Removing event handler from inside the event handler

最新推荐文章于 2022-02-20 13:08:58 发布

原创最新推荐文章于 2022-02-20 13:08:58 发布 · 276 阅读

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本文探讨了WPF应用程序中一个特定的事件处理器初始化问题。通过对比两种不同的实现方式，展示了如何避免编译器关于未初始化的警告。文章最终提供了一种可行的解决方案，确保事件处理器能够正确地被定义并使用。

The following code won't work:

RoutedEventHandler handler = (sender, eventArgs) =>
                {
                    var ui = sender as UIElement;
                    ui.Visibility = Visibility.Collapsed;
                    control.Click -= handler;
                };

the compiler complains the handler is not initialized.

But this code will shut up the compiler:

RoutedEventHandler handler = null;
                handler = (sender, eventArgs) =>
                {
                    var ui = sender as UIElement;
                    ui.Visibility = Visibility.Collapsed;
                    control.Click -= handler;
                };

funny.