Newtonsoft.Json版本8.0.2无法加载文件或程序集错误

Question

I'm attempting to parse a JSON file in Class Library within an Web API solution. It is a regular C# Class Library, not the Portable kind.

I've tried every single answer mentioned here , but it still doesn't work! I keep getting the same error which is:

Could not load file or assembly 'Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed

Here is the code:

public IList<BranchRM> AllBranches()
{
    var result = new List<BranchRM>();
    var dataSourcePath = AppDomain.CurrentDomain.BaseDirectory + "Data/branches.json";
    var dataAsText = File.ReadAllText(dataSourcePath);
    if (string.IsNullOrEmpty(dataAsText)) return result;
    var branchList = JsonConvert.DeserializeObject<List<Branch>>(dataAsText);
    result = AutoMapper.Mapper.Map<List<BranchRM>>(branchList);
    return result;
}

Answer 1

I was fixing some old code in one of my Windows Phone 8 solutions and thought of updating the NuGet packages and was greeted with the same issue.

A comment from StivOstenberg here helped me solve this.

This is what I did:

1. Removed the NuGet package. Just clicked 'Uninstall' from NuGet manager. Make sure to remove it from every project in the solution separately .
2. Clean Solution. Rebuild Solution.
3. Now, remove the using statement from your entire solution! Can be done with a quick find and replace for using Newtonsoft.Json on 'Entire Solution'.
4. Repeat step 2. (Ignore the errors)
5. Add package again from NuGet manager & build (Ctrl+Shift+B).
6. Finally (almost), for every error shown , go to the particular page and add reference again .
7. Repeat step 2 and Run.

There might be some redundant steps, but this is exactly what I did, and it worked. Hope it helps you too.

Answer 2

Make sure there are no conflicting versions of Newtonsoft in a parent assembly!

In a child-assembly I wanted to use Newtonsoft.Json.8.0.3.

Well the StartUp project is an MVC5 web app. There I use the BundleTransformer.Less.XXX which had a dependency to Newtonsoft.Json.8.0.2. Upgrading NewtonSoft.Json to 8.0.3 (all the same version now) resolved it for me.