从自定义控件的模板部分中删除事件处理程序
|
当我第一次开始编写WPF自定义控件时，如果要添加事件处理程序，可以在获取模板部分后在控件的OnApplyTemplate重写中进行操作：
public void override OnApplyTemplate() {
if ( addMenu != null ) {
addMenu.Click -= addMenu_Click;
addMenu = null;
}
addMenu = (MenuItem)Template.FindName(\"PART_AddMenu\", this);
addMenu.Click += addMenu_Click;
}
public MyCustomControl()
{
Loaded += this_Loaded;
}
void this_Loaded(object sender, RoutedEventArgs e)
{
Unloaded += this_Unloaded;
addMenu = (MenuItem)Template.FindName(\"PART_AddMenu\", this);
addMenu.Click += addMenu_Click;
}
void this_Unloaded(object sender, RoutedEventArgs e)
{
Unloaded -= this_Unloaded;
if (addMenu != null)
{
addMenu.Click -= addMenu_Click;
addMenu = null;
}
}
没有找到相关结果
已邀请:
2 个回复
傻零凰死授
目浆搽
方法注销在中注册的事件。您可以重写该方法，因为它位于PresentationFramework dll的内部，但是您可以重写受保护的方法以执行相同的操作-在Control基类中由调用它。 以下示例代码可以放入您的自定义控件中：public override void OnApplyTemplate() { base.OnApplyTemplate(); EditableTextBoxSite = GetTemplateChild(\"PART_EditableTextBox\") as TextBox; EditableTextBoxSite.TextChanged += new TextChangedEventHandler(this.OnEditableTextBoxTextChanged); this.EditableTextBoxSite.PreviewTextInput -= new TextCompositionEventHandler(this.OnEditableTextBoxPreviewTextInput); } protected override void OnTemplateChanged(ControlTemplate oldTemplate, ControlTemplate newTemplate) { base.OnTemplateChanged(oldTemplate, newTemplate); if (this.EditableTextBoxSite == null) return; this.EditableTextBoxSite.TextChanged -= new TextChangedEventHandler(this.OnEditableTextBoxTextChanged); this.EditableTextBoxSite.PreviewTextInput -= new TextCompositionEventHandler(this.OnEditableTextBoxPreviewTextInput); }