.NET Core 2.0新项目无法识别已安装的AspNetCore.Http.Extensions包

Hey Diego, I’ve run into similar NuGet package scope issues before—let’s walk through how to get your new projects recognizing that namespace properly:

• Verify you’re installing the package to the new project
  When you run PM> Install-Package AspNetCore.Http.Extensions -Version 1.0.0 in the Package Manager Console, it only installs the package to the currently selected project in the console’s dropdown. If you added a new project after the initial install, you need to target it explicitly:

  PM> Install-Package AspNetCore.Http.Extensions -Version 1.0.0 -ProjectName YourNewProjectName
  

  Replace YourNewProjectName with the exact name of your newly added project.

• Check the new project’s target framework
  Make sure your new project is targeting a framework compatible with AspNetCore.Http.Extensions 1.0.0. For .NET Core 2.0 solutions:

  • Console projects should target netcoreapp2.0
  • Class libraries should target netstandard2.0
    You can confirm this by right-clicking the project → Properties → Application → Target Framework.

• Manually add the package reference if needed
  If the install command still isn’t working, open your new project’s .csproj file and add this line inside the <ItemGroup> section that contains other package references:

  <PackageReference Include="AspNetCore.Http.Extensions" Version="1.0.0" />
  

  Save the file, then right-click the project → Reload Project.

• Clean and restore NuGet packages
  Sometimes cached package data causes recognition issues. Try these steps:

  1. Right-click your solution → Clean Solution
  2. Right-click your solution → Restore NuGet Packages
  3. Rebuild the entire solution

If you run into a specific error message when re-running the install command, feel free to share it and we can narrow things down further!

内容的提问来源于stack exchange，提问作者Diego