Question

我刚刚安装了VS2017 Enterprise，试图创建空白的UWP项目。然后我添加了一个派生自DbContext

的类

using Microsoft.EntityFrameworkCore;

namespace Test
{
    public class TestContext : DbContext
    {
    }
}

编译器不喜欢上面的简单类并且抱怨：

Severity    Code    Description Project File    Line    Suppression State
Error   CS0234  The type or namespace name 'EntityFrameworkCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)

虽然我确实安装了sqlite包

Install-Package Microsoft.EntityFrameworkCore.Sqlite

安装成功。

我错过了什么？也许我需要添加一个DLL的引用，但我应该使用哪个DLL？

更新我尝试按照建议安装Microsoft.EntityFrameworkCore（主程序包），但它似乎不兼容。

supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-arm. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-arm-aot. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-x64. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-x64-aot. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-x86. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Install-Package : Package Microsoft.EntityFrameworkCore 2.0.1 is not compatible with uap10.0.10240 (UAP,Version=v10.0.10240) / win10-x86-aot. Package 
Microsoft.EntityFrameworkCore 2.0.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
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 'TestEntityFW'.
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Answer 1

您还必须安装EF Core的主程序包

Install-Package Microsoft.EntityFrameworkCore

Microsoft.EntityFrameworkCore.Sqlite只是Entity Framework Core的数据库提供程序包，例如Microsoft.EntityFrameworkCore.SqlServer。

EntityFrameworkCore不存在 - VS2017 - UWP

1 个答案: