无法加载文件或程序集'Newtonsoft.Json，Version = 10.0.0.0' - 但bin文件夹中存在二进制文件

Question

I am trying to do something pretty simple here, and I've been stuck on it for several hours. I feel like I've exhausted almost every option.

All I am trying to do is: JsonConvert.SerializeObject(model)

However, the resulting error is:

Exception thrown: 'System.IO.FileLoadException' in mscorlib.dll

Additional information: Could not load file or assembly 'Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=982hs0cm1kd' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

However, in my project, I am referencing version 10.0.0.0. More Specifically, 10.0.2.0. When I checked my bin folder for the project, I can verify that the 10.0.2.0 dll is there. In packages.config, I have <package id="Newtonsoft.Json" version="10.0.2" targetFramework="net452" />

Things I have tried:

1. Manually deleteing the bin/obj folders from the project and rebuilding
2. Manually Modifying the Web.Config file to ensure the right version in the binding redirect.
3. Updating the Reference Property 'Specific Version' to False
4. Manually delete all of the files in C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files/root

I am really stuck here, and I can see this is a common problem as I found a lot of different approaches to fix it, however none have worked so far.

Any ideas?

Answer 1

In package manager console execute: Update-Package –reinstall Newtonsoft.Json.

source

Answer 2

Just had a similar issue. My website and a referenced project (I assume same for assembly) both required Newtonsoft.Json but they had slightly different versions.

Seems the website was winning out, so the site had that version installed and the referenced assembly failed to load "it's" version.

Made sure all the projects had the same version (Manage NuGet Packages for Solution) and worked.