Could not load file or assembly Microsoft.AspNetCore.Http.Abstractions, Version=5.0.0.0,

Question

I have a console application on net 5.0. I'm trying to load assembly at runtime:

Assembly loadedAssembly = Assembly.LoadFrom(assemblyPath);
var controllers = loadedAssembly.GetExportedTypes();

Method GetExportedTypes throws this exception

Could not load file or assembly 'Microsoft.AspNetCore.Http.Abstractions, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

I don't have such library in any of my project files. Assembly also has target framework 5.0

Can't find similar error by search in internet. What it can be?

Check web.config for auto generated assembly version binding. Check if Microsoft.AspNetCore.Http.Abstraction is there. Correct its version to your system assembly version. — zia khan, Aug 02 '21 at 13:45
Hi what are you trying to load? It's a your dll or an external once? — Stefano Cavion, Aug 02 '21 at 13:53
Run this from nuget package console PM> Get-Project –All | Add-BindingRedirect — zia khan, Aug 03 '21 at 05:02
@ziakhan no, please don't suggest to add bindingredirect. the existence of PackageReference means bindingredirect is not necessary. — Eriawan Kusumawardhono, Aug 03 '21 at 05:09
@ziakhan, I ran binding in my assemly, published it to folder and then tried to load from published directory. The same error — Natalya Mamaeva, Aug 03 '21 at 05:59
https://stackoverflow.com/Questions/4187907/net-picking-wrong-referenced-assembly-version please refer to it. — zia khan, Aug 03 '21 at 06:34
Found in deps.json ` "Microsoft.AspNetCore.Http.Abstractions.Reference": "5.0.0.0"` Why it was generated? I think, it is a mistake — Natalya Mamaeva, Aug 03 '21 at 07:20
I have the same issue with .NET 6. I'm trying to load project which is using the "Microsoft.Net.Sdk.Web" SDK. That's why there is no assembly after publish. Is your application using it or any of its dependencies? — Sarrus, Nov 19 '21 at 13:37

score 2 · Answer 1 · edited Jan 26 '23 at 22:28

2

Add

<FrameworkReference Include="Microsoft.AspNetCore.App" />

to the erroring projects csproj or vbproj file and the error will disappear.

Edit:

The error can occur with v6 DLLs as well:

Could not load file or assembly 'Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0

The solution is to remove the PackageReference and replace it with the FrameworkReference.

edited Jan 26 '23 at 22:28

Jeremy Thompson

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answered Jan 26 '23 at 07:11

Natalya Mamaeva

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Could not load file or assembly Microsoft.AspNetCore.Http.Abstractions, Version=5.0.0.0,

1 Answers1