IntroduceInterface causes NullReferenceException crash when interface contains default values

amiy's Avatar


19 Dec, 2017 08:59 AM

When I create an interface with a method containing default argument values, and I use the InstanceLevelAspect to IntroduceInterface it, the compiler fails do to null reference exception.

Code like this:
    public class TestAttribute : InstanceLevelAspect, ITester

    public interface ITester
        void Run(string value = "");

Exception is:

Severity Code Description Project File Line Suppression State
Error Unhandled exception (, postsharp-net40-x64-srv.exe, CLR 4.0.30319.394271, Release): System.NullReferenceException: Object reference not set to an instance of an object.
   at PostSharp.Sdk.Buffers.BufferWriter.WriteRawString(String s, Encoding encoding)
   at ^/vWxD3eYDOIx.^wdkNIZCy[??0](^/fRRnkiTvxqu _0, ??0 _1, ^EyL1LQX01Ck8 _2, ^0RC0kpHqS6Uy _3, Dictionary`2 _4, Int32 _5, Int32 _6)
   at PostSharp.Sdk.Binary.ModuleWriter.WriteConstant(SerializedValue _0, MetadataToken _1, ITypeSignature _2)
   at PostSharp.Sdk.Binary.ModuleWriter.WriteParameter(ParameterDeclaration _0)
   at PostSharp.Sdk.Binary.ModuleWriter.WriteMethodDef(MethodDefDeclaration _0, MetadataToken _1)
   at PostSharp.Sdk.Binary.ModuleWriter.WriteTypeDef(TypeDefDeclaration _0, MetadataToken _1)
   at PostSharp.Sdk.Binary.ModuleWriter.WriteTypeDefs()
   at PostSharp.Sdk.Binary.ModuleWriter.Prepare()
   at ^Up6wxUIUnN6a.^VfvrABjR()
   at ^Up6wxUIUnN6a.^SkiT()
   at ^Up6wxUIUnN6a.^8KD6D2SV(String _0)
   at ^cyC/TYSlPGB/.^wvPm(^RtksFin57NJ8 _0, ^8gP93Xsl\+Imn _1)
   at PostSharp.Sdk.Extensibility.Project.ExecutePhase(String phase)
   at PostSharp.Sdk.Extensibility.Project.Execute()
   at PostSharp.Hosting.PostSharpObject.ExecuteProjects()
   at PostSharp.Hosting.PostSharpObject.InvokeProject(ProjectInvocation projectInvocation). PostSharpTests ***Documents\Visual Studio 2015\Projects\Experiments15\PostSharpTests\POSTSHARP

  1. Support Staff 1 Posted by PostSharp Techn... on 19 Dec, 2017 02:35 PM

    PostSharp Technologies's Avatar


    thanks for reporting the issue, we will be working on a fix.

    (internal issue #15753)

    All the best,

  2. Support Staff 2 Posted by PostSharp Techn... on 03 Jan, 2018 01:18 PM

    PostSharp Technologies's Avatar


    We're closing the ticket for now as the bug has been internally filed as issue #15753. We will contact you as soon as the bug fix has been released.

    For more details on our support policies and prioritization of bug fixes, please visit

    PostSharp Team

  3. PostSharp Technologies closed this discussion on 03 Jan, 2018 01:18 PM.

  4. PostSharp Technologies re-opened this discussion on 27 Jan, 2018 08:04 PM

  5. Support Staff 3 Posted by PostSharp Techn... on 27 Jan, 2018 08:04 PM

    PostSharp Technologies's Avatar


    the bug #15753 has been fixed in the current release of PostSharp 5.0.44.
    Should you need further help with this issue, don't hesitate to re-open this discussion.


  6. PostSharp Technologies closed this discussion on 27 Jan, 2018 08:04 PM.

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