Source generator to add D/Invoke and indirect syscall methods to a C# project.

A game-changer for C# developers, CsWhispers is a source generator that effortlessly integrates D/Invoke and indirect syscall methods into your projects.

This article provides a quick start guide, demonstrates its powerful features, and explores the potential for extending its capabilities.

Join us on a journey to enhance your C# coding experience with CsWhispers.

Quick Start

Add the latest NuGet package to your project and allow unsafe code.

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


    <!-- CsWhispers package -->
      <PackageReference Include="CsWhispers" Version="0.0.2" />

    <!-- Allow unsafe code -->
    <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">

    <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">


Create a file in your project called CsWhispers.txt and set its build action properties to AdditionalFiles.

  <None Remove="CsWhispers.txt" />
  <AdditionalFiles Include="CsWhispers.txt" />

Add each NT API and any supporting structs/enums that you want to be included in your project. Each must be on its own line, for example:




See The Project Wiki For A Full List Of Supported APIs.

Global namespaces are automatically added to allow for clean code.

public static unsafe void Main()
    // use self as example
    using var self = Process.GetCurrentProcess();
    HANDLE hProcess;
    CLIENT_ID cid = new()
        UniqueProcess = new HANDLE((IntPtr)self.Id)

    var status = NtOpenProcess(

    Console.WriteLine("Status: {0}", status.SeverityCode);
    Console.WriteLine("HANDLE: 0x{0:X}", hProcess.Value.ToInt64());


CsWhispers includes a minimalised version of D/Invoke, so you may also call Generic.GetLibraryAddressGeneric.DynamicFunctionInvoke, etc.


All of the generated code goes into a partial CsWhispers.Syscalls class, which you can extend to add your own APIs. For example, create MyAPIs.cs and add:

namespace CsWhispers;

public static partial class Syscalls
    public static NTSTATUS NtCreateThreadEx()
        // whatever
        return new NTSTATUS(0);

This can then be called in your main code without having to add any additional using statements.

namespace ConsoleApp1;

internal static class Program
    public static void Main()
        var status = NtCreateThreadEx();