TableNotEnabledForNotificationException Class
.NET Framework 3.0
The exception that is thrown when a SqlCacheDependency class is used against a database table that is not enabled for change notifications.
Namespace: System.Web.Caching
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
[SerializableAttribute] public ref class TableNotEnabledForNotificationException sealed : public SystemException
/** @attribute SerializableAttribute() */ public final class TableNotEnabledForNotificationException extends SystemException
SerializableAttribute public final class TableNotEnabledForNotificationException extends SystemException
Not applicable.
The following code example attempts to create a SqlCacheDependency object and add an item to the Cache with a dependency on the SqlCacheDependency object. If the SQL Server database table is not enabled for dependency notifications, the TableNotEnabledForNotificationException is thrown and handled by calling the SqlCacheDependencyAdmin.EnableTableForNotifications method.
Sub Page_Load(Src As Object, E As EventArgs) ' Declare the SqlCacheDependency instance, SqlDep. Dim SqlDep As SqlCacheDependency ' Check the Cache for the SqlSource key. ' If it isn't there, create it with a dependency ' on a SQL Server table using the SqlCacheDependency class. If Cache("SqlSource") Is Nothing ' Because of possible exceptions thrown when this ' code runs, use Try...Catch...Finally syntax. Try ' Instantiate SqlDep using the SqlCacheDependency constructor. SqlDep = New SqlCacheDependency("Northwind", "Categories") ' Handle the DatabaseNotEnabledForNotificationException with ' a call to the SqlCacheDependencyAdmin.EnableNotifications method. Catch exDBDis As DatabaseNotEnabledForNotificationException Try SqlCacheDependencyAdmin.EnableNotifications("Northwind") ' If the database does not have permissions set for creating tables, ' the UnauthorizedAccessException is thrown. Handle it by redirecting ' to an error page. Catch exPerm As UnauthorizedAccessException Response.Redirect(".\ErrorPage.htm") End Try ' Handle the TableNotEnabledForNotificationException with ' a call to the SqlCacheDependencyAdmin.EnableTableForNotifications method. Catch exTabDis As TableNotEnabledForNotificationException Try SqlCacheDependencyAdmin.EnableTableForNotifications( _ "Northwind", "Categories") ' If a SqlException is thrown, redirect to an error page. Catch exc As SqlException Response.Redirect(".\ErrorPage.htm") End Try ' If all the other code is successful, add MySource to the Cache ' with a dependency on SqlDep. If the Categories table changes, ' MySource will be removed from the Cache. Then generate a message ' that the data is newly created and added to the cache. Finally Cache.Insert("SqlSource", Source1, SqlDep) CacheMsg.Text = "The data object was created explicitly." End Try Else CacheMsg.Text = "The data was retrieved from the Cache." End If End Sub
- AspNetHostingPermission for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
System.Object
System.Exception
System.SystemException
System.Web.Caching.TableNotEnabledForNotificationException
System.Exception
System.SystemException
System.Web.Caching.TableNotEnabledForNotificationException
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