Error when loading assembly: Could not load type 'System.Net.Http.HttpContent' from assembly

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Posted on by Marcos

I'm trying to access SharePoint using a simple HttpClient from using System.Net.Http;
The project builds but the assembly doesn't load on on Plugin Registration Tool. And I see this error:

Unhandled Exception: System.TypeLoadException: Could not load type 'System.Net.Http.HttpContent' from assembly 'CrmVSSolution.Workflows, Version=1.3.0.0, Culture=neutral, PublicKeyToken=dc437796e33d376f' because the method 'get_Headers' has no implementation (no RVA).
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at Microsoft.Crm.Tools.Libraries.CrmAssemblyReader.RetrievePluginsFromAssembly(String path)
at Microsoft.Crm.Tools.Libraries.CrmAssemblyReader.RetrievePluginsFromAssembly(String path)
at Microsoft.Crm.Tools.Libraries.RegistrationHelper.RetrievePluginsFromAssembly(String pathToAssembly, String appPath)
at Microsoft.Crm.Tools.AssemblyRegistration.PluginRegistrationViewModel.BtnLoadAssemblyClicked()

My project file includes these lines.

<Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\..\..\..\..\..\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Net.Http.dll</HintPath>
</Reference>

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Verified answer

Marcos 31 on at

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Error when loading assembly: Could not load type 'System.Net.Http.HttpContent' from assembly

Thanks, Sachin, this kind of works. After many tries I found out that I need to set the Nuget package version to 4.0.
Probably not the most advised solution, since the package is tagged as vulnerable, but it works.

If anyone has another suggestion, I'd happily hear it.
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Sachin Jadhav 131 on at

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Error when loading assembly: Could not load type 'System.Net.Http.HttpContent' from assembly

Are you adding the direct reference to the assembly "System.Net.Http"?

May be you can give this a try

1. From your project references list remove the reference to "System.net.Http" by right clicking and using Remove option

2. Install the nuget package named "system.net.http"

Here are steps to understand how to add nuget package: https://learn.microsoft.com/en-us/nuget/quickstart/install-and-use-a-package-in-visual-studio

Here is the package you are installing: https://www.nuget.org/Packages/system.net.http

3. Build your project and then try to register