本文介绍了这段代码中的错误是什么?视觉工作室的错误是“预期的的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 命名空间 timer33 { / // < 摘要 > /// 交互逻辑for MainWindow.xaml /// < ; / summary > public partial class MainWindow:Window { public MainWindow() { InitializeComponent(); } public static 类 DelayedExecutionService { public static void DelayedExecute(操作操作, int delay = 3 ) { var dispatcherTimer = new System.Windows.Threading.DispatcherTimer( ); EventHandler handler = null ; handler =(sender,e)= > { // 停止计时器,使其不会每隔X秒执行一次 // 并且还避免将处理程序保留在内存中。 dispatcherTimer.Tick - = handler; dispatcherTimer.Stop(); // 执行操作。 action(); }; dispatcherTimer.Tick + = handler; dispatcherTimer.Interval = TimeSpan.FromSeconds(delay); private void button1_Click( object sender,RoutedEventArgs e) { var dispatcherTimer = new System.Windows .Threading.DispatcherTimer(); dispatcherTimer.Start(); DelayedExecutionService.DelayedExecute(()= > MessageBox.Show( Hello!)); } } } } 解决方案 简单:你不能嵌套方法:你的button1_Click处理程序在你的DelayedExecute方法体内,这是不允许的。 namespace timer33{ /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } public static class DelayedExecutionService { public static void DelayedExecute(Action action, int delay = 3) { var dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); EventHandler handler = null; handler = (sender, e) => { // Stop the timer so it won't keep executing every X seconds // and also avoid keeping the handler in memory. dispatcherTimer.Tick -= handler; dispatcherTimer.Stop(); // Perform the action. action(); }; dispatcherTimer.Tick += handler; dispatcherTimer.Interval = TimeSpan.FromSeconds(delay); private void button1_Click(object sender, RoutedEventArgs e) { var dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); dispatcherTimer.Start(); DelayedExecutionService.DelayedExecute(() => MessageBox.Show("Hello!")); } } } } 解决方案 Simple: you can't nest methods: Your button1_Click handler is inside the body of your DelayedExecute method, which is not allowed. 这篇关于这段代码中的错误是什么?视觉工作室的错误是“预期的的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!
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