无法从程序集'Microsoft.AspNetCore.Hosting，Version = 3.0.0.0加载类型'Context'

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在使用core 2.2 的情况下，升级到core 3.0

Where using core 2.2 an upgrade to core 3.0

这是我们在运行单元测试时遇到的错误:

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

无法从程序集'Microsoft.AspNetCore.Hosting，Version = 3.0.0.0中加载类型'Context'"

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

推荐答案

这些步骤适用于我们的项目:

These steps work on our project:

删除旧软件包

<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" />

安装

Microsoft.AspNetCore.Mvc.Testing 3.0.0-preview7.19365.7

更新Startup.cs

.AddApplicationPart(Assembly.Load("YourProjectControllerNamespace"))