rscg_Interface_to_null_object 2025.125.2045

Interface to Null Object Pattern

Implementation of https://en.wikipedia.org/wiki/Null_object_pattern from interface

Installation

Add to your csproj file:

  <ItemGroup>
    <PackageReference Include="rscg_Interface_to_null_object" Version="2025.125.2045"  OutputItemType="Analyzer" ReferenceOutputAssembly="false"  />
    <PackageReference Include="rscg_Interface_to_null_object_common" Version="2025.125.2045" />
  </ItemGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

Or add the nuget packages rscg_Interface_to_null_object and rscg_Interface_to_null_object_common

Usage

Simple usage

[InterfaceToNullObject.ToNullObject]
public interface IEmployee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public IDepartment Department { get; set; }
    public string GetFullName();
  
}

And then a C# class that implements the interface will be generated

public partial class Employee_null : global::IntegrationConsole.IEmployee
{

        public virtual string FirstName { get; set; } = default(string);
    
        public virtual string LastName { get; set; } = default(string);
    
        public virtual IntegrationConsole.IDepartment Department { get; set; } = default(IntegrationConsole.IDepartment);
    
        public virtual string GetFullName() { return default(string); }
    
}

Adding default values

Let's say you want to return an empty string for the GetFullName method, you can add the following code to your csproj file

<ItemGroup>
  <CompilerVisibleProperty Include="I2NO_String" />
</ItemGroup>
<PropertyGroup>
  <I2NO_String>return ""</I2NO_String>	
</PropertyGroup>

So now the code will be generated like this

public virtual string GetFullName() {  return "" ; }