C# 如何在按住鼠标按钮时循环

Question

你能给我指出正确的方向吗？我试图在按下表单按钮时触发一个循环。

//pseudocode
While (button1 is pressed)
value1 += 1

然后当然会在释放按钮时停止循环

Answer 1

为避免使用线程，您可以添加 Timer在您的表单/控件上添加组件，只需在鼠标按下时启用它并在鼠标抬起时禁用它。然后将通常放在循环中的代码放入 Timer_Tick 事件中。如果您想使用 System.Timers.Timer，您可以改用 Timer.Elapsed 事件。

示例(使用 System.Timers.Timer):

using Timer = System.Timers.Timer;
using System.Timers;
using System.Windows.Forms;//WinForms example
private static Timer loopTimer;
private Button formButton;
public YourForm()
{ 
    //loop timer
    loopTimer = new Timer();
    loopTimer.Interval = 500;/interval in milliseconds
    loopTimer.Enabled = false;
    loopTimer.Elapsed += loopTimerEvent;
    loopTimer.AutoReset = true;
    //form button
    formButton.MouseDown += mouseDownEvent;
    formButton.MouseUp += mouseUpEvent;
}
private static void loopTimerEvent(Object source, ElapsedEventArgs e)
{
    //this does whatever you want to happen while clicking on the button
}
private static void mouseDownEvent(object sender, MouseEventArgs e)
{
    loopTimer.Enabled = true;
}
private static void mouseUpEvent(object sender, MouseEventArgs e)
{
    loopTimer.Enabled = false;
}