entity-framework - 无法在 ASP.NET Core 项目中安装 Microsoft.EntityFrameworkCore

Question

以前这样做从来没有问题，但是今天，当我运行命令时 Install-Package Microsoft.EntityFrameworkCore ，以下错误确保:

NU1107: Version conflict detected for Microsoft.EntityFrameworkCore.Abstractions. Install/reference Microsoft.EntityFrameworkCore.Abstractions 2.2.1 directly to 
project WebApplication1 to resolve this issue. 
 WebApplication1 -> Microsoft.EntityFrameworkCore 2.2.1 -> Microsoft.EntityFrameworkCore.Abstractions (>= 2.2.1) 
 WebApplication1 -> Microsoft.AspNetCore.App 2.1.1 -> Microsoft.EntityFrameworkCore.Abstractions (>= 2.1.1 && < 2.2.0).
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package restore failed. Rolling back package changes for 'WebApplication1'.
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

真的不太确定如何解决它。

我尝试安装以前的版本无济于事: Install-Package Microsoft.EntityFrameworkCore -Version 2.1.0

Answer 1

我遇到了同样的问题，我刚刚安装了 EFCore 2.1.11。 EFCore 和 AspNetCore 似乎在版本中并存。