I have a strange issue, which drives me crazy…

I have a simple Class Library Project (Full .NET Framework, 4.6.1) with a wrapper class for functionality around Cosmos DB. Therefore I have added the “Microsoft.Azure.DocumentDB” NuGet Package 1.19.1 to this project. Other than that, I have a reference to the “Newtonsoft.Json” NuGet Package 10.0.3, as well as to a couple of &quot;Microsoft.Diagnostics.EventFlow.*&quot; NuGet Packages.

So far, everything compiles without any error.

But as soon as I hit my wrapper class – consumed from a simple Service Fabric Stateless Service (Full .NET Framework 4.6.1) – and try to execute the following line of code:

    _docClient = new DocumentClient(new Uri(cosmosDbEndpointUrl), cosmosDbAuthKey);

I get this strange error at runtime:

&gt; System.IO.FileNotFoundException occurred   HResult=0x80070002  
&gt; Message=Could not load file or assembly &#39;System.Net.Http,
&gt; Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&#39; or
&gt; one of its dependencies. The system cannot find the file specified.  
&gt; Source=&lt;Cannot evaluate the exception source&gt;   StackTrace:    at
&gt; Microsoft.Azure.Documents.Client.DocumentClient.Initialize(Uri
&gt; serviceEndpoint, ConnectionPolicy connectionPolicy, Nullable`1
&gt; desiredConsistencyLevel)    at
&gt; Microsoft.Azure.Documents.Client.DocumentClient..ctor(Uri
&gt; serviceEndpoint, String authKeyOrResourceToken, ConnectionPolicy
&gt; connectionPolicy, Nullable`1 desiredConsistencyLevel)
&gt; 
&gt; Inner Exception 1: FileNotFoundException: Could not load file or
&gt; assembly &#39;System.Net.Http, Version=4.0.0.0, Culture=neutral,
&gt; PublicKeyToken=b03f5f7f11d50a3a&#39; or one of its dependencies. The
&gt; system cannot find the file specified.

I have absolutely no clue, why the System.Net.Http assembly is not found at all – there is even a assembly reference in my class library project to the .Net Framework Assembly “System.Net.Http 4.0.0.0”.

What I also do not understand is, that there is this weird binding redirect to 4.2.0.0 – where is that one coming from?
To get around this one, I tried to add the following redirect to the app.config of the Service Fabric Service (which is consuming the class library):

  &lt;dependentAssembly&gt;
    &lt;assemblyIdentity name=&quot;System.Net.Http&quot; publicKeyToken=&quot;b03f5f7f11d50a3a&quot; culture=&quot;neutral&quot; /&gt;
    &lt;bindingRedirect oldVersion=&quot;0.0.0.0-4.2.0.0&quot; newVersion=&quot;4.0.0.0&quot; /&gt;
  &lt;/dependentAssembly&gt;

But still no difference, I still get the error at runtime.

Anybody having a clue? Anybody having seen such issue?

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Strange issue with System.Net.Http 4.2.0.0 not found