问题
I installed a visual studio 2017 and I have created a MVC project called WebApplication1.
In the Dependencies-> NuGet I have the files
- Microsoft.AspNetCore.App(2.2.0)
- Microsoft.AspNetCore.Razor.Design(2.2.0).
In Dependencies->SDK:
- Microsoft.AspNetCore.App(2.2.0)
- Microsoft.NETCore.App (2.2.0)
I want to install Entity Framework Core for my project.
Thus I right click on my project and select "Manage Nuget Packages" and then in brows section I enter "Microsoft.EntityFrameworkCore.SqlServer" in the serch bar and choose it then install. However the console shows me two errors for installing:
Severity Code Description Project File Line Suppression State Error Package restore failed. Rolling back package changes for 'WebApplication1'. Error NU1107 Version conflict detected for Microsoft.EntityFrameworkCore. Install/reference Microsoft.EntityFrameworkCore 3.1.1 directly to project WebApplication1 to resolve this issue. WebApplication1 -> Microsoft.EntityFrameworkCore.SqlServer 3.1.1 -> Microsoft.EntityFrameworkCore.Relational 3.1.1 -> Microsoft.EntityFrameworkCore (>= 3.1.1) WebApplication1 -> Microsoft.AspNetCore.App 2.2.0 -> Microsoft.EntityFrameworkCore (>= 2.2.0 && < 2.3.0). WebApplication1 F:\Div\workspace\CSDDashboard.net project\WebApplication1\WebApplication1\WebApplication1.csproj 1
I have searched a lot on the internet to find any solution but till now I'm not successful. I appreciate if anyone could solve the issue.
回答1:
You have to select 2.2.0 version when installing the Microsoft.EntityFrameworkCore.SqlServer package
In Manage Nuget Packages window
Or use Package Manager Console:
Install-Package Microsoft.EntityFrameworkCore.SqlServer -Version 2.2.0
or add this line to your csproj file
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.2.0" />
来源：https://stackoverflow.com/questions/59825912/errornu1107version-conflict-detected-for-microsoft-entityframeworkcore-instal