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.net-coreupgradepreview

Could not load type 'Context' from assembly 'Microsoft.AspNetCore.Hosting, Version=3.0.0.0

Where using .netcore 2.2 an upgrade to .netcore 3.0

This is the error that we encounter when running unit test:

"Could not load type 'Context' from assembly 'Microsoft.AspNetCore.Hosting, Version=3.0.0.0"

Solution

  • These steps work on our project:

    1. Remove old packages
        <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Cors" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
    1. Install 
        Microsoft.AspNetCore.Mvc.Testing 3.0.0-preview7.19365.7
    1. Update Startup.cs
        .AddApplicationPart(Assembly.Load("YourProjectControllerNamespace"))