C#•5mo ago

System.TypeLoadException error when executing a dll created via c# .net standard library

i compiled an open source code (from github) into a dll, the code changes an executable's icon and id like to use said code in my python project so i compiled it into a dll and loaded it via using clr (a lib which lets you load c#-compiled dll's into python) it loads in without error and gets improrted fine, the issue is upon excuting a method of the class inside the dll i get the exception

System.TypeLoadException: Could not load type 'System.Runtime.InteropServices.GCHandle' from assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at IconInject.IconInjector.IconFile.FromFile(String filename)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName, UInt32 iconGroupID, UInt32 iconBaseID)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName)

System.TypeLoadException: Could not load type 'System.Runtime.InteropServices.GCHandle' from assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at IconInject.IconInjector.IconFile.FromFile(String filename)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName, UInt32 iconGroupID, UInt32 iconBaseID)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName)

i compiled and loaded multiple sample dlls (simple ones) and they ran fine without issue, from what i gather its an import issue of GCHandle which is (if i understand correctly) unmanged memory allocator im very very newbie with c# and program mostly in python, but i like how fast and verstile c# while prefering the syntax and ease of use of python, hence i use c#- compiled dll's with python, mostly without issues, any help will be appricated!

6 Replies

SpickeyCactus•5mo ago

i mostly understand what each part of the code does, but no where near a proper c# programmer

canton7•5mo ago

Is there an InnerException on the TypeLoadException?

SpickeyCactus•5mo ago

no, this is the entire traceback

Traceback (most recent call last):
  File "C:\path\to\python_project\change_icon.py", line 12, in <module>
    IconInject.IconInjector.InjectIcon(r"C:\path\to\rtgr.exe", r"C:\path\ie.ico")
System.TypeLoadException: Could not load type 'System.Runtime.InteropServices.GCHandle' from assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at IconInject.IconInjector.IconFile.FromFile(String filename)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName, UInt32 iconGroupID, UInt32 iconBaseID)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName)

Traceback (most recent call last):
  File "C:\path\to\python_project\change_icon.py", line 12, in <module>
    IconInject.IconInjector.InjectIcon(r"C:\path\to\rtgr.exe", r"C:\path\ie.ico")
System.TypeLoadException: Could not load type 'System.Runtime.InteropServices.GCHandle' from assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at IconInject.IconInjector.IconFile.FromFile(String filename)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName, UInt32 iconGroupID, UInt32 iconBaseID)
   at IconInject.IconInjector.InjectIcon(String exeFileName, String iconFileName)

canton7•5mo ago

My guess would be that the DLL targets a different .NET version to the one it was loaded into, but I've no idea how your python thingy works

SpickeyCactus•5mo ago

will check into this, thanks!

Lex Li•5mo ago

1) Probably reported and resolved https://github.com/pythonnet/pythonnet/issues 2) NativeAOT might be a better option https://github.com/dotnet/samples/blob/main/core/nativeaot/NativeLibrary/README.md

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System.TypeLoadException error when executing a dll created via c# .net standard library