本文整理匯總了VB.NET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：VB.NET Control.PreviewKeyDown事件的具體用法？VB.NET Control.PreviewKeyDown怎麽用？VB.NET 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VB.NET代碼示例。
示例1: Form1
Public Class Form1
Public Sub New()
InitializeComponent()
' Form that has a button on it
AddHandler Button1.PreviewKeyDown, AddressOf Me.button1_PreviewKeyDown
AddHandler Button1.KeyDown, AddressOf Me.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")
End Sub
' By default, KeyDown does not fire for the ARROW keys
Private Sub button1_KeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
Select Case (e.KeyCode)
Case Keys.Down, Keys.Up
If (Not (Button1.ContextMenuStrip) Is Nothing) Then
Button1.ContextMenuStrip.Show(Button1, _
New Point(0, Button1.Height), ToolStripDropDownDirection.BelowRight)
End If
End Select
End Sub
' PreviewKeyDown is where you preview the key.
' Do not put any logic here, instead use the
' KeyDown event after setting IsInputKey to true.
Private Sub button1_PreviewKeyDown(ByVal sender As Object, ByVal e As PreviewKeyDownEventArgs)
Select Case (e.KeyCode)
Case Keys.Down, Keys.Up
e.IsInputKey = True
End Select
End Sub
End Class