无法从程序集“Microsoft.AspNetCore.Hosting，版本=3.0.0.0"加载类型“上下文" [英] Could not load type 'Context' from assembly 'Microsoft.AspNetCore.Hosting, Version=3.0.0.0

问题描述

使用 .netcore 2.2 升级到 .netcore 3.0

Where using .netcore 2.2 an upgrade to .netcore 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，版本=3.0.0.0"中加载类型上下文"

"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:

1. 删除旧包

    <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" />

1. 安装

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

1. 更新 Startup.cs

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

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