ASP.NET 5多的DbContext问题 [英] ASP.NET 5 multiple dbcontext problems

问题描述

我的新ASP.NET 5测试版8玩耍，并有麻烦的时候，我有两个的DbContext。

I'm playing around with the new ASP.NET 5 beta 8 and having trouble when I have two dbcontext.

我有以下的项目结构。

I have the following project structure.

-Data(Identity 3 db with other entities)
-Resources (Contains a db with translations)
-WebApp 

剥夺一些code在Startup.cs在Web应用程序

Stripped away some code in Startup.cs in WebApp

 public void ConfigureServices(IServiceCollection services)
 {
        services.AddEntityFramework()
            .AddSqlServer()
            .AddDbContext<DatabaseContext>(opt => opt.UseSqlServer(Configuration["Data:MainDb:ConnectionString"]));

        services.AddIdentity<ApplicationUser, IdentityRole>()
            .AddEntityFrameworkStores<DatabaseContext>()
            .AddDefaultTokenProviders();

        services.AddEntityFramework()
            .AddSqlServer()
            .AddDbContext<ResourceDbContext>(opt => opt.UseSqlServer(Configuration["Data:Resources:ConnectionString"]));

        services.AddTransient<IResourceDbContext, ResourceDbContext>();
        services.AddTransient<IDatabaseContext, DatabaseContext>();
}

在这两个ResourceDbContext和DatabaseContext我做以下

In both ResourceDbContext and DatabaseContext I do the following

    public ResourceDbContext(DbContextOptions options) : base(options)
    {
        _connectionString = ((SqlServerOptionsExtension)options.Extensions.First()).ConnectionString;
    }


    protected override void OnConfiguring(DbContextOptionsBuilder options)
    {
        options.UseSqlServer(_connectionString);
    }

然而，当我从appsettings.json阅读我的ConnectionStrings我收到ConfigureServices正确的价值观。但DbContextOptions仅包含最新加载的值，在这种情况下，对于资源的ConnectionString。所以，这两个的DbContext建立与资源数据库的连接。

However when I read my connectionstrings from appsettings.json I receive the correct values in ConfigureServices. But the DbContextOptions only contains the latest loaded value, in this case the connectionstring for Resources. So both dbcontext establishes a connection to Resource db.

我无法找到有关此的任何信息。

I'm unable to find any information about this.

推荐答案

所有你需要做的是表明DbContextOptions是一个泛型类型：

All you need to do is indicate that DbContextOptions is a generic type:

public ResourceDbContext(DbContextOptions<ResourceDbContext> options) : base(options)
{

}

现在依赖注入系统能够找到合适的依赖（ DbContextOptions选项），目前它创建ResourceDbContext并将其注入到构造。

Now the dependency injection system can find the right dependency (DbContextOptions options) at the moment it creates ResourceDbContext and injects it into the constructor.

<一个href=\"https://github.com/aspnet/EntityFramework/blob/master/src/EntityFramework.Core/Infrastructure/EntityFrameworkServicesBuilder.cs#L68-L77\"相对=nofollow>见实施AddDbContext方法

有关米罗斯拉夫Siska：

For Miroslav Siska:

public class GetHabitsIdentity: IdentityDbContext<GetHabitsUser, IdentityRole, string> where TUser : IdentityUser
{
    public GetHabitsIdentity(DbContextOptions<GetHabitsIdentity> options)
        :base(options)
    {

    }        
}

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