Mono Cecil Error when applying on .Net Core assemblies

[venu gopal Yela]

Hi JB,

I am using Mono Cecil 0.9.6 version to add MSIL (loggers) on .Net Core. assembly.

Here is the code I am using to read assembly.

AssemblyDefinition.ReadAssembly(targetPhysicalPath, new ReaderParameters { AssemblyResolver = resolver, ReadSymbols = true });

when ReadSymbols is not passed to ReaderParameters(), assembly is loaded fine. Below code is working fine.

AssemblyDefinition.ReadAssembly(targetPhysicalPath, new ReaderParameters { AssemblyResolver = resolver });

Exception stack trace is given below: Can you please help? (Above code is working fine for .Net 4.0)

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   at Microsoft.Cci.Pdb.MsfDirectory..ctor(PdbReader reader, PdbFileHeader head, BitAccess bits)
   at Microsoft.Cci.Pdb.PdbFile.LoadFunctions(Stream read, Dictionary`2& tokenToSourceMapping, String& sourceServerData, Int32& age, Guid& guid)
   at Mono.Cecil.Pdb.PdbReader.PopulateFunctions()
   at Mono.Cecil.Pdb.PdbReader.ProcessDebugHeader(ImageDebugDirectory directory, Byte[] header)
   at Mono.Cecil.ModuleDefinition.ProcessDebugHeader()
   at Mono.Cecil.ModuleDefinition.ReadSymbols(ISymbolReader reader)
   at Mono.Cecil.ModuleReader.ReadSymbols(ModuleDefinition module, ReaderParameters parameters)
   at Mono.Cecil.ModuleReader.CreateModuleFrom(Image image, ReaderParameters parameters)
   at Mono.Cecil.ModuleDefinition.ReadModule(Stream stream, ReaderParameters parameters)
   at Mono.Cecil.ModuleDefinition.ReadModule(String fileName, ReaderParameters parameters)
   at Mono.Cecil.AssemblyDefinition.ReadAssembly(String fileName, ReaderParameters parameters)

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Thanks & Regards,

Venu

[Jb Evain]

Hello,

You're probably facing a portable pdb, which are not supported in 0.9. I suggest you move to 0.10, please look at http://cecil.pe as it contains information about the breaking changes.

Jb

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[venu gopal Yela]

Thanks JB. I have choosen pdb only option and version 0.9 worked for me. In case portable pdb is required I will move to version .10.

Regards,

Venu

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[venu gopal Yela]

Hi JB,

I am using Mono Cecil version 0.11.3.0 to read .Net Core 3.1 assembly. Here is the line of code, that is throwing an exception.

var assembly = AssemblyDefinition.ReadAssembly(assemblyPath, new ReaderParameters { ReadSymbols = true });

Exception:

System.BadImageFormatException: 'Format of the executable (.exe) or library (.dll) is invalid.'

Can you please help? (Above line of code is working fine for .Net 4.0) 

Regards,

Venu