c# – 在Custom Usercontrol – Window Store App中公开事件
发布时间:2020-12-15 22:06:01 所属栏目:百科 来源:网络整理
导读:我似乎在Xaml中暴露事件时遇到了问题.我在自定义用户控件中声明了一个公共事件处理程序. public sealed partial class FoodItemControl : UserControl{ public event EventHandlerStringEventArgs thumbnailClicked; public FoodItemControl() { InitializeC
我似乎在Xaml中暴露事件时遇到了问题.我在自定义用户控件中声明了一个公共事件处理程序.
public sealed partial class FoodItemControl : UserControl { public event EventHandler<StringEventArgs> thumbnailClicked; public FoodItemControl() { InitializeComponent(); (this.Content as FrameworkElement).DataContext = this; } private void Thumbnail_Tapped(object sender,TappedRoutedEventArgs e) { var handler = thumbnailClicked; if (handler != null) { handler(this,new StringEventArgs()); } } } 但是当我在xaml中为它分配事件时,无法找到暴露的事件处理程序.即 <local:FoodItemControl thumbnailClicked="SOMETHING" /> 我在发现的例子中遗漏了什么吗? 编辑:我的问题似乎是我将事件定义为EventHandler< StringEventArgs>.一旦我将其改为简单的EventHandler I.e public event EventHandler thumbnailedClicked; 但是我还是不明白为什么? 解决方法
您必须创建依赖项属性并注册该属性以在用户控件中公开它:
public sealed partial class FoodItemControl : UserControl { public EventHandler thumbnailClicked { get { return (EventHandler)GetValue(thumbnailClickedProperty); } set { SetValue(thumbnailClickedProperty,value); } } public static readonly DependencyProperty thumbnailClickedProperty = DependencyProperty.Register("thumbnailClicked",typeof(EventHandler),typeof(FoodItemControl),new PropertyMetadata("")); public FoodItemControl() { this.InitializeComponent(); (this.Content as FrameworkElement).DataContext = this; } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |