为什么我不能通过 nuget 安装 Microsoft.VisualStudio.Web.CodeGeneration.Tools 2.0.1？ ASP.NET 核心 2.0.1

Question

我已添加对我的 project.csproj 文件的引用，如 S.O. 和 ms 文档 tutorial 所示：

<ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.1" />
  </ItemGroup>

运行dotnet restore 声称成功。但是找不到 dotnet aspnet-codegenerator 命令，并且在管理 nuget 包中，未安装 CodeGeneration.Tools 并且手动安装会出现错误： Package restore failed. Rolling back package changes for 'ContosoUniversity'.

---

这似乎是由于我不了解或不知道如何解决的版本兼容性问题。我已经在我的依赖项中安装了 Microsoft.NETCore.App 2.0.3 和 Microsoft.NETCore.APP 2.0.3，其他一切都是 2.0.1。 （CodeGeneration.Design、CodeGeneration.Utils 等...并在包管理控制台运行 Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Tools 抛出错误：

 GET https://api.nuget.org/v3/registration3-gz-semver2/microsoft.visualstudio.web.codegeneration.tools/index.json
  OK https://api.nuget.org/v3/registration3-gz-semver2/microsoft.visualstudio.web.codegeneration.tools/index.json 166ms
Restoring packages for C:\Users\sticker592\Documents\Visual Studio 2017\Projects\ContosoUniversity\ContosoUniversity\ContosoUniversity.csproj...
Install-Package : Detected package downgrade: Microsoft.NETCore.App from 2.0.3 to 2.0.0. Reference the package directly from the project to 
select a different version. 
 ContosoUniversity -> Microsoft.VisualStudio.Web.CodeGeneration.Tools 2.0.1 -> Microsoft.NETCore.App (>= 2.0.3) 
 ContosoUniversity -> Microsoft.NETCore.App (>= 2.0.0)
At line:1 char:1
+ Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Tools
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
 
Install-Package : Package restore failed. Rolling back package changes for 'ContosoUniversity'.
At line:1 char:1
+ Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Tools
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

---

将所有内容降级到 2.0.0 允许我在 Nuget 中安装 CodeGeneration.Tools 但我仍然收到错误：dotnet : No executable found matching command "dotnet-aspnet-codegenerator"

Answer 1

在 Nuget 包管理器中转到“管理 Nuget 包以获取解决方案”，然后

包内源 .

添加以下详细信息： 姓名 “nuget.org”

来源 "https://api.nuget.org/v3/index.json"

Answer 2

如果发生这种情况，解决该错误的方法是在项目文件夹目录中的 dos 命令提示符下运行命令，而不是在包管理器控制台中。然后你可以在没有错误的情况下搭建你的页面，直到 MS 修复了这个错误。

证明：

C:\Users\username\Documents\Visual Studio 2017\Projects\ContosoUniversity\ContosoUniversity>dotnet aspnet-codegenerator razorpage -m Student -dc SchoolContext -udl -outDir Pages\Students --referenceScriptLibraries
Building project ...
Finding the generator 'razorpage'...
Running the generator 'razorpage'...
Attempting to compile the application in memory.
Attempting to figure out the EntityFramework metadata for the model and DbContext: 'Student'
info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0]
      User profile is available. Using 'C:\Users\username\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest.
info: Microsoft.EntityFrameworkCore.Infrastructure[100403]
      Entity Framework Core 2.0.0-rtm-26452 initialized 'SchoolContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: None
Added Razor Page : \Pages\Students\Create.cshtml
Added PageModel : \Pages\Students\Create.cshtml.cs
Added Razor Page : \Pages\Students\Edit.cshtml
Added PageModel : \Pages\Students\Edit.cshtml.cs
Added Razor Page : \Pages\Students\Details.cshtml
Added PageModel : \Pages\Students\Details.cshtml.cs
Added Razor Page : \Pages\Students\Delete.cshtml
Added PageModel : \Pages\Students\Delete.cshtml.cs
Added Razor Page : \Pages\Students\Index.cshtml
Added PageModel : \Pages\Students\Index.cshtml.cs
RunTime 00:00:15.33