在呈现UI时长时间运行应用程序后，WPF没有响应 [英] WPF gets not responding after leaving the application for a long time running while rendering the UI

问题描述

在呈现UI时长时间运行应用程序后，WPF没有响应。我需要知道为什么以及如何克服这种情况

WPF gets not responding after leaving the application for a long time running while rendering the UI. I need to know why and how to overcome this scenario

推荐答案

嗨Waleed，

Hi Waleed,

在安全软件开发中，特别是那些需要使用用户名和密码登录服务器的人，经常考虑长期无人操作，程序会自动跳转到用户登录界面。

In the software development for the security, especially those who need to use the username and password to log in to the server, often consider long-term unmanned operation, the program automatically jumps to the user login interface.

判断程序是否长时间无人值守有两个原因，即鼠标长时间不移动且鼠标焦点不在程序很长一段时间，所以这篇文章结合了两种情况，并且很长时间没有操作就实现了实际执行程序的响应
。

There are two reasons for judging whether the program is unmanned for a long time, that is, the mouse does not move for a long time and the mouse focus is not in the program for a long time, so this article combines two situations, and achieves the response of the real implementation program for a long time without operation.

为了防止这个问题，你可以在App.xaml.cs中添加Activated和Deactivated事件，

In order to prevent this issue, you can add Activated and Deactivated event in App.xaml.cs,

 public partial class App : Application
    {
        private DispatcherTimer mousePositionTimer;    
        private Point mousePosition;    
        private int checkCount = 0;   
 
        private DispatcherTimer deactivatedTimer;   
 
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);  
            mousePosition = GetMousePoint();  
 
            mousePositionTimer = new DispatcherTimer();
            mousePositionTimer.Tick += new EventHandler(MousePositionTimedEvent);
            mousePositionTimer.Interval = new TimeSpan(0, 0, 1);     
            mousePositionTimer.Start();
 
            deactivatedTimer = new DispatcherTimer();
            deactivatedTimer.Tick += new EventHandler(deactivatedTimer_Tick);
            deactivatedTimer.Interval = new TimeSpan(0, 0, 10);   
        }
 
        private void MousePositionTimedEvent(object sender, EventArgs e)
        {
            if (!HaveUsedTo())
            {
                checkCount++;    
checkCount + 1
                if (checkCount == 10)
                {
                    checkCount = 0;
                    mousePositionTimer.Stop();
                    
                    System.Windows.Forms.Application.Restart();
                    Application.Current.Shutdown();
                }
 
            }
            else
            {
                checkCount = 0;     
            }
        }
 
        private void deactivatedTimer_Tick(object sender, EventArgs e)
        {
            deactivatedTimer.Stop();
            
            System.Windows.Forms.Application.Restart();
            Application.Current.Shutdown();
        }
 
        
        private void Application_Activated(object sender, EventArgs e)
        {
            mousePositionTimer.Start();
            deactivatedTimer.Stop();
        }
 
        
        private void Application_Deactivated(object sender, EventArgs e)
        {
            mousePositionTimer.Stop();
            deactivatedTimer.Start();
        }
 
       
        private bool HaveUsedTo()
        {
            Point point = GetMousePoint();
            if (point == mousePosition)
            {
                return false;
            }
            mousePosition = point;
            return true;
        }
 
        [StructLayout(LayoutKind.Sequential)]
        private struct MPoint
        {
            public int X;
            public int Y;
 
            public MPoint(int x, int y)
            {
                this.X = x;
                this.Y = y;
            }
        }
 
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern bool GetCursorPos(out MPoint mpt);
 
        
        public Point GetMousePoint()
        {
            MPoint mpt = new MPoint();
            GetCursorPos(out mpt);
            Point p = new Point(mpt.X, mpt.Y);
            return p;
        } 
 
    }

最好的问候，

Cherry

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