Question

我的Global.asax包含以下代码，

public class Global : System.Web.HttpApplication
    {
        private MetaModel _s_Model = new AdvancedMetaModel();
        public MetaModel s_Model
        {
            get
            {
                return _s_Model;
            }
        }

        private MetaModel _a_Model = new AdvancedMetaModel();
        public MetaModel a_Model
        {
            get
            {
                return _a_Model;
            }
        }

        public void RegisterRoutes(RouteCollection routes)
        {
            Dictionary<Helper.ModelName, MetaModel> registeredRoutes = new Dictionary<Helper.ModelName, MetaModel>();

            if (SQLAppModel.ModelQuery.GetUserType() == Utility.Helper.UserType.ApplicationAdmin
                || SQLAppModel.ModelQuery.GetUserType() == Utility.Helper.UserType.SystemAdmin)
            {
                _a_Model.RegisterContext(typeof(SQLAppModel.aEntities), new ContextConfiguration() { ScaffoldAllTables = true });

                /** Full Permission **/
                routes.Add(new DynamicDataRoute("{table}/ListDetails.aspx")
                {
                    Action = PageAction.List,
                    ViewName = "ListDetails",
                    Model = a_Model
                });

                routes.Add(new DynamicDataRoute("{table}/ListDetails.aspx")
                {
                    Action = PageAction.Details,
                    ViewName = "ListDetails",
                    Model = a_Model
                });

                registeredRoutes.Add(Helper.ModelName.Administration, a_Model);
            }

            string supportedEnvironments = System.Configuration.ConfigurationManager.AppSettings[Helper.SupportedEnvironmentsAppSettingsKey].ToString();

            foreach (string supportedEnvironment in supportedEnvironments.Split(','))
            {

                foreach (var supportedSystem in SQLAppModel.ModelQuery.GetSupportedSystems(supportedEnvironment, true))
                {
                    if (supportedEnvironment.ToUpper() == "ORACLE")
                    {
                        if (supportedSystem.Name.ToUpper() == "ADS")
                        {
                            _s_model.RegisterContext(typeof(OracleAppModel.sEntities), new ContextConfiguration()
                            {
                                ScaffoldAllTables = true
                            });

                            routes.Add(new DynamicDataRoute("{table}/ReadOnlyListDetails.aspx")
                            {
                                Action = PageAction.List,
                                ViewName = "ReadOnlyListDetails",
                                Model = s_model
                            });

                            routes.Add(new DynamicDataRoute("{table}/ReadOnlyListDetails.aspx")
                            {
                                Action = PageAction.Details,
                                ViewName = "ReadOnlyListDetails",
                                Model = s_model
                            });
                            registeredRoutes.Add(Helper.ModelName.ADS, s_model);
                        }
                    }
                }

            HttpContext.Current.Session[Helper.RegisteredRouteListSessionKey] = registeredRoutes;
        }

        void Application_Start(object sender, EventArgs e)
        {

        }

        void Session_Start(object sender, EventArgs e)
        {
            SQLAppModel.ModelQuery.GetApplicationUser();
            RegisterRoutes(RouteTable.Routes);
        }
    }

当我第一次使用ASP.NET开发Web服务器调试我的应用程序时，应用程序运行正常并提供所需的结果。

但是当我停止调试并再次启动它时，它给出了以下异常，

项目已添加。键入字典：添加'APP.SQLAppModel.sEntities'键：'APP.SQLAppModel.sEntities'

抛出此异常的行是_a_Model.RegisterContext（typeof（SQLAppModel.aEntities），new ContextConfiguration（）{ScaffoldAllTables = true}）;

完成堆栈跟踪：

[ArgumentException：Item已被添加。键入字典：添加'APP.SQLAppModel.sEntities'键：'APP.SQLAppModel.sEntities'] System.Collections.Hashtable.Insert（Object key，Object nvalue，Boolean add）+9352427 System.Collections.Hashtable.Add（Object key，Object value）+11 System.Web.DynamicData.MetaModelManager.AddModel（类型contextType，MetaModel模型）+96 System.Web.DynamicData.MetaModel.RegisterContext（DataModelProvider dataModelProvider，ContextConfiguration configuration）+727 System.Web.DynamicData.MetaModel.RegisterContext（Func`1 contextFactory，ContextConfiguration配置）+390 System.Web.DynamicData.MetaModel.RegisterContext（类型contextType，ContextConfiguration配置）+88 在C：\ Anand \ SAMI \ SAMI \ SAMI \ Global.asax.cs中的SAMI.Global.RegisterRoutes（RouteCollection路由）：42 SAMI.Global.Session_Start（对象发送者，EventArgs e）在C：\ Anand \ SAMI \ SAMI \ SAMI \ Global.asax.cs：137 System.Web.SessionState.SessionStateModule.RaiseOnStart（EventArgs e）+8955827 System.Web.SessionState.SessionStateModule.CompleteAcquireState（）+148 System.Web.SessionState.SessionStateModule.BeginAcquireState（Object source，EventArgs e，AsyncCallback cb，Object extraData）+561 System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+96 System.Web.HttpApplication.ExecuteStep（IExecutionStep step，Boolean＆amp; completedSynchronously）+184

请让我知道如何解决这个问题。我很难确定问题。

Answer 1

问题是你从Session_Start调用RegisterRoutes，因此可以多次调用它。您需要从Application_Start调用它。

例外情况“项目已添加。”在MetaModel.Register中

1 个答案: