区分keydown和keypress事件

在KeyDown事件中，控制某个组合键：

例如 Ctrl + A

Private Sub RichTextBox1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles RichTextBox1.KeyDown        If e.Control = True And e.KeyCode = Keys.A Then            ' do something            e.Handled = True        End If    End Sub

在KeyPress事件中，控制某个按键，例如字母区域的A按键：

Private Sub RichTextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles RichTextBox1.KeyPress        If e.KeyChar = "A" Then ' A按键            ' do something            e.Handled = True        End If    End Sub