Backgroundworker无法执行

[G-Oker]

您好，
我正在尝试一个消息框"click"回车键（如果在指定时间内保持打开状态）。
我可以使用计时器来完成此操作，但是问题是，如果在该时间段内有用户输入，则关键仍然是"pushed"计时器（注意：这应该不成问题，因为应用程序上没有其他应按Enter键的问题。
因为它更加整洁，并且出于谨慎的考虑而出错，所以我试图让背景工作人员来代替它，但是我无法解雇/执行。

这里有人可以查看我的代码并指出我在做什么/可能做错了吗？

            private void timer1_Tick(object sender, EventArgs e)
                {
                timer1.Enabled = false;
                SendKeys.Send("{ENTER}"); // SendWait as alternative
                }
                
                        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
                {
    
                //timer1.Interval = 10000;
                //timer1.Enabled = true;
                backgroundWorker1.RunWorkerAsync();
    
                if (MessageBox.Show("Are you sure you want to close?", "Leave ? ", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
                    {
                    e.Cancel = false;
                    }
                else
                    {
                    e.Cancel = true;
                    }
                }
    
            private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
                {
                Thread.Sleep(5000);
                SendKeys.Send("{ENTER}"); //or Esc
                }

谢谢。

 

[跳伞]

您是否在第27行上设置了一个断点，以真正向自己证明后台工作者没有运行？

Or is the issue really that the background worker is working, but the SendKeys() is not actually sending the Enter key to the UI thread?

 

[G-Oker]

您是否在第27行上设置了一个断点，以真正向自己证明后台工作者没有运行？

Or is the issue really that the background worker is working, but the SendKeys() is not actually sending the Enter key to the UI thread?

谢谢你的回复

不，我没有设置断点，我编译了代码，并打开了信息框，但它仍然保持打开状态。不过，您提出了一个问题，我将在这里尝试一些操作，看看它是否正在触发，如果sendkey不起作用。谢谢

 

[约翰·H]

这种方法会给您带来各种麻烦。对于带有超时的MessageBox，我喜欢这里的帖子之一： 几秒钟后关闭MessageBox
代码如下：

var autoclose = false;
var w = new Form() { Size = new Size(0, 0) };
Task.Delay(TimeSpan.FromSeconds(3))
    .ContinueWith((t) => { w.Close(); autoclose = true; }, TaskScheduler.FromCurrentSynchronizationContext());

var result = MessageBox.Show(w, "Are you sure you want to close?", "Leave ? ", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
e.Cancel = !autoclose && result == DialogResult.No;

An owner window is created and a Task used to close it. The dialog will automatically close if the owner is closed first. Dialog result will be No if that happens, so I added a variable to see if timeout happened and use that in e.Cancel expression. The logic is kind of inverted here since true cancels closing

 

[G-Oker]

这种方法会给您带来各种麻烦。对于带有超时的MessageBox，我喜欢这里的帖子之一： 几秒钟后关闭MessageBox
代码如下：

var autoclose = false;
var w = new Form() { Size = new Size(0, 0) };
Task.Delay(TimeSpan.FromSeconds(3))
    .ContinueWith((t) => { w.Close(); autoclose = true; }, TaskScheduler.FromCurrentSynchronizationContext());

var result = MessageBox.Show(w, "Are you sure you want to close?", "Leave ? ", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
e.Cancel = !autoclose && result == DialogResult.No;

An owner window is created and a Task used to close it. The dialog will automatically close if the owner is closed first. Dialog result will be No if that happens, so I added a variable to see if timeout happened and use that in e.Cancel expression. The logic is kind of inverted here since true cancels closing

主席先生，您是STAR。这很完美。非常感谢你