如何添加IDesignTimeDbContextFactory的实现以将迁移添加到.Net Core 2.0应用程序?

问题描述

我正在尝试从.NET Core 2.0 MVC应用程序的程序包管理器控制台中运行Add-Migration InitialCreate命令.在查看了所有可能的来源之后，仍然无法解决错误说明如下的问题:

I am trying to run Add-Migration InitialCreate command from package manager console from a .NET Core 2.0 MVC application. After looking at all possible sources still not able to resolve the issue with error description as :

PM> Add-Migration InitialCreate

Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

我的Program.cs如下:

My Program.cs looks like:

 public class Program
{
    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>()
            .UseApplicationInsights()
            .Build();

        host.Run();
    }

    public static IWebHost BuildWebHost(string[] args) =>
        new WebHostBuilder()
        .UseKestrel()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .UseIISIntegration()
        .UseStartup<Startup>()
        .Build();
}

还为

public class ToDoContextFactory : IDesignTimeDbContextFactory<MvcMovieContext>
{
    public MvcMovieContext CreateDbContext(string[] args)
    {
        var builder = new DbContextOptionsBuilder<MvcMovieContext>();
        builder.UseSqlServer("Server=(local);Database=MvcMovieContext;Trusted_Connection=True;MultipleActiveResultSets=true");
        return new MvcMovieContext(builder.Options);
    }
}

有人可以通过逐步描述性程序来帮助我，以便将模型和Entity Framework工具添加到.NET Core2.0 App中.

Can someone help me with a descriptive step by step procedure to add model and Entity Framework tools to a .NET Core2.0 App.

推荐答案

您需要更改课程Program

You need change your class Program

public class Program
{
    public static void Main(string[] args)
    {
        BuildWebHost(args).Run();
    }

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}

此类已更改使用dotnet core 2.0.0

This class changed with dotnet core 2.0.0

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