Cannot get CSharpScript.EvaluateAsync to work because of System.Collections.Immutable RRS feed

  • Question

  • I built a simple C# COM Server using DotNet framework 4.7.1

    It has multiple methods and all work ok. However, I added a method to use Roslyn like so:

    int result1 = CSharpScript.EvaluateAsync<int>("2 + 2").Result;

    But when called from another C# program to test like so:

    Object result2 = com.GetType().InvokeMember("EvaluateTest", BindingFlags.Default | BindingFlags.InvokeMethod, null, ssicom, null);

    it fails with:

    System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Collections.Immutable, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.'

    Now I know about the wrong version being in the GAC (1.1.37).

    I have now tried multiple different Nuget package combinations of the packages to support Roslyn including the beta version. Nothing seems to get rid of the System.Collections.Immutable reference. But 1.2.1 does not even exist in Nuget.

    Is it time to abandon Roslyn completely?

    Saturday, April 28, 2018 4:52 PM

All replies

  • BTW, ASMSpy shows:

    Reference: System.Collections.Immutable
      System.Collections.Immutable, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
    Source: NotFound by Microsoft.CodeAnalysis, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35 by Microsoft.CodeAnalysis.CSharp, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35 by Microsoft.CodeAnalysis.CSharp.Scripting, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35 by Microsoft.CodeAnalysis.Scripting, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35
      System.Collections.Immutable, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
    Source: Local, Location: C:\Dev\Project\bin\Debug\System.Collections.Immutable.dll by MyCOM, Version=, Culture=neutral, PublicKeyToken=5ffb4e07ca4e717d by System.Reflection.Metadata, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

    And I did try multiple versions of Microsoft.CodeAnalysis and its subclasses.

    The statement
    int result1 = CSharpScript.EvaluateAsync<int>("2 + 2").Result;

    works in a standalone Console application. But inside the COM server, something is different.

    Saturday, April 28, 2018 5:07 PM
  • Hi genify2,

    Thank you for posting here.

    Have you try to install the version 1.3.0 of System.Collections.Immutable? I installed it from NuGet. When you install it, you could check the version in the property of this assembly. It is 1.2.1.

    I hope this could fix you error.

    Best Regards,


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    Monday, April 30, 2018 7:24 AM