我在这里关注EntityFrameworkCore的教程
https://docs.efproject.net/en/staging/platforms/aspnetcore/new-db.html
但是当我到达教程的创建数据库部分时
https://docs.efproject.net/en/staging/platforms/aspnetcore/new-db.html#create-your-database
并运行命令Add-Migration MyFirstMigration我收到以下错误：
https://docs.efproject.net/en/staging/platforms/aspnetcore/new-db.html
但是当我到达教程的创建数据库部分时
https://docs.efproject.net/en/staging/platforms/aspnetcore/new-db.html#create-your-database
并运行命令Add-Migration MyFirstMigration我收到以下错误：
Cannot execute this command because Microsoft.EntityFrameworkCore.Design is not installed. Install the version of that package that matches the installed version of Microsoft.EntityFrameworkCore and try again.
我尝试安装Microsoft.EntityFrameworkCore.Design以及Microsoft.EntityFrameworkCore.sqlServer.Design NuGet上的每个版本但仍然得到相同的错误.
我还尝试使用该命令在NuGet PM之外运行
> dotnet恢复
> dotnet ef迁移添加MyFirstMigration
并得到以下错误：
Unhandled Exception: System.MissingMethodException: Entry point not found in assembly 'Microsoft.EntityFrameworkCore.Design,Version=1.1.0.0,Culture=neutral,PublicKeyToken=adb9793829ddae60'.
我尝试了所有我能想到的东西,并在互联网上到处寻找,但仍然没有找到答案.
解决方法
检查您的project.json是否包含这些条目
在依赖项下：
"Microsoft.EntityFrameworkCore.Design": {
"version": "1.0.0-preview2-final","type": "build"
},"Microsoft.EntityFrameworkCore.sqlServer": "1.0.1",
在工具下：
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview2-final","imports": [
"portable-net45+win8+dnxcore50","portable-net45+win8"
]
},
