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我正在使用 WPF 开发 ac# 项目，但我遇到了问题，这让我抓狂:) 这就是问题所在。我正在尝试使用计时器更改新窗口的不透明度。但是当我运行项目时，“this.Opacity += .1;” 代码抛出一个异常，如“无效操作等......”我正在使用以下代码从 MainWindow.cs 文件打开一个窗口：

private void MenuItemArchiveClick(object sender, RoutedEventArgs e)
    {
        var archiveWindow = new ArchiveWindow();
        var screenSize = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
        archiveWindow.Width = (screenSize.Width * 95) / 100;
        archiveWindow.Height = (screenSize.Height * 90) / 100;
        archiveWindow.WindowStartupLocation = WindowStartupLocation.CenterScreen;
        archiveWindow.Margin = new Thickness(0, 10, 0, 0);
        archiveWindow.AllowsTransparency = true;
        archiveWindow.Opacity = 0.1;
        archiveWindow.Topmost = true;
        archiveWindow.Show();
    }

我的 ArchiveWindow 代码是，

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Timers;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace POCentury
{
    /// <summary>
    /// Interaction logic for ArchiveWindow.xaml
    /// </summary>
    public partial class ArchiveWindow : Window
    {
        Timer timer1 = new Timer();

        public ArchiveWindow()
        {
            InitializeComponent();
            timer1.Interval = 1 * 1000;
            timer1.Elapsed += new ElapsedEventHandler(opacityChange);
            timer1.Enabled = true;
            timer1.AutoReset = false;
            timer1.Start();

        }
        private void opacityChange(object sender, EventArgs a)
        {
            if (this.Opacity == 1)
            {
                timer1.Stop();
            }
            else
            {
                this.Opacity += .1;
            }

        }
        private void ArchiveWindowClose()
        {
            timer1.Stop();
            this.Close();
        }
        private void btnArchiveWindowClose(object sender, RoutedEventArgs e)
        {
            ArchiveWindowClose();
        }

        private void imgPatternClick(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("sd");  
        }
    }
}

你能帮我做这件事吗？太感谢了！

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1 回答 1

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基本上，您无法访问 opacityChange 事件中的计时器，因为它发生在不同的线程中。您需要 Dispatcher 来执行此操作。

Dispatcher.BeginInvoke(new Action(() =>
{
        if (this.Opacity == 1)
        {
            timer1.Stop();
        }
        else
        {
            this.Opacity += .1;
        }
}));
于 2013-09-19T08:37:53.367 回答