Control.HasChildViewState 屬性

定義

命名空間:

System.Web.UI

組件:

System.Web.dll

取得值，指出目前伺服器控制項的子控制項是否有任何已儲存的檢視狀態設定。

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

protected bool HasChildViewState { get; }

member this.HasChildViewState : bool

Protected ReadOnly Property HasChildViewState As Boolean

屬性值

Boolean

如果任何子控制項有儲存的檢視狀態資訊，則為 true，否則為 false。

範例

public override void DataBind() 
{
   base.OnDataBinding(EventArgs.Empty);
   // Reset the control's state.
   Controls.Clear();
   // Check for HasChildViewState to avoid unnecessary calls to ClearChildViewState.
   if (HasChildViewState)
      ClearChildViewState();
   ChildControlsCreated = true;
   if (!IsTrackingViewState)
      TrackViewState();
}

Public Overrides Sub DataBind()
   MyBase.OnDataBinding(EventArgs.Empty)
   ' Reset the control's state.
   Controls.Clear()
   ' Check for HasChildViewState to avoid unnecessary calls to ClearChildViewState.
   If HasChildViewState Then
      ClearChildViewState()
   End If
   ChildControlsCreated = True
   If Not IsTrackingViewState Then
      TrackViewState()
   End If
End Sub

備註

您可以使用這個屬性來避免對 方法進行不必要的呼叫 ClearChildViewState ，以確認伺服器控制項的任何子控制項都儲存檢視狀態資訊。

另請參閱

• ViewState