安装以下软件包后:
"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0"
,
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
(-Pre)
运行add-migration "InitialCreate"
命令时,出现以下错误:
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.
但是,如果你查看下面的.json
文件,你会发现这些包是匹配的,所以这个错误信息对我来说是矛盾的。
这是我的project.json
文件:
{
"runtimes": {
"win10-x64": {}
},
"dependencies": {
"Microsoft.AspNetCore.Diagnostics": "1.1.0",
"Microsoft.AspNetCore.Mvc": "1.1.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
"Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
"Microsoft.AspNetCore.StaticFiles": "1.1.0",
"Microsoft.EntityFrameworkCore": "1.1.0",
"Microsoft.EntityFrameworkCore.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final",
"Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
"Microsoft.Extensions.Configuration.Json": "1.1.0",
"Microsoft.Extensions.Logging.Console": "1.1.0",
"Microsoft.NETCore.App": "1.1.0"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
答案 0 :(得分:2)
您需要更改project.json
,如下所示。
注意:需要包含"type": "platform"
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.1",
"type": "platform"
}
}
}
您可以在此处详细了解此问题:GitHub
答案 1 :(得分:1)
如果您的解决方案中有多个项目。 使用-projectname选择正确的项目,如下所示
add-migration InitialCreate -ProjectName mydbProject
将mydbProject替换为您的项目名称