本文整理汇总了VB.NET中System.Windows.Forms.Control.PreviewKeyDown事件的典型用法代码示例。如果您正苦于以下问题：VB.NET Control.PreviewKeyDown事件的具体用法？VB.NET Control.PreviewKeyDown怎么用？VB.NET Control.PreviewKeyDown使用的例子？那么恭喜您, 这里精选的事件代码示例或许可以为您提供帮助。
在下文中一共展示了Control.PreviewKeyDown事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
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