相关疑难解决方法(0)

我经常看到它提到Thread.Sleep();不应该使用,但我不明白为什么会这样.如果Thread.Sleep();可能造成麻烦,是否有任何替代解决方案具有相同的安全性？

例如.

while(true)
{
    doSomework();
    i++;
    Thread.Sleep(5000);
}

另一个是:

while (true)
{
    string[] images = Directory.GetFiles(@"C:\Dir", "*.png");

    foreach (string image in images)
    {
        this.Invoke(() => this.Enabled = true);
        pictureBox1.Image = new Bitmap(image);
        Thread.Sleep(1000);
    }
}

我正在编写一个连续的轮询循环来监视某些事件发生,然后在UI线程上采取一些操作.

我正在编写以下代码

public static void HandlePopup(this HostedControl control, string className, string caption, System.Action callback)
    {
        var popupTask = Task.Factory.StartNew(() =>
        {
            Thread.Sleep(5000); // just wait for 5 seconds.
        }, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default).ContinueWith((prevTask) =>
        {
            AutomationElementCollection collection = null;
            do
            {

            } while (true);
        }, CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.FromCurrentSynchronizationContext()).ContinueWith((prevTask) =>
        {
            if (!prevTask.IsFaulted)
            {
                if (control.InvokeRequired)
                {
                    control.Invoke(callback);
                }
                else 
                {
                    callback();
                }
            }
        }, CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.FromCurrentSynchronizationContext());

        try
        {
            ////popupTask.Wait();
        }
        catch (AggregateException ex)
        {
            ex.Handle(exnew =>
            {
                return true;
            }); …

背景:我正在编写一个应用程序,它遍历服务器列表并获取有关每台机器的各种详细信息.在迭代期间,我需要更新表单上的各种控件(以显示所获取信息的摘要).因为它正在遍历列表,所以我调用了Thread.Sleep()以允许用户有时间在查询下一台机器之前读取信息.以下是我的代码:

Task TestTask = Task.Factory.StartNew(() =>
            {
                foreach (String IpAddress in ServersToCheck)
                {
                    if (IpAddress != String.Empty)
                    {
                        ServerBeingCheckedLabel.Text = IpAddress;
                        if (PingServer(IpAddress) == true)
                        {
                            PingChar_Label.ForeColor = Color.Green;
                            PingChar_Label.Text = "a";
                            CheckPermissionsAreValid(IpAddress);
                        }
                        else
                        {
                            PingChar_Label.ForeColor = Color.Red;
                            PingChar_Label.Text = "r";
                            PermChar_Label.ForeColor = Color.Red;
                            PermChar_Label.Text = "r";
                        }
                    }
                }
                Thread.Sleep(10000);
                this.BackColor = FormBackGroundColor;
                TestButton.Enabled = true;
                RunTimer.Enabled = true;
            }, CancellationToken.None, TaskCreationOptions.None, UiScheduler);

这在更新窗体上的控件时工作正常,但在Thread.Sleep()期间,UI会锁定.当然,如果在单独的任务上调用Thread.Sleep(),UI线程仍然未被阻塞？