Control.OnUnload(EventArgs) 方法

定义

引发 Unload 事件。

protected:
 virtual void OnUnload(EventArgs ^ e);
protected public:
 virtual void OnUnload(EventArgs ^ e);
protected virtual void OnUnload (EventArgs e);
protected internal virtual void OnUnload (EventArgs e);
abstract member OnUnload : EventArgs -> unit
override this.OnUnload : EventArgs -> unit
Protected Overridable Sub OnUnload (e As EventArgs)
Protected Friend Overridable Sub OnUnload (e As EventArgs)

参数

e
EventArgs

包含事件数据的 EventArgs 对象。

示例

// Override the OnUnLoad method to set _text to
// a default value if it is null.
protected override void OnUnload(EventArgs e)
{
    base.OnUnload(e);
    if (_text == null)
        _text = "Here is some default text.";
}
' Override the OnUnLoad method to set _text to
' a default value if it is null.
Protected Overrides Sub OnUnload(ByVal e As EventArgs)
    MyBase.OnUnload(e)
    If _text Is Nothing Then
        _text = "Here is some default text."
    End If
End Sub

注解

ASP.NET 调用此方法来引发 Unload 事件。 如果要开发自定义控件,则可以替代此方法以提供其他处理。 如果重写此方法,请调用基控件的 OnUnload 方法来通知事件的订阅者。

适用于

另请参阅