Public Class Form1

? ? Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
? ? ? ? Label3.Text = "e.KeyChar:"
? ? ? ? Label4.Text = "e.KeyChar的值："
? ? End Sub
? ? '清除文體框
? ? Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
? ? ? ? TextBox1.Text = ""
? ? ? ? TextBox2.Text = ""
? ? End Sub
? ? '退出
? ? Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
? ? ? ? Me.Close()
? ? End Sub

? ? Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
? ? ? ? Label3.Text = Mid(Label3.Text, 1, 10) & e.KeyChar
? ? ? ? Label4.Text = Mid(Label4.Text, 1, 10) & Convert.ToInt32(e.KeyChar)
? ? ? ? Dim str As String
? ? ? ? str = e.KeyChar
? ? ? ? Select Case str
? ? ? ? ? ? Case "a" To "z"
? ? ? ? ? ? ? ? str = Chr(Convert.ToInt32(e.KeyChar) - 32)
? ? ? ? ? ? Case "A" To "Z"
? ? ? ? ? ? ? ? str = Chr(Convert.ToInt32(e.KeyChar) + 32)
? ? ? ? ? ? Case Else
? ? ? ? ? ? ? ? str = "*"
? ? ? ? End Select
? ? ? ? TextBox2.Text = TextBox2.Text & str
? ? End Sub
End Class
?

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