卡在 asp.net 核心教程中。 尝试使用 package 管理器控制台添加 EF Core SQL 服务器提供程序不起作用

Question

I am following this beginners tutorial on Microsoft's site.

At this step...

In the PMC, run the following command:
Install-Package Microsoft.EntityFrameworkCore.SqlServer

When I enter that command I get these messages and errors..

PM> Install-Package Microsoft.EntityFrameworkCore.SqlServer
Restoring packages for C:\projects\LazerbaseASPNET\LazerbaseASPNET\LazerbaseASPNET.csproj...
  GET https://api.nuget.org/v3-flatcontainer/microsoft.entityframeworkcore.sqlserver/index.json
  OK https://api.nuget.org/v3-flatcontainer/microsoft.entityframeworkcore.sqlserver/index.json 208ms
  GET https://api.nuget.org/v3-flatcontainer/microsoft.entityframeworkcore.sqlserver/6.0.7/microsoft.entityframeworkcore.sqlserver.6.0.7.nupkg
  OK https://api.nuget.org/v3-flatcontainer/microsoft.entityframeworkcore.sqlserver/6.0.7/microsoft.entityframeworkcore.sqlserver.6.0.7.nupkg 71ms
Installed Microsoft.EntityFrameworkCore.SqlServer 6.0.7 from https://api.nuget.org/v3/index.json with content hash D9YV3hc3VSN1qrfdrZcKtMcRLT6bUqj8KtaUdkmO1CH/+meL+8z3Rge5iPhwQ4ol2AwPQlQYVPTTajf9ulSFGg==.
Install-Package : NU1202: Package Microsoft.EntityFrameworkCore.SqlServer 6.0.7 is not compatible with netcoreapp3.1 (.NETCoreApp,Version=v3.1). Package 
Microsoft.EntityFrameworkCore.SqlServer 6.0.7 supports: net6.0 (.NETCoreApp,Version=v6.0)
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore.SqlServer
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
 
Install-Package : Package restore failed. Rolling back package changes for 'LazerbaseASPNET'.
At line:1 char:1
+ Install-Package Microsoft.EntityFrameworkCore.SqlServer
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
 
Time Elapsed: 00:00:03.2286177

Seems the important one is this...

Package Microsoft.EntityFrameworkCore.SqlServer 6.0.7 is not compatible with netcoreapp3.1 (.NETCoreApp,Version=v3.1). Package 
Microsoft.EntityFrameworkCore.SqlServer 6.0.7 supports: net6.0 

This tutorial is for asp.net core 3.1.. It seems to be the one they recommend for beginners also. I am at a impass and have no idea how to proceed.

EDIT: I think this is cus I used Visual Studio 2019 which I already had installed for Unity.. asp.net core 3.1 was the only option available for a new project... I think I need to wipe the existing server from azure, download Visual Studio 2022 and start again with a asp.net core 6 app?

Answer 1

You can try to install entity framework core through the nuget package manager. Rightclick on your project -> Manage Nuget packages. Before installing select the correct version from the dropdown for the netcore app version you are running.

Answer 2

I think this is cus I used Visual Studio 2019 which I already had installed for Unity.. asp.net core 3.1 was the only option available for a new project. The solution is wipe the existing server from azure, download Visual Studio 2022 and start again with a asp.net core 6 app. FML.

I also want to point out that this tutorial is wrong. Earlier in it it says requirement is Visual Studio 2019 16.4 or later.

I did read this and checked the version of Visual studio I had installed, I met the requirements so I kept going.