EF Core Scaffold DbContext

Question

我遇到脚手架问题DbContext。我正在使用最新的.NET Core 1.1.0 SDK，我遵循本指南：https://docs.microsoft.com/en-us/ef/core/get-started/aspnetcore/existing-db

但是，当我在程序包管理器控制台中运行以下命令时：Scaffold-DbContext "<connection-string>" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models我收到异常。

project.json

"dependencies": { 
    "Microsoft.EntityFrameworkCore": "1.1.0", 
    "Microsoft.EntityFrameworkCore.Design": "1.1.0", 
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0", 
    "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0", 
    "Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final", 
    "NETStandard.Library": "1.6.1" 
    }, 

    "tools": { 
    "Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final" 
    }, 

    "frameworks": { 
    "netstandard1.6": { 
     "imports": [ 
     "dnxcore50" 
     ] 
    } 
    } 

异常

System.IO.FileNotFoundException: Could not load file or assembly 
'System.Data.SqlClient, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. 
File name: 'System.Data.SqlClient, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.SqlServerDatabaseModelFactory.Create(String connectionString, TableSelectionSet tableSelectionSet) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.Create(String connectionString, TableSelectionSet tableSelectionSet) 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.SqlServerScaffoldingModelFactory.Create(String connectionString, TableSelectionSet tableSelectionSet) 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineeringGenerator.GetMetadataModel(ReverseEngineeringConfiguration configuration) 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineeringGenerator.GenerateAsync(ReverseEngineeringConfiguration configuration, CancellationToken cancellationToken) 
    at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContextAsync(String provider, String connectionString, String outputDir, String dbContextClassName, IEnumerable`1 schemas, IEnumerable`1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, CancellationToken cancellationToken) 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.<ScaffoldContextImpl>d__22.MoveNext() 
    at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source, Int32& length) 
    at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source) 
    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass4_0`1.<Execute>b__0() 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) 
Could not load file or assembly 'System.Data.SqlClient, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. 

Answer 1

这个目前的解决方法是在被配置为启动项目解决方案中的一个可执行的项目执行脚手架。