Question

我正在使用Asp.net MVC开发SPA。项目适用于localhost，但我在托管时遇到了问题。

有一个控制器可以与MembershipProvider一起使用很少的方法。

[InitializeSimpleMembership]
public class AccountController : ApiController
{
    public object Get()
    {
        ...
    }

    ...
}

关键时刻 - 是属性InitializeSimpleMembership。它的声明：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
{
    private static SimpleMembershipInitializer _initializer;
    private static object _initializerLock = new object();
    private static bool _isInitialized;

    public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        // Ensure ASP.NET Simple Membership is initialized only once per app start
        LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
    }

    private class SimpleMembershipInitializer
    {
        public SimpleMembershipInitializer()
        {
            Database.SetInitializer(new ITAInitializer());

            using (var context = new ITAContext())
            {
                if (!context.Database.Exists())
                {
                    ((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
                }
            }

            WebSecurity.InitializeDatabaseConnection("ITAContext", "Users", "ID", "Login", autoCreateTables: true);

            if (!Roles.RoleExists(UserRights.Admin.ToString()))
                Roles.CreateRole(UserRights.Admin.ToString());

            if (!Roles.RoleExists(UserRights.Moderator.ToString()))
                Roles.CreateRole(UserRights.Moderator.ToString());

            if (!Roles.RoleExists(UserRights.User.ToString()))
                Roles.CreateRole(UserRights.User.ToString());
        }
    }
}

当我在控制器中调用任何方法时，我收到错误：

数据库中已有一个名为“Users”的对象。

如果我正在删除表Users，那么首先请求正常运行并创建表。在接下来的电话中我再次收到错误。为什么它试图创建表而不使用现有的？

Answer 1

从控制器中删除此属性

在某个类中添加方法WebSecurity.InitializeDatabaseConnection：

public static class AuthConfig
{
    public static void RegisterAuth()
    {
        WebSecurity.InitializeDatabaseConnection("ITAContext", "Users", "ID", "Login", autoCreateTables: true);

        if (!Roles.RoleExists(UserRights.Admin.ToString()))
            Roles.CreateRole(UserRights.Admin.ToString());

        if (!Roles.RoleExists(UserRights.Moderator.ToString()))
            Roles.CreateRole(UserRights.Moderator.ToString());

        if (!Roles.RoleExists(UserRights.User.ToString()))
            Roles.CreateRole(UserRights.User.ToString());
    }
}

调用此方法：

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AuthConfig.RegisterAuth();
    }
}

Answer 2

问题在于db用户的权限。添加VIEW DEFINITION和ALTER后，我的代码运行正常。

SimpleMembership - 对象'用户'已存在

2 个答案: