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TableNotEnabledForNotificationException Class

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)

<SerializableAttribute> _
Public NotInheritable Class TableNotEnabledForNotificationException _
	Inherits SystemException

The TableNotEnabledForNotificationException type exposes the following members.

Public methodTableNotEnabledForNotificationExceptionInitializes a new instance of the TableNotEnabledForNotificationException class.
Public methodTableNotEnabledForNotificationException(String)Initializes a new instance of the TableNotEnabledForNotificationException class with the specified error message.
Public methodTableNotEnabledForNotificationException(String, Exception)Initializes a new instance of the TableNotEnabledForNotificationException class with a specified error message and a reference to the inner exception that is the cause of this exception.

Public propertyDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertyHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public propertyHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertyInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertyMessageGets a message that describes the current exception. (Inherited from Exception.)
Public propertySourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertyStackTraceGets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
Public propertyTargetSiteGets the method that throws the current exception. (Inherited from Exception.)

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetObjectDataWhen overridden in a derived class, sets the SerializationInfo with information about the exception. (Inherited from Exception.)
Public methodGetTypeGets the runtime type of the current instance. (Inherited from Exception.)
Public methodToStringCreates and returns a string representation of the current exception. (Inherited from Exception.)

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.
         ' 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

         ' 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
         End Try

      ' Handle the TableNotEnabledForNotificationException with
            ' a call to the SqlCacheDependencyAdmin.EnableTableForNotifications method.
      Catch exTabDis As TableNotEnabledForNotificationException
            SqlCacheDependencyAdmin.EnableTableForNotifications( _
             "Northwind", "Categories")

         ' If a SqlException is thrown, redirect to an error page.
         Catch exc As SqlException
         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.
         Cache.Insert("SqlSource", Source1, SqlDep)
            CacheMsg.Text = "The data object was created explicitly."

      End Try

       CacheMsg.Text = "The data was retrieved from the Cache."
    End If
End Sub

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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