[WPF疑难]Hide me! not close
周银辉
有朋友遇到这样的一个问题,在WPF中,当Closing一个窗体时,将e.Cancel=true,然后再调用Hide()方法,以便隐藏窗口而不是关
闭,但报异常了:“当Window
Closing时不能设置Visibility,或调用Show(),Close(),Hide()方法”。OK,本随笔将帮你解决该问题。
问题的关键在于不能再Closing方法中调用Close等,那么只要我们知道用户有意图关闭窗体时,仅仅再Closing方法中取消关闭,然后在
Closing紧接着的某个方法中调用Hide就OK了。为了体现这个“紧接着的某个方法”,让我联想到方法排队,比如多个线程中的方法使用同一个对象
时,这些方法将被排队,否则异常。那么就用Invoke来帮我们实现这个排队就OK了。
假设我们的Window类型的win2时一个需要隐藏的窗口,企图关闭该窗体时其会被隐藏,点击主窗口上的btnShowWin2按钮时窗体会再次被显示。
我们实现一个Delegate,其代理的方法将异常窗体:
[WPF疑难]Hide me! not close delegate void WillHide();
[WPF疑难]Hide me! not close //
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close private WillHide willHide;
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.willHide = new WillHide(this.HideWin2);
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close private void HideWin2()
[WPF疑难]Hide me! not close {
[WPF疑难]Hide me! not close this.win2.Hide();
[WPF疑难]Hide me! not close }
[WPF疑难]Hide me! not close 当Closing时我们这样:
[WPF疑难]Hide me! not close void win2_Closing(object sender, CancelEventArgs e)
[WPF疑难]Hide me! not close {
[WPF疑难]Hide me! not close e.Cancel = true;
[WPF疑难]Hide me! not close Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, this.willHide);
[WPF疑难]Hide me! not close }
Everything is OK!
整体的代码:
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close using System;
[WPF疑难]Hide me! not close using System.Collections.Generic;
[WPF疑难]Hide me! not close using System.Linq;
[WPF疑难]Hide me! not close using System.Text;
[WPF疑难]Hide me! not close using System.Windows;
[WPF疑难]Hide me! not close using System.Windows.Controls;
[WPF疑难]Hide me! not close using System.Windows.Data;
[WPF疑难]Hide me! not close using System.Windows.Documents;
[WPF疑难]Hide me! not close using System.Windows.Input;
[WPF疑难]Hide me! not close using System.Windows.Media;
[WPF疑难]Hide me! not close using System.Windows.Media.Imaging;
[WPF疑难]Hide me! not close using System.Windows.Navigation;
[WPF疑难]Hide me! not close using System.Windows.Shapes;
[WPF疑难]Hide me! not close using System.ComponentModel;
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close namespace ClosingDemo
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close /// <summary>
[WPF疑难]Hide me! not close /// Interaction logic for Window1.xaml
[WPF疑难]Hide me! not close /// </summary>
[WPF疑难]Hide me! not close public partial class Window1 : Window
[WPF疑难]Hide me! not close {
[WPF疑难]Hide me! not close delegate void WillHide();
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close private Window2 win2 = new Window2();
[WPF疑难]Hide me! not close private WillHide willHide;
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close public Window1()
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close InitializeComponent();
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close Test();
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close private void HideWin2()
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.win2.Hide();
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close private void Test()
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close App.Current.MainWindow = this;
[WPF疑难]Hide me! not close App.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.willHide = new WillHide(this.HideWin2);
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.win2.Closing += new CancelEventHandler(win2_Closing);
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.btnShowWin2.Click += new RoutedEventHandler(btnShowWin2_Click);
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close this.win2.Show();
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close void btnShowWin2_Click(object sender, RoutedEventArgs e)
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close }
[WPF疑难]Hide me! not close
[WPF疑难]Hide me! not close