BaseDataBoundControl.OnPagePreLoad(Object, EventArgs) 方法
定义
在加载数据绑定控件之前设置该控件的初始化状态。Sets the initialized state of the data-bound control before the control is loaded.
protected:
virtual void OnPagePreLoad(System::Object ^ sender, EventArgs ^ e);
protected virtual void OnPagePreLoad (object sender, EventArgs e);
abstract member OnPagePreLoad : obj * EventArgs -> unit
override this.OnPagePreLoad : obj * EventArgs -> unit
Protected Overridable Sub OnPagePreLoad (sender As Object, e As EventArgs)
参数
注解
OnPagePreLoad事件处理程序用于控制在页面的生命周期内何时发生数据绑定。The OnPagePreLoad event handler is used to control when data binding occurs within the life cycle of the page. 它通过设置数据绑定控件的内部初始化状态来实现此功能。It does this by setting the internal initialized state of the data-bound control. 由于控件的已初始化状态是在 PreLoad 页面生命周期的阶段中设置的,因此 OnDataPropertyChanged 只要在该阶段后更改控件的数据属性,就会调用事件处理程序,以指示控件在呈现之前必须重新绑定到其数据。Because the control's initialized state is set during the PreLoad phase of the page's lifecycle, the OnDataPropertyChanged event handler is called any time a data property of the control is changed after that phase, to signal that the control must re-bind to its data before rendering.