How to fix System.BadImageFormatException

Nicholas Piazza 531 Reputation points
2021-09-15T17:19:40.473+00:00

I have a project with a method that uses a DLL from another project. It used to work just fine, but now when I try to execute that method, I get the exception:

System.BadImageFormatException: 'Could not load file or assembly 'MyLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. Reference assemblies should not be loaded for execution. They can only be loaded in the Reflection-only loader context. (0x80131058)'

The project file looks like this:
<Project Sdk="Microsft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<LangVersion>9.0</LangVersion>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<Reference Include="MyLibrary">
<HintPath>....\MyLibrary\MyLibrary\obj\Debug\net5.0\ref\MyLibrary.dll</HintPath>
</Reference>
</ItemGroup>

</Project>

How do I fix this problem?

C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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  1. Nicholas Piazza 531 Reputation points
    2021-09-15T19:38:56.447+00:00

    OK, Solved the problem. Was using the DLL from .net5.0\ref. Changed to using the DLL from .net5.0 folder. Thanks for the help.

    2 people found this answer helpful.
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