BaseDataBoundControl.IsBoundUsingDataSourceID 屬性

定義

命名空間:

System.Web.UI.WebControls

組件:

System.Web.dll

取得值，指出是否已設定 DataSourceID 屬性。

protected:
 property bool IsBoundUsingDataSourceID { bool get(); };

protected bool IsBoundUsingDataSourceID { get; }

member this.IsBoundUsingDataSourceID : bool

Protected ReadOnly Property IsBoundUsingDataSourceID As Boolean

屬性值

Boolean

如果 屬性設定為 以外的值， DataSourceID 則會傳回值 true ，否則值為 false 。 Empty

範例

下列程式碼範例示範衍生資料繫結控制項類別如何使用 IsBoundUsingDataSourceID 屬性。 屬性 IsBoundUsingDataSourceID 用於方法實作中 PerformSelect ，以判斷是否 DataBinding 應該引發事件。 此程式碼範例是提供給 類別之較大範例的 DataBoundControl 一部分。

protected override void PerformSelect() {            

   // Call OnDataBinding here if bound to a data source using the
   // DataSource property (instead of a DataSourceID), because the
   // databinding statement is evaluated before the call to GetData.       
    if (! IsBoundUsingDataSourceID) {
        OnDataBinding(EventArgs.Empty);
    }            
    
    // The GetData method retrieves the DataSourceView object from  
    // the IDataSource associated with the data-bound control.            
    GetData().Select(CreateDataSourceSelectArguments(), 
        OnDataSourceViewSelectCallback);
    
    // The PerformDataBinding method has completed.
    RequiresDataBinding = false;
    MarkAsDataBound();
    
    // Raise the DataBound event.
    OnDataBound(EventArgs.Empty);
}

Protected Overrides Sub PerformSelect()

    ' Call OnDataBinding here if bound to a data source using the 
    ' DataSource property (instead of a DataSourceID) because the 
    ' data-binding statement is evaluated before the call to GetData.
    If Not IsBoundUsingDataSourceID Then
        OnDataBinding(EventArgs.Empty)
    End If

    ' The GetData method retrieves the DataSourceView object from the 
    ' IDataSource associated with the data-bound control.            
    GetData().Select(CreateDataSourceSelectArguments(), _
        AddressOf OnDataSourceViewSelectCallback)

    ' The PerformDataBinding method has completed.
    RequiresDataBinding = False
    MarkAsDataBound()

    ' Raise the DataBound event.
        OnDataBound(EventArgs.Empty)

End Sub

備註

、、 DetailsView 和 等控制項會 IsBoundUsingDataSourceID 使用 屬性來判斷資料繫結控制項是否系結至 ASP.NET 2.0 資料來源控制項，例如 ObjectDataSource 或 SqlDataSource 。 GridViewMenuFormView

另請參閱

• ObjectDataSource
• SqlDataSource