本文整理匯總了C#中System.Windows.Forms.Control.PreviewKeyDown事件的典型用法代碼示例。如果您正苦於以下問題：C# Control.PreviewKeyDown事件的具體用法？C# Control.PreviewKeyDown怎麽用？C# Control.PreviewKeyDown使用的例子？那麽, 這裏精選的事件代碼示例或許可以為您提供幫助。
在下文中一共展示了Control.PreviewKeyDown事件的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C#代碼示例。
示例1: Form1
public Form1()
{
InitializeComponent();
// Form that has a button on it
button1.PreviewKeyDown +=new PreviewKeyDownEventHandler(button1_PreviewKeyDown);
button1.KeyDown += new KeyEventHandler(button1_KeyDown);
button1.ContextMenuStrip = new ContextMenuStrip();
// Add items to ContextMenuStrip
button1.ContextMenuStrip.Items.Add("One");
button1.ContextMenuStrip.Items.Add("Two");
button1.ContextMenuStrip.Items.Add("Three");
}
// By default, KeyDown does not fire for the ARROW keys
void button1_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Down:
case Keys.Up:
if (button1.ContextMenuStrip != null)
{
button1.ContextMenuStrip.Show(button1,
new Point(0, button1.Height), ToolStripDropDownDirection.BelowRight);
}
break;
}
}
// PreviewKeyDown is where you preview the key.
// Do not put any logic here, instead use the
// KeyDown event after setting IsInputKey to true.
private void button1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Down:
case Keys.Up:
e.IsInputKey = true;
break;
}
}