Dynamically loading ASP .Net Core assemblies into regular .Net Core assemblies

Question

I have a project which targets ASP.Net Core 3.1, as such:

I have another project (which targets .Net Core 3.1 and does not have a framework reference to ASP.Net Core) which needs to dynamically load the above's assembly:

var assembly = Assembly.LoadFrom(filePath);
var references = assembly.GetExportedTypes();

This fails on the second line with following exception:

System.IO.FileNotFoundException: 'Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.'

I don't recall ever having this issue when the assembly being loaded referenced normal assemblies, but for some reason it fails with ASP. This succeeds if the project doing the loading has a framework reference to ASP.Net Core.

How can I load ASP.Net Core assemblies into regular .Net Core assemblies?

Quick demonstration

user_19267348 · Answer

Use **PreserveCompilationReferences** property in your *.csproj to output Microsoft.AspNetCore.Mvc.Core dll (and all framework reference dll's) into your output folder.:

https://docs.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#preservecompilationreferences

Remember to also load assemblies that yours project reference to so it will be able to use them. You can do it by writing your own automatic assembly loader of all dll's in same folder isntead of single one.

Dynamically loading ASP .Net Core assemblies into regular .Net Core assemblies

1 Answers