TableNotEnabledForNotificationException 類別

定義

命名空間:

System.Web.Caching

組件:

System.Web.dll

對沒有啟用變更告知的資料庫資料表使用 SqlCacheDependency 類別時，所擲回的例外狀況。

public ref class TableNotEnabledForNotificationException sealed : SystemException

[System.Serializable]
public sealed class TableNotEnabledForNotificationException : SystemException

[<System.Serializable>]
type TableNotEnabledForNotificationException = class
    inherit SystemException

Public NotInheritable Class TableNotEnabledForNotificationException
Inherits SystemException

繼承

Object

Exception

SystemException

TableNotEnabledForNotificationException

屬性

SerializableAttribute

範例

下列程式碼範例會嘗試建立 SqlCacheDependency 物件，並使用 物件的相依性 SqlCacheDependency 將專案新增至 Cache 。 如果未針對相依性通知啟用SQL Server資料庫資料表，則會 TableNotEnabledForNotificationException 藉由呼叫 SqlCacheDependencyAdmin.EnableTableForNotifications 方法來擲回和處理 。

public void Page_Load(object Src, EventArgs E) 
{ 
    // Declare the SqlCacheDependency instance, SqlDep. 
    SqlCacheDependency SqlDep = null; 
    
    // 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"] == null) { 
        
        // 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 (DatabaseNotEnabledForNotificationException exDBDis) { 
            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 (UnauthorizedAccessException exPerm) { 
                Response.Redirect(".\\ErrorPage.htm"); 
            } 
        } 
        
        // Handle the TableNotEnabledForNotificationException with 
        // a call to the SqlCacheDependencyAdmin.EnableTableForNotifications method. 
        catch (TableNotEnabledForNotificationException exTabDis) { 
            try { 
                SqlCacheDependencyAdmin.EnableTableForNotifications("Northwind", "Categories"); 
            } 
            
            // If a SqlException is thrown, redirect to an error page. 
            catch (SqlException exc) { 
                Response.Redirect(".\\ErrorPage.htm"); 
            } 
        } 
        
        // 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."; 
            
        } 
    } 
    
    else { 
        CacheMsg.Text = "The data was retrieved from the Cache."; 
    } 
} 

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

建構函式

TableNotEnabledForNotificationException()	初始化 TableNotEnabledForNotificationException 類別的新執行個體。
TableNotEnabledForNotificationException(String)	使用指定的錯誤訊息，初始化 TableNotEnabledForNotificationException 類別的新執行個體。
TableNotEnabledForNotificationException(String, Exception)	使用指定的錯誤訊息以及造成此例外狀況的內部例外狀況的參考，初始化 TableNotEnabledForNotificationException 類別的新執行個體。

屬性

Data	取得鍵值組的集合，這些鍵值組會提供關於例外狀況的其他使用者定義資訊。 (繼承來源 Exception)
HelpLink	取得或設定與這個例外狀況相關聯的說明檔連結。 (繼承來源 Exception)
HResult	取得或設定 HRESULT，它是指派給特定例外狀況的編碼數值。 (繼承來源 Exception)
InnerException	取得造成目前例外狀況的 Exception 執行個體。 (繼承來源 Exception)
Message	取得描述目前例外狀況的訊息。 (繼承來源 Exception)
Source	取得或設定造成錯誤的應用程式或物件的名稱。 (繼承來源 Exception)
StackTrace	取得呼叫堆疊上即時運算框架的字串表示。 (繼承來源 Exception)
TargetSite	取得擲回目前例外狀況的方法。 (繼承來源 Exception)

方法

Equals(Object)	判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetBaseException()	在衍生類別中覆寫時，傳回一或多個後續的例外狀況的根本原因 Exception。 (繼承來源 Exception)
GetHashCode()	做為預設雜湊函式。 (繼承來源 Object)
GetObjectData(SerializationInfo, StreamingContext)	在衍生類別中覆寫時，使用例外狀況的資訊設定 SerializationInfo。 (繼承來源 Exception)
GetType()	取得目前執行個體的執行階段類型。 (繼承來源 Exception)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	建立並傳回目前例外狀況的字串表示。 (繼承來源 Exception)

事件

SerializeObjectState

已過時。 當例外狀況序列化，以建立包含例外狀況相關序列化資料的例外狀況狀態物件時，就會發生此事件。 (繼承來源 Exception)