Control.ClearChildState Control.ClearChildState Control.ClearChildState Control.ClearChildState Method

Definición

Elimina la información sobre el estado de vista y el estado de control de los controles secundarios del control de servidor.Deletes the view-state and control-state information for all the server control's child controls.

protected:
 void ClearChildState();
protected void ClearChildState ();
member this.ClearChildState : unit -> unit
Protected Sub ClearChildState ()

Ejemplos

En el ejemplo de código siguiente se muestra cómo invalidar el OnDataBinding método para un control enlazado a datos con plantilla.The following code example demonstrates how to override the OnDataBinding method for a templated data-bound control. Si el origen de datos que se enlaza el control está lleno, el control ControlCollection colección está vacía mediante el Clear método y el ClearChildState método se usa para quitar cualquier información de estado que se haya guardado de los controles secundarios.If the data source that the control binds to is populated, the control's ControlCollection collection is emptied using the Clear method, and the ClearChildState method is used to remove any state information that had been saved for the child controls.

// Override to create the repeated items from the DataSource.
protected override void OnDataBinding(EventArgs e) {
    base.OnDataBinding(e);

    if (DataSource != null) {
        // Clear any existing child controls.
        Controls.Clear();
        // Clear any previous state for the existing child controls.
        ClearChildState();

        // Iterate over the DataSource, creating a new item for each data item.
        IEnumerator dataEnum = DataSource.GetEnumerator();
        int i = 0;
        while(dataEnum.MoveNext()) {

            // Create an item.
            RepeaterItem item = new RepeaterItem(i, dataEnum.Current);
            // Initialize the item from the template.
            ItemTemplate.InstantiateIn(item);
            // Add the item to the ControlCollection.
            Controls.Add(item);

            i++;
        }

        // Prevent child controls from being created again.
        ChildControlsCreated = true;
        // Store the number of items created in view state for postback scenarios.
        ViewState["NumItems"] = i;
    }
}
' Override to create the repeated items from the DataSource.
Protected Overrides Sub OnDataBinding(E As EventArgs)
    MyBase.OnDataBinding(e)

    If Not DataSource Is Nothing
        ' Clear any existing child controls.
        Controls.Clear()
        ' Clear any previous view state for the existing child controls.
        ClearChildState()

        ' Iterate over the DataSource, creating a new item for each data item.
        Dim DataEnum As IEnumerator = DataSource.GetEnumerator()
        Dim I As Integer = 0
        Do While (DataEnum.MoveNext())

            ' Create an item.
            Dim Item As RepeaterItemVB = New RepeaterItemVB(I, DataEnum.Current)
            ' Initialize the item from the template.
            ItemTemplate.InstantiateIn(Item)
            ' Add the item to the ControlCollection.
            Controls.Add(Item)

            I = I + 1
        Loop

        ' Prevent child controls from being created again.
        ChildControlsCreated = true
        ' Store the number of items created in view state for postback scenarios.
        ViewState("NumItems") = I
    End If
End Sub

Comentarios

El ClearChildState método borra toda la información de estado de vista y el estado de control para los controles secundarios.The ClearChildState method clears all view-state and control-state information for child controls. Es equivalente a llamar a la ClearChildViewState método y el ClearChildControlState método.It is equivalent to calling both the ClearChildViewState method and the ClearChildControlState method.

Al volver a crear los controles secundarios de un Control de objeto, utilice el ClearChildState método para borrar el estado secundario y no se aplique a los nuevos controles sin darse cuenta.When recreating child controls of a Control object, use the ClearChildState method to clear child state so that it does not get applied to the new controls inadvertently.

Se aplica a

Consulte también: