在实体框架7 RC 1和ASP.NET MVC 6号种子的初始数据 [英] Seed initial data in Entity Framework 7 RC 1 and ASP.NET MVC 6

问题描述

看来，在实体框架7有种子数据没有原生支持，但（ https://github.com/ ASPNET /的EntityFramework /问题/ 629 ）。

It seems that in Entity Framework 7 there is no native support for seed data yet (https://github.com/aspnet/EntityFramework/issues/629).

有没有 DbMigrationsConfiguration 类，没有在微软提供的模板代码种子方法。

那么如何在ASP.NET种子数据MVC 6使用实体框架7 RC 1的web应用程序？

推荐答案

我找到了一个临时解决办法为自己。

I've found a temporary workaround for myself.

我们可以创建一个方法 SeedData ，它扩展了 IApplicationBuilder 然后通过的GetService 获取我们的数据库上下文类的一个实例方法并将其用于播种数据。

We can create a method SeedData that extends the IApplicationBuilder then gets an instance of our database context class through GetService method and uses it for seeding the data.

下面是我的扩展方法的样子：

Here is how my extension method looks like:

using Microsoft.AspNet.Builder;
using Microsoft.Extensions.DependencyInjection;

public static class DataSeeder
{
    // TODO: Move this code when seed data is implemented in EF 7

    /// <summary>
    /// This is a workaround for missing seed data functionality in EF 7.0-rc1
    /// More info: https://github.com/aspnet/EntityFramework/issues/629
    /// </summary>
    /// <param name="app">
    /// An instance that provides the mechanisms to get instance of the database context.
    /// </param>
    public static void SeedData(this IApplicationBuilder app)
    {
        var db = app.ApplicationServices.GetService<ApplicationDbContext>();

        // TODO: Add seed logic here

        db.SaveChanges();
    }
}

要使用它把应用.SeedData（）; 应用程序启动类的配置法线（位于在文件中的web项目名为 Startup.cs ）。

To use it put app.SeedData(); line in the Configure method of the application Startup class (located in the web project in file called Startup.cs).

// This method gets called by the runtime.
// Use this method to configure the HTTP request pipeline.
public void Configure(
    IApplicationBuilder app,
    IHostingEnvironment env,
    ILoggerFactory loggerFactory)
{
    app.SeedData();

    // Other configuration code
}

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