Asp.net 5 Entity Framework的7.0.0-RC1决赛明确的交易错误 [英] Asp.net 5 Entity Framework 7.0.0-rc1-final explicit transaction error

问题描述

我想在ASP.NET项目中使用显式事务。调试时，只要与使用（VAR交易行= ...到达
以下异常被抛出：

I am trying to use an explicit transaction in an ASP.NET project. When debugging, as soon as the line with the using( var transaction = ... is reached the following exception is thrown:

没有服务类型Micr​​osoft.Data.Entity.Storage.IRelationalConnection已注册

"No service for type 'Microsoft.Data.Entity.Storage.IRelationalConnection' has been registered"

我已经包含下面我的依赖关系。我失去了我的启动文件的东西吗？

I have included my dependencies below. Am I missing something in my Startup file?

 using (ApplicationDbContext context = new ApplicationDbContext())
        {
            try
            {
                using (var transaction = context.Database.BeginTransaction())
                {
                   //do some work
                }
            }
            catch (Exception exc) { }

        }

我的依赖关系：

"dependencies": {
"EntityFramework.Commands": "7.0.0-rc1-final",
"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
"Microsoft.AspNet.Authentication.Cookies": "1.0.0-rc1-final",
"Microsoft.AspNet.Diagnostics.Entity": "7.0.0-rc1-final",
"Microsoft.AspNet.Identity.EntityFramework": "3.0.0-rc1-final",
"Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
"Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
"Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
"Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
"Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
"Microsoft.AspNet.Tooling.Razor": "1.0.0-rc1-final",
"Microsoft.Extensions.CodeGenerators.Mvc": "1.0.0-rc1-final",
"Microsoft.Extensions.Configuration.FileProviderExtensions": "1.0.0-rc1-final",
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
"Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc1-final" }

感谢

推荐答案

由于ApplicationDbContext尚未配置为使用特定的提供者，您收到此错误。有几种方法来配置你的DbContext指向你的数据库，如在配置EF Core的官方文档中创建的DbContext 。

You are getting this error because ApplicationDbContext has not been configured to use a specific provider. There are several ways to configure your DbContext to point to your database, as explained in Configuring a DbContext on EF Core's official docs.

例如，

public class ApplicationDbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder options)
    {
         options.UseSqlite("Filename=./test.db");
    }
}

或者，如果你想使用依赖注入，

Or if you want to use dependency injection,

// in Startup.cs
services.AddEntityFramework()
  .AddSqlite()
  .AddDbContext<ApplicationDbContext>(options =>
      options.UseSqlite("Filename=./test.db"));

// in a constructor argument
public HomeController(ApplicationDbContext context)
...

// in code

using(var context = serviceProvider.GetRequiredService<ApplicationDbContext>())
....

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