Visual Studio Code for .Net Framework

First thing, the more recent updates for Visual Studio Code do support building and debugging projects for the .NET Framework, but it is very limited.

The GitHub page for OmniSharp (responsible for the C# extension) says that:

The C# extension supports limited full .NET framework debugging. It can only debug 64-bit applications with portable PDBs.

But, even after reading many issues and discussions about this topic, it remained a little bit unclear for me what the necessary steps were, so I will expose here a little guide with the steps that I have followed and that worked for me, and hopefully, will also work for you.

1. The necessary files/folders are:

   a. .vscode with launch.json and tasks.json.

   b. bin\Debug folder for your .exe application and the assemblies you might want to create a reference to.

   d. the <project>.csproj and Program.cs files.

   e. optionally a batch file, whose purpose I will describe later.

2. Install MSBuild 15 (2017).

3. In the <project>.csproj file:

   • change the Project Sdk="Microsoft.NET.Sdk" to Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003".

   • in the first PropertyGroup we must set the OutputType to Exe (the default may be dll), remove the TargetFramework property, replacing with TargetFrameworkVersion with value v4.6.1 (example for .NET Framwork 4.6.1, it may be 4.7 for instance), and finally put the runtimes win-x64 and win7-x64 (and any other that the compiler may complain). This first PropertyGroup should look like this:

     <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
        <RuntimeIdentifiers>win-x64;win7-x64</RuntimeIdentifiers>
     </PropertyGroup>
     

   • set another PropertyGroup` with the following items:

     <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
       <PlatformTarget>x64</PlatformTarget>
       <DebugSymbols>true</DebugSymbols>
       <DebugType>portable</DebugType>
       <Optimize>false</Optimize>
       <OutputPath>bin\Debug\</OutputPath>
       <DefineConstants>DEBUG;TRACE</DefineConstants>
       <ErrorReport>prompt</ErrorReport>
       <WarningLevel>4</WarningLevel>
     </PropertyGroup>
     

   Some comments: the condition used signals that these properties only apply when the configuration passed to the compiler is Debug and the Platform is "AnyCPU", you might want to insert other conditions with different values, or even don't use a condition at all; the most import values here are: The PlatformTarget property must be x64 and the DebugType must be portable; the output path is set to bin\Debug.

   • As we are not using the Microsoft SDK we must include the Program.cs, so that the compiler can find it:

     <ItemGroup>
       <Compile Include="Program.cs" />
     </ItemGroup>
     

   • create the necessary references to your project, for example:

     <ItemGroup>
       <Reference Include="mscorlib" />
       <Reference Include="System.Core" />
       <Reference Include="System.Windows" />
       <Reference Include="System.ServiceModel" />  
       <Reference Include="System.Net" />
       <Reference Include="System.Xml" />
       <Reference Include="System" />
       <Reference Include="System.Xml.Linq" />
       <Reference Include="System.Data.DataSetExtensions" />
       <Reference Include="Microsoft.CSharp" />
       <Reference Include="System.Data" />
       <Reference Include="System.Net.Http" />
     </ItemGroup>
     

   • finally import the following tools (make sure you follow the order exposed here, placing this in the beginning for instance you generate an error)

   The whole thing should look like this:

   <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   
     <PropertyGroup>
       <OutputType>Exe</OutputType>
       <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
       <RuntimeIdentifiers>win-x64;win7-x64</RuntimeIdentifiers>
     </PropertyGroup>
   
     <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
       <PlatformTarget>x64</PlatformTarget>
       <DebugSymbols>true</DebugSymbols>
       <DebugType>portable</DebugType>
       <Optimize>false</Optimize>
       <OutputPath>bin\Debug\</OutputPath>
       <DefineConstants>DEBUG;TRACE</DefineConstants>
       <ErrorReport>prompt</ErrorReport>
       <WarningLevel>4</WarningLevel>
     </PropertyGroup>
   
     <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
       <PlatformTarget>x64</PlatformTarget>
       <DebugType>portable</DebugType>
       <Optimize>true</Optimize>
       <OutputPath>bin\Release\</OutputPath>
       <DefineConstants>TRACE</DefineConstants>
       <ErrorReport>prompt</ErrorReport>
       <WarningLevel>4</WarningLevel>
     </PropertyGroup>
   
     <ItemGroup>
       <Compile Include="Program.cs" />
     </ItemGroup>
   
     <ItemGroup>
       <Reference Include="mscorlib" />
       <Reference Include="System.Core" />
       <Reference Include="System.Windows" />
       <Reference Include="System.ServiceModel" />  
       <Reference Include="System.Net" />
       <Reference Include="System.Xml" />
       <Reference Include="System" />
       <Reference Include="System.Xml.Linq" />
       <Reference Include="System.Data.DataSetExtensions" />
       <Reference Include="Microsoft.CSharp" />
       <Reference Include="System.Data" />
       <Reference Include="System.Net.Http" />
     </ItemGroup>
   
     <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   
   </Project>
   

4. In the launch.json:

   • Create a new configuration(e.g. MyLauncher), whose type must be clr, and that points to your program; the preLaunchTask will be set to a manually configured one ("mybuild", for instance) that will be specified in the tasks.json; an example of the configuration is:

     {
        "version": "0.2.0",
        "configurations": [
             {
                 "name": "MyLauncher",
                 "type":"clr",
                 "request": "launch",
                 "preLaunchTask": "mybuild",
                 "program": "${workspaceFolder}/bin/Debug/<project>.exe",
                 "args":[],
                 "console": "internalConsole",
                 "stopAtEntry": false,
                 "internalConsoleOptions": "openOnSessionStart"
             },
             { other configurations...
             }
         ,]
     }
     

5. In the tasks.json:

   • Create a task "mybuild" with the commands to build your project.

   • We will use the MSBuild 15 here (don't use the dotnet build - at least it has not worked for me).

   • You can directly point to the (path)\MSBuild.exe (or msbuild.exe, if it is in the %PATH%) file with the arguments to build the project. One example is shown below, note that I've set the Configuration to Debug and the platform to AnyCPU, matching the condition Ive set in the .csproj file, also note that the backslashes in \"AnyCPU\" are because of the use of the quotation marks.

     {
         "version": "2.0.0",
         "tasks": [
             {
                 "label": "mybuild",
                 "command":"<path to msbuild>\MSBuild.exe",
                 "type":"shell",
                 "args":[
                     "<project>.csproj",
                     "/t:Build",
                     "/p:Configuration=Debug",
                     "/p:Platform=\"AnyCPU\""
                 ]
             }
         ]
     }
     

   • but there is another way, using the .bat file; in my case the path to the MSBuild.exe had spaces and that was generating an error when the task run, so that I've put the following code in a .bat file (save notepad as name.bat):

     "(path)\MSBuild.exe" (project).csproj /t:Build /p:Configuration=Debug /p:Platform="AnyCPU"
     

     and then set the "mybuild" task to:

     {
         "label": "mybuild",
         "command":"build.bat",
         "type":"shell",
         "args":[]
     }
     

     Where build.bat is the batch file I have created with the previous code.

6. After this, you might have to save, close and reopen the files (this many times fixes problems for me).

7. Set your configuration in the debugger to MyLauncher:

   

8. Run your code with the green play button; it will call the MyLauncher, that first will build your project with MSBuild 15 and then run the exe file

So that was it.

Here are some references:

• https://github.com/OmniSharp/omnisharp-vscode/issues/813
• https://github.com/OmniSharp/omnisharp-vscode/issues/1365
• https://github.com/OmniSharp/omnisharp-vscode/wiki/Portable-PDBs

I just created a simple console application and customized the csproj file. Afterwards, I could attach the OmniSharp debugger to a full .NET framework application. The csproj file looks like this:

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net47</TargetFramework>
    <PlatformTarget>x64</PlatformTarget>
    <DebugType>portable</DebugType>
  </PropertyGroup>

</Project>

I just followed the official documentation: I changed TargetFramework to run on .NET 4.7, the PlatformTarget to 64 bit and the DebugType to portable.

Furthermore, I updated launch.json:

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            "name": ".NET Launch (console)",
            "type": "clr",
            "request": "launch",
            "preLaunchTask": "build",
            // If you have changed target frameworks, make sure to update the program path.
            "program": "${workspaceFolder}/bin/Debug/net47/FullNetInVsCode.exe",
            "args": [],
            "cwd": "${workspaceFolder}",
            // For more information about the 'console' field, see https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md#console-terminal-window
            "console": "internalConsole",
            "stopAtEntry": false,
            "internalConsoleOptions": "openOnSessionStart"
        },
        {
            "name": ".NET Attach",
            "type": "clr",
            "request": "attach",
            "processId": "${command:pickProcess}"
        }
    ,]
}

In this file, I just changed type to clr in both JSON objects, and targeted program to the exe file.

Afterwards, I could set a break point and simply press F5 to start debugging on full .NET framework:

https://code.visualstudio.com/docs/languages/csharp

Quote:

Note: VS Code does not support debugging applications running on the Desktop .NET Framework.

It looks like Visual Studio 'full-fat' IDE remains a requirement for .Net Framework. Major pity.