问题 单项选择题

在窗体上画一个名称为Text1的文本框,要求文本框只能接收大写字母的输入。以下能实现该操作的事件过程是( )。

A.Private Sub Text1_KeyPress(KeyAscii As Integer)   If KeyAscii<65 Or KeyAscii>90 Then    MsgBox"请输入大写字母"    KeyAscii=0   End If  End Sub

B.Private Sub Text1_KeyDown(KeyCode As Integer,Shift As Integer) If KeyCode<65 Or KeyCode>90 Then   MsgBox"请输入大写字母“   KeyCode=0    End If End Sub

C.Private Sub Text1_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single) If Asc(Text1.Text)<65 Or Asc(Text1.Text)>90 Then   MsgBox"请输入大写字母"  End If End Sub

D.Private Sub Text1_Change()   If Asc(Text1.Text)>64 And Asc(Text1.Text)<91 Then    MsgBox"请输入大写字母"   End If End Sub

答案

参考答案:A

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单项选择题