RSCG – rscg_Interface_to_null_object

RSCG – rscg_Interface_to_null_object
 
 

Generate null objects for interfaces

This is how you can use rscg_Interface_to_null_object .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="rscg_Interface_to_null_object" Version="2025.120.1832" OutputItemType="Analyzer" ReferenceOutputAssembly="false"  />
    <PackageReference Include="rscg_Interface_to_null_object_common" Version="2025.120.1832" />
  </ItemGroup>

	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>
</Project>

The code that you will use is

using NullInterface;

Console.WriteLine("Hello,World!");

Console.WriteLine("Hello,World!");
IDepartment department = new Department_null();
department.Name = "IT";
IEmployee employee = new Employee_null();
employee.FirstName = "Andrei";
employee.Department = department;
Console.WriteLine(employee.FirstName);
Console.WriteLine(employee.Department.Name);

using InterfaceToNullObject;

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

    public string GetFullNameAndDepartment(string separator);
    public bool MoveEmployeeToDepartment(IDepartment department);

}

namespace NullInterface;

using InterfaceToNullObject;

[ToNullObject]
public interface IDepartment
{
    public string Name { get; set; }
}

The code that is generated is

                // <auto-generated/>
                namespace Generated.NullInterface
                {
                    public static class TheAssemblyInfo
                    {
                        
                        public static readonly System.DateTime DateGeneratedUTC ;
                        public const string AssemblyName = "NullInterface";
                        public const string GeneratedNameNice = "Olga Tokarczuk is feeling quick-witted in Quito";
                        public const string GeneratedNameSmall = "quick-witted-Olga Tokarczuk";
                        public const string GeneratedName = "quick-witted-Olga Tokarczuk-Quito";
                        static TheAssemblyInfo(){
                            DateGeneratedUTC = System.DateTime.ParseExact("2025-02-15 15:42:10","yyyy-MM-dd HH:mm:ss",null);
                        }
                    }
                }

// <auto-generated>
    //     This code was generated by a tool :rscg_Interface_to_null_object
    //     Runtime Version: Jaroslav Seifert is feeling cheap in Belmopan
    //     DateOfTool : 2025-01-20 16:33:43
    //     Changes to this file may cause incorrect behavior and will be lost if
    //     the code is regenerated.
    // </auto-generated>
//------------------------------------------------------------------------------
/// <summary>
    /// This static partial class contains extension methods for sorting collections of IDepartment objects.
    /// </summary>

 #nullable enable
 #pragma warning disable CS8603
 #pragma warning disable CS8625
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
[global::System.CodeDom.Compiler.GeneratedCode("GeneratorName","2025.10120.11633.143")]
public partial class Department_null : global::NullInterface.IDepartment
{

        public virtual string Name { get; set; } = default(string);
    
}

#nullable restore
#pragma warning restore CS8603
#pragma warning restore CS8625

// <auto-generated>
    //     This code was generated by a tool :rscg_Interface_to_null_object
    //     Runtime Version: Jaroslav Seifert is feeling cheap in Belmopan
    //     DateOfTool : 2025-01-20 16:33:43
    //     Changes to this file may cause incorrect behavior and will be lost if
    //     the code is regenerated.
    // </auto-generated>
//------------------------------------------------------------------------------
/// <summary>
    /// This static partial class contains extension methods for sorting collections of IEmployee objects.
    /// </summary>

 #nullable enable
 #pragma warning disable CS8603
 #pragma warning disable CS8625
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
[global::System.CodeDom.Compiler.GeneratedCode("GeneratorName","2025.10120.11633.143")]
public partial class Employee_null : global::NullInterface.IEmployee
{

        public virtual string FirstName { get; set; } = default(string);
    
        public virtual string LastName { get; set; } = default(string);
    
        public virtual NullInterface.IDepartment Department { get; set; } = default(NullInterface.IDepartment);
    
        public virtual string GetFullName() { return default(string); }
    
        public virtual string GetFullNameAndDepartment(string separator) { return default(string); }
    
        public virtual bool MoveEmployeeToDepartment(global::NullInterface.IDepartment department) { return default(bool); }
    
}

#nullable restore
#pragma warning restore CS8603
#pragma warning restore CS8625

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/rscg_Interface_to_null_object