Создать проект библиотека классов

В файле .csproj приводим к виду:

 **<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net4.8</TargetFramework>
  </PropertyGroup>

    <ItemGroup>
        <Reference Include="ZennoLab.CommandCenter">
            <HintPath>$(ZennoPosterDllPath)\\ZennoLab.CommandCenter.dll</HintPath>
            <Private>false</Private>			     
        </Reference>
        <Reference Include="ZennoLab.Emulation">
            <HintPath>$(ZennoPosterDllPath)\\ZennoLab.Emulation.dll</HintPath>
            <Private>false</Private>			     
        </Reference>
        <Reference Include="ZennoLab.InterfacesLibrary">
            <HintPath>$(ZennoPosterDllPath)\\ZennoLab.InterfacesLibrary.dll</HintPath>
            <Private>false</Private>			     
        </Reference>		 
    </ItemGroup>
	
    <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
        <StartAction>Program</StartAction>
        <StartProgram>$(ZennoPosterDllPath)\\ZennoLab.CodeRunner.exe</StartProgram>
        <StartArguments>50606 "$(MSBuildThisFileDirectory)bin\\Debug\\net4.8\\$(MSBuildProjectName).dll" -sp "$(USER_HOME)\\AppData\\Roaming\\ZennoLab\\ZennoPoster\\7" --run-external-dll</StartArguments>
    </PropertyGroup>

</Project>**

Создаем файл Program.cs и наследуем его от интерфейса IZennoExternalCode:

**public class Program : IZennoExternalCode
{

	public int Execute(Instance instance, IZennoPosterProjectModel project)
	{
		// код проекта
		return 0;
	}
}**