Question

我正在尝试在ASP.NET项目中使用显式事务。调试时，只要达到使用行（var transaction = ...）抛出以下异常：

“没有为'Microsoft.Data.Entity.Storage.IRelationalConnection'类型的服务注册”

我在下面列出了我的依赖项。我在启动文件中遗漏了什么吗？

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

        }

我的依赖项：

"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" }

由于

Answer 1

您收到此错误，因为ApplicationDbContext尚未配置为使用特定提供程序。有几种方法可以将DbContext配置为指向您的数据库，如EF Core官方文档中Configuring a DbContext中所述。

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，

// 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>())
....

Asp.net 5 Entity Framework 7.0.0-rc1-final显式事务错误

1 个答案: