A first chance exception of type 'System.IO.FileNotFoundException' occurred in System.Net.Http.Formatting.dll

Question

Using nuget I installed both System.Net.Http.Formatting.dll and Newtonsoft.Json.dll

<package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />

A first chance exception of type 'System.IO.FileNotFoundException' occurred in System.Net.Http.Formatting.dll

Additional information: Could not load file or assembly 'Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.

NOTE : Newtonsoft.Json with version="8.0.3" is already is in use. So how to include two Newtonsoft.Json versions ??

because as error is stating that System.Net.Http.Formatting.dll doesn't find the Newtonsoft.Json with version 4.5.0.0

Answer 1

In order to make this, you've to add one of dll in to a folder named V-1 inside bin folder. Then made config changes like this, (Place the appropriate values for labels in <> eg AssemblyName, Version-1 etc.)

<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
    <dependentAssembly>        
    <assemblyIdentity name="<AssemblyName>" publicKeyToken="<PublicKeyToken>" culture="neutral" />
        <codeBase version="<Version-1>" href="V-1\<AssemblyName>.dll" />
        <codeBase version="<Version-2>" href="<AssemblyName>.dll" />
    </dependentAssembly>      
</assemblyBinding>

Then,

1. Please open Solution Explorer in visual studio
2. Open References under the project
3. Select Newtsoft reference and go to its properties.
4. Set Specific Version = True and Copy Local = False
5. Make sure your output directory does not contain this dll in it.