Awesome

FunctionsDI

Generate (constructor) and functions calls similar with ASP.NET Core WebAPI ( [FromServices] will be provided by DI ) Also, verifies for null .

Usage 1 - generate constructors from methods

Reference into the csproj

<ItemGroup>
    <PackageReference Include="RSCG_FunctionsWithDI" Version="2022.7.7.636" ReferenceOutputAssembly="false" OutputItemType="Analyzer" />
    <PackageReference Include="RSCG_FunctionsWithDI_Base" Version="2022.7.7.636" />
</ItemGroup> 	
<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)GeneratedX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

Then for every class you can write [FromServices]

using RSCG_FunctionsWithDI_Base;
//namespace if necessary
public partial class TestDIFunction
{
    public bool TestMyFunc1([FromServices] TestDI1 t1, [FromServices] TestDI2 t2, int x, int y)
    {
        return true;
    }
    //more functions
}

generates the constructor with needed details

public partial class TestDIFunction
{ 
private TestDI1 _TestDI1;
private TestDI2 _TestDI2;
public TestDIFunction  (TestDI1 _TestDI1,TestDI2 _TestDI2) //constructor generated with needed DI
 { 
this._TestDI1=_TestDI1;
this._TestDI2=_TestDI2;

 } //end constructor 

//making call to TestMyFunc1
public bool TestMyFunc1(int  x,int  y){ 
var t1 = this._TestDI1  ;
if(t1 == null) throw new ArgumentException(" service TestDI1  is null in TestDIFunction ");
var t2 = this._TestDI2  ;
if(t2 == null) throw new ArgumentException(" service TestDI2  is null in TestDIFunction ");
return  TestMyFunc1(t1,t2,x,y);
}

so you can call

var test=serviceProvider.GetService<TestDIFunction>();
Console.WriteLine(test.TestMyFunc1(10,3)); // calling without the [FromServices] arguments

Usage 2 - generate constructors from fields / constructors

<ItemGroup>
    <PackageReference Include="RSCG_FunctionsWithDI" Version="2022.7.7.636" ReferenceOutputAssembly="false" OutputItemType="Analyzer" />
    <PackageReference Include="RSCG_FunctionsWithDI_Base" Version="2022.7.7.636" />
</ItemGroup>	
<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)GeneratedX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

Assuming this classes, that you want to keep a minimum of parameters constructors

public partial class TestDIFunctionAdvWithConstructor
    {
        [RSCG_FunctionsWithDI_Base.FromServices]
        private TestDI1 NewTestDI1;

        [RSCG_FunctionsWithDI_Base.FromServices]
        public TestDI2 NewTestDI2 { get; set; }

        public readonly TestDI3 myTestDI3;

        private TestDIFunctionAdvWithConstructor(TestDI3 test)
        {
            myTestDI3= test;
        }
        
    }
    public partial class TestDIFunctionAdvNoConstructor
    {
        [RSCG_FunctionsWithDI_Base.FromServices]
        public TestDI1 NewTestDI1;

        [RSCG_FunctionsWithDI_Base.FromServices]
        private TestDI2 NewTestDI2 { get; set; }




    }

the generator will generate

namespace TestFunctionsWithDI

{ 
public partial class TestDIFunctionAdvNoConstructor
{ 
public TestDIFunctionAdvNoConstructor( TestDI1 _NewTestDI1,TestDI2 _NewTestDI2 ) 
{ 
this.NewTestDI1 = _NewTestDI1; 
this.NewTestDI2 = _NewTestDI2; 
}//end constructor 

 }//class
 }//namespace


namespace TestFunctionsWithDI

{ 
public partial class TestDIFunctionAdvWithConstructor
{ 
public TestDIFunctionAdvWithConstructor(TestDI3 test, TestDI1 _NewTestDI1, TestDI2 _NewTestDI2) : this (test) 
{ 
this.NewTestDI1 = _NewTestDI1; 
this.NewTestDI2 = _NewTestDI2; 
}//end constructor 

 }//class
 }//namespace

Enjoy!

More Roslyn Source Code Generators

You can find more RSCG with examples at Roslyn Source Code Generators