{
public int OrderId { get; }
public int OrderLineId { get; }
public OrderOrderLine(int orderId, int orderLineId) => (OrderId, OrderLineId) = (orderId, orderLineId);
public override bool Equals(object obj) => obj is OrderOrderLine o && Equals(o);
public bool Equals(OrderOrderLine other) => OrderId == other.OrderId && OrderLineId == other.OrderLineId;
public override int GetHashCode() => HashCode.Combine(OrderId, OrderLineId);
}
class Program
{
static void Main(string[] args)
{
var set = new HashSet<OrderOrderLine>
{
new OrderOrderLine(1, 1),
new OrderOrderLine(1, 1),
new OrderOrderLine(1, 2)
};
Console.WriteLine($"Item count: {set.Count}.");
}
}
// The example displays the following output:
// Item count: 2.
The instance methods in this class combine the hash codes of more than eight values.
using System;
using System.Collections.Generic;
public struct Path : IEquatable<Path>
{
public IReadOnlyList<string> Segments { get; }
public Path(params string[] segments) => Segments = segments;
public override bool Equals(object obj) => obj is Path o && Equals(o);
public bool Equals(Path other)
{
if (ReferenceEquals(Segments, other.Segments)) return true;
if (Segments is null || other.Segments is null) return false;
if (Segments.Count != other.Segments.Count) return false;
for (var i = 0; i < Segments.Count; i++)
{
if (!string.Equals(Segments[i], other.Segments[i]))
return false;
}
return true;
}
public override int GetHashCode()
{
var hash = new HashCode();
for (var i = 0; i < Segments?.Count; i++)
hash.Add(Segments[i]);
return hash.ToHashCode();
}
}
class Program
{
static void Main(string[] args)
{
var set = new HashSet<Path>
{
new Path("C:", "tmp", "file.txt"),
new Path("C:", "tmp", "file.txt"),
new Path("C:", "tmp", "file.tmp")
};
Console.WriteLine($"Item count: {set.Count}.");
}
}
// The example displays the following output:
// Item count: 2.
The instance methods also combine the hash codes produced by a specific IEqualityComparer<T> implementation.
using System;
using System.Collections.Generic;
public struct Path : IEquatable<Path>
{
public IReadOnlyList<string> Segments { get; }
public Path(params string[] segments) => Segments = segments;
public override bool Equals(object obj) => obj is Path o && Equals(o);
public bool Equals(Path other)
{
if (ReferenceEquals(Segments, other.Segments)) return true;
if (Segments is null || other.Segments is null) return false;
if (Segments.Count != other.Segments.Count) return false;
for (var i = 0; i < Segments.Count; i++)
{
if (!string.Equals(Segments[i], other.Segments[i], StringComparison.OrdinalIgnoreCase))
return false;
}
return true;
}
public override int GetHashCode()
{
var hash = new HashCode();
for (var i = 0; i < Segments?.Count; i++)
hash.Add(Segments[i], StringComparer.OrdinalIgnoreCase);
return hash.ToHashCode();
}
}
class Program
{
static void Main(string[] args)
{
var set = new HashSet<Path>
{
new Path("C:", "tmp", "file.txt"),
new Path("C:", "TMP", "file.txt"),
new Path("C:", "tmp", "FILE.TXT")
};
Console.WriteLine($"Item count: {set.Count}.");
}
}
// The example displays the following output:
// Item count: 1.
The HashCode structure must be passed by-reference to other methods, as it is a value type.
using System;
using System.Collections.Generic;
public struct Path : IEquatable<Path>
{
public IReadOnlyList<string> Segments { get; }
public Path(params string[] segments) => Segments = segments;
public override bool Equals(object obj) => obj is Path o && Equals(o);
public bool Equals(Path other)
{
if (ReferenceEquals(Segments, other.Segments)) return true;
if (Segments is null || other.Segments is null) return false;
if (Segments.Count != other.Segments.Count) return false;
for (var i = 0; i < Segments.Count; i++)
{
if (!PlatformUtils.PathEquals(Segments[i], other.Segments[i]))
return false;
}
return true;
}
public override int GetHashCode()
{
var hash = new HashCode();
for (var i = 0; i < Segments?.Count; i++)
PlatformUtils.AddPath(ref hash, Segments[i]);
return hash.ToHashCode();
}
}
internal static class PlatformUtils
{
public static bool PathEquals(string a, string b) => string.Equals(a, b, StringComparison.OrdinalIgnoreCase);
public static void AddPath(ref HashCode hash, string path) => hash.Add(path, StringComparer.OrdinalIgnoreCase);
}
class Program
{
static void Main(string[] args)
{
var set = new HashSet<Path>
{
new Path("C:", "tmp", "file.txt"),
new Path("C:", "TMP", "file.txt"),
new Path("C:", "tmp", "FILE.TXT")
};
Console.WriteLine($"Item count: {set.Count}.");
}
}
// The example displays the following output:
// Item count: 1.
Main Types
The main types provided by this library are:
- System.HashCode
Additional Documentation
- Security design doc for System.HashCode
- API reference can be found in: https://learn.microsoft.com/en-us/dotnet/api/system.hashcode
License
Microsoft.Bcl.HashCode is released as open source under the MIT license.
Product | Versions 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 is compatible. |
.NET Framework | net461 was computed. net462 is compatible. 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. |
-
.NETFramework 4.6.2
- No dependencies.
-
.NETStandard 2.0
- No dependencies.
-
.NETStandard 2.1
- No dependencies.
-
net6.0
- No dependencies.
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Version | Downloads | Last updated |
---|---|---|
6.0.0 | 68,643 | 11/12/2024 |
1.1.1 | 75,045,936 | 1/12/2021 |
1.1.0 | 207,579,915 | 12/3/2019 |
1.1.0-preview3.19551.4 | 161,214 | 11/13/2019 |
1.1.0-preview2.19523.17 | 31,231 | 11/1/2019 |
1.1.0-preview1.19504.10 | 690 | 10/15/2019 |
1.0.0 | 10,774,852 | 9/23/2019 |
1.0.0-rc1.19456.4 | 1,604 | 9/16/2019 |
1.0.0-preview9.19421.4 | 709 | 9/4/2019 |
1.0.0-preview9.19416.11 | 605 | 9/4/2019 |
1.0.0-preview8.19405.3 | 11,794 | 8/13/2019 |
1.0.0-preview7.19362.9 | 1,870 | 7/23/2019 |
1.0.0-preview6.19303.8 | 53,923 | 6/12/2019 |
1.0.0-preview6.19264.9 | 574 | 9/4/2019 |
1.0.0-preview6.19259.10 | 2,719 | 5/10/2019 |