asp.net-mvc - 实体框架：为什么 SimpleMembership 寻找默认连接

Question

我已明确设置 AccountsContextmytestdb用作 SimpleMembership 的连接字符串，如下所示 -

public class AccountsContext : DbContext
{
    public AccountsContext()
        : base("mytestdb")
    {
    }
}

DefaultConnection但是由于某种原因，在以下代码行中初始化的数据库仍在寻找。虽然我已经DefaultConnection从 web.config 中完全删除了对的引用。

    public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
    {
        private static SimpleMembershipInitializer _initializer;
        private static object _initializerLock = new object();
        private static bool _isInitialized;

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            // Ensure ASP.NET Simple Membership is initialized only once per app start
            LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
        }
  }

这是带有注释部分的 Web.config 文件 -

  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <!--<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />-->
  </configSections>
  <connectionStrings>
    <add name="mytestdb" connectionString="Data Source=(local);Initial Catalog=mytestdb;User ID=****;Password=****" providerName="System.Data.SqlClient" />
    <!--<add name="DefaultConnection" 
         connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-LakshyaMvc-20130205074346;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-***.mdf" 
         providerName="System.Data.SqlClient" />-->
  </connectionStrings>

  <!--<entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>-->

在这方面的任何帮助都会很有帮助。

Answer 1

看一下文件SimpleMembershipInitializer里面的私有类~/Filters/InitializeSimpleMembershipAttribute.cs：

private class SimpleMembershipInitializer
{
    public SimpleMembershipInitializer()
    {
        Database.SetInitializer<UsersContext>(null);

        try
        {
            using (var context = new UsersContext())
            {
                if (!context.Database.Exists())
                {
                    // Create the SimpleMembership database without Entity Framework migration schema
                    ((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
                }
            }

            WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);
        }
        catch (Exception ex)
        {
            throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex);
        }
    }
}

您是否注意到以下行：

WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);

这就是它的来源。顺便说一句，如果您查看了您得到的异常堆栈跟踪，它会将您指向这个位置。

同样在~/Models/AccountModel.cs文件中，您可能默认定义了以下上下文：

public class UsersContext : DbContext
{
    public UsersContext()
        : base("DefaultConnection")
    {
    }

    public DbSet<UserProfile> UserProfiles { get; set; }
}