DataBoundControl.GetData 方法

protected:
 virtual System::Web::UI::DataSourceView ^ GetData();

protected virtual System.Web.UI.DataSourceView GetData ();

abstract member GetData : unit -> System.Web.UI.DataSourceView
override this.GetData : unit -> System.Web.UI.DataSourceView

Protected Overridable Function GetData () As DataSourceView

傳回

DataSourceView，資料繫結控制項將其用於執行資料作業。 如果設定 DataMember 屬性，則會傳回特定的具名 DataSourceView，否則會傳回預設 DataSourceView。

例外狀況

範例

下列程式碼範例示範如何 GetData 呼叫 方法，以 DataSourceView 從相關聯的資料來源控制項擷取物件，並 Select 呼叫 方法來擷取資料。 此程式碼範例是針對 類別提供的較大範例的 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

GetData方法會 DataSourceView 藉由呼叫 GetDataSource 方法，從相關聯的資料來源控制項擷取 物件。 DataSource如果使用 屬性來識別資料來源，則會建立預設 DataSourceView 物件。

適用於

另請參閱

• GetDataSource()
• DataMember