.Net Core : back compatibility problem when loading a legacy .Net 4.7.2 DLL using System.Console.Write() (missing method)

Question

I have a .Net 5.0 C# wrapper that dynamically loads a legacy C++/CLI .NET 4.7.2 assembly
Loading is successful, but I cannot run the code : an exception is raised about a missing System.Console.Write() implementation

This is definitely a .Net 5.0 problem, since if the wrapper is a .NET 4.7.2 assembly, there is no problem at all.

I have attached a minimal project to reproduce TestNetCoreBackCompatibility.zip

Answer 1

Hi,PierreChatelier

I noticed after updating a .NET Core 3.1 app to .NET 5.0, the default build output subfolder changes from "netcoreapp3.1" to "net5.0-windows".

And In your code is <TargetFramework>net5.0-windows7.0</TargetFramework>

You can try to check this link, hope this can help you:

https://stackoverflow.com/questions/64807912/can-a-net-core-5-0-assembly-use-a-net-framework-4-8-targeted-assembly

Best Regards,

Jerry Cai

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