I wanted to parse some JSON via Json.Decode (System.Web.Helpers.dll) in my app and I was also using HttpContentExtensions.ReadAsAsync method, but I was getting the following error:
An exception of type ‘System.IO.FileNotFoundException’ occurred in mscorlib.dll but was not handled in user code. Additional information: Could not load file or assembly ‘Newtonsoft.Json, Version=220.127.116.11, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed’ or one of its dependencies. The system cannot find the file specified.
Hmm, that’s not very helpful. After little googling and finding that no solution provided works, I started digging.
I had a reference to System.Net.Http.Formatting assembly in my project, because HttpContentExtensions.ReadAsAsync is in that assembly:
Fuslogvw showed following during app runtime:
LOG: DisplayName = Newtonsoft.Json, Version=18.104.22.168, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed (Fully-specified) LOG: Appbase = ... LOG: Initial PrivatePath = NULL LOG: Dynamic Base = NULL LOG: Cache Base = NULL LOG: AppName = ... Calling assembly : System.Net.Http.Formatting, Version=22.214.171.124, Culture=neutral, PublicKeyToken=31bf3856ad364e35. === LOG: This bind starts in default load context. LOG: Using application configuration file: ... LOG: Using host configuration file: LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Post-policy reference: Newtonsoft.Json, Version=126.96.36.199, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed LOG: GAC Lookup was unsuccessful. LOG: Attempting download of new URL ..... LOG: All probing URLs attempted and failed.
See that row with “Calling assembly”? Is that the culprit? Indeed it is:
This kind of dependency is horrible. Current version of https://www.nuget.org/packages/newtonsoft.json/ is 7.0.1!
Assembly redirect to the rescue!
<runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" /> <bindingRedirect oldVersion="188.8.131.52" newVersion="184.108.40.206" /> </dependentAssembly> </assemblyBinding> </runtime>