Cannot load System.Net.Http.Primitives in Xamarin iOS

Question

I have an older Xamarin forms project that I've updated, that uses Microsoft Azure's Mobile App Services (previously used Azure Mobile Services).

Was working fine, but after a clean and rebuild I now get this error whenever attempting to run it (I'm using Xamarin Studio)

Could not load file or assembly 'System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.

Microsoft.Azure.Mobile.Client and SQLiteStore are at version 2.0.1. I've tried removing and readding the assembly via NuGet, without any luck.

Has anyone seen this issue or resolved it?

I did - however both Microsoft.BCL.Build 1.0.21 and Microsoft.Net.Http 2.2.29 are already in the project, and I still have an error that Error CS0012 The type 'HttpMessageHandler' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Net.Http, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. — Mathieson
– Mathieson, Commented Jun 26, 2016 at 4:07

Community · Accepted Answer · 2017-05-23 12:22:30Z

2

Xamarin iOS (monotouch) depends on System.Net.Http.Primitives version 4.2.29.0, while version 1.5.0.0 is for platform portable-net40+sl4+win8+wp71+wpa81. As Eric Hedstrom commented, have you tried the steps from this answer?

edited May 23, 2017 at 12:22

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answered Jun 23, 2016 at 0:53

Di Hei

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2 Comments

Mathieson Over a year ago

I had, but was still getting errors. However I believe I found a workaround below.

Mathieson Over a year ago

Update - looks like the workaround does not. I've added both Microsoft.Bcl.Build 1.0.21 and Microsoft.Net.Http, however still get an error that The type

System.Net.Http.HttpClientHandler' is defined in an assembly that is not referenced. Consider adding a reference to assembly

System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' (CS0012) Checking to see if it's a conflict with ModernHttpHandler.

Mathieson · Accepted Answer · 2016-07-03 03:35:20Z

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Solution here wound up being recreating the Xamarin projects, and relinking the portable class library of the old project to it.

answered Jul 3, 2016 at 3:35

Mathieson

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Comments

Marek · Accepted Answer · 2017-06-06 20:21:09Z

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I faced a similar error in my solution with Xamarin.iOS native project which is using ModernHttpHandler.

Try adding a reference to standard Mono System.Net.Http in csproj file:

<Reference Include="System.Net.Http" />

For more details take a look at this blog post.

answered Jun 6, 2017 at 20:21

Marek

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