Visual Basic Key Listener

Question

我正在尝试在Visual Basic中编写一个程序（使用VS 2010），它将响应箭头键。我知道Java中有关键的监听器，但不确定VB中是否存在这样的东西以及如何对其进行编码。请告诉我一些关于此的例子。 感谢。

Answer 1

如果您正在执行winforms，请将表单的KeyPreview属性设置为true，然后设置KeyDown事件。你的代码将是这样的：

Dim previousKey As Keys? = Nothing

Private Sub Form1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
    If e.KeyCode = Keys.Up Then
        'up arrow
    End If


    If e.KeyCode = Keys.Left Then
        'left arrow
        If Not previousKey Is Nothing And previousKey = Keys.Up Then
            'Up arrow and then Left Arrow
            MessageBox.Show("there, that's better")
        End If
    End If

    If e.KeyCode = Keys.Right Then
        'right arrow
    End If

    If e.KeyCode = Keys.Down Then
        'down arrow
    End If

    'After everything is done set the current key as the previous key.
    previousKey = e.KeyCode
End Sub