Xamarin Forms IOS Failed to load assembly System.Net.Http.Primitive

Question

I'm trying to do a release build for an IOS app using Xamarin.Forms in Visual Studio 2015.

Under the iOS Build menu in the properties of the app, If I set the Linker behaviour Link SDK assemblies only or Link all assemblies - I get the following build error:

Failed to resolve assembly: 'System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' BlackhawkPlatform.App.iOS

If I don't link any of the assemblies - the App builds fine but the output ipa is over 40mb big 0 uncompressed over 100mb and as such cannot be submitted to iTunes Connect.

I have the latest version installed of System.Net Client libraries and Xamarin Forms.

I have tried to skip the assembly link by using the command --linkskip=System.Net.Http.Primitives in the Additional mtouch argument box but that dos not work.

Any idea how I can get around this please?

TResponse · Accepted Answer · 2016-04-13 22:49:15Z

11

Found a solution which worked.

In Nuget package manager install the latest version of Microsoft.BCL.Build v1.0.21
then install the latest version of Microsoft.Net.Http v2.2.29

This worked for me.

edited Apr 13, 2016 at 22:49

answered Mar 10, 2016 at 20:57

TResponse

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4 Comments

The Senator Over a year ago

This progressed me to a next error which was 'Failed to create the a fat library. Please review the build log. (MT5306)' I'll see if I can gather more on this.

The Senator Over a year ago

I don't think it relates, but your answer seems to have got me further. Thanks.

TResponse Over a year ago

Hi, I have been finding issue where packages were not being unzipped properly. I ended up removing the packages from the packages.config file and deleting them from the folder then re install them. In some cases that worked as well. I think there are still a few issues to resolve around Xamarin deployments though.

The Senator Over a year ago

My other issue was nothing to do with this problem, so I can confirm your solution was correct. (My other issue was that I hadn't accepted my Xcode terms after an upgrade so it wouldn't deploy). Many hoops to jump through hey? Many thanks @loanburger

Jay Peterson · Accepted Answer · 2017-05-17 19:41:17Z

1

I know this is an old thread... but here is what I found missing in my ios.csproj file

<Reference Include="System.Net.Http.Extensions">
  <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\Xamarin.iOS10\System.Net.Http.Extensions.dll</HintPath>
</Reference>
<Reference Include="System.Net.Http.Primitives">
  <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\Xamarin.iOS10\System.Net.Http.Primitives.dll</HintPath>
</Reference>

answered May 17, 2017 at 19:41

Jay Peterson

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1 Comment

TResponse Over a year ago

Yes that's what "should" get added when the Nuget Package is installed.

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