c# - 从.NET Core 2.1降级到.NET 4.7.1时如何使用IApplicationBuilder和IServiceCollection？

Question

我必须将我的项目从 .NET Core 2.1 更改为 .NET 4.7.1，并且修复了几乎所有错误，除了以下仍然无法解决的错误

• 'IApplicationBuilder' does not contain a definition for 'UseHsts' and no extension method 'UseHsts' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IApplicationBuilder' does not contain a definition for 'UseAuthentication' and no extension method 'UseAuthentication' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IApplicationBuilder' does not contain a definition for 'UseCookiePolicy' and no extension method 'UseCookiePolicy' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IApplicationBuilder' does not contain a definition for 'UseHttpsRedirection' and no extension method 'UseHttpsRedirection' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IApplicationBuilder' does not contain a definition for 'UseSession' and no extension method 'UseSession' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IApplicationBuilder' does not contain a definition for 'UseStaticFiles' and no extension method 'UseStaticFiles' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

• 'IServiceCollection' does not contain a definition for 'AddAuthentication' and no extension method 'AddAuthentication' accepting a first argument of type 'IServiceCollection' could be found (are you missing a using directive or an assembly reference?)

• 'IServiceCollection' does not contain a definition for 'AddSession' and no extension method 'AddSession' accepting a first argument of type 'IServiceCollection' could be found (are you missing a using directive or an assembly reference?)

我正在使用 Microsoft.AspNetCore.Builder 和 Microsoft.Extensions.DependencyInjection。我还需要使用/安装/添加什么才能使 IApplicationBuilder 和 IServiceCollection 正常工作？

在我的 WebApi.csproj 文件中，我将目标框架从 netcoreapp2.1 更改为 net471。

旧:

<PropertyGroup>
  <TargetFramework>netcoreapp2.1</TargetFramework>
</PropertyGroup>

新:

<PropertyGroup>
  <TargetFramework>net471</TargetFramework>
</PropertyGroup>

Answer 1

按照 Rik 的回答，我搜索了更多包，发现我必须添加以下所有 NuGet 包:

• Microsoft.AspNetCore.Authentication
• Microsoft.AspNetCore.Session
• Microsoft.AspNetCore.HttpsPolicy
• Microsoft.AspNetCore.CookiePolicy
• Microsoft.AspNetCore.StaticFiles

执行此操作后，我不再收到错误消息。