在文本框中的按键事件上显示错误消息

问题描述：

private void txtzip_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (char.IsLetter(e.KeyChar))
            {
                MessageBox.Show("Hi");
            }
        }

当用户键入不符合以上条件但无法正常工作的错误内容时，我使用了上面的编码来显示消息.我还给出了keypreview = true

i used above coding to show message when user type wrong thing which is not match above condition but its not working ., i also given keypreview=true

答

您好，亲爱的，
使用此代码，它将起作用

Hello dear,
use this code, it will work

if (char.IsLetter(e.KeyChar))
            {
                MessageBox.Show("Hi");
            }

试试这个.

http://www.daniweb.com/software-development/vbnet/threads/114278/textbox-key-press-event [ ^ ]

Hi,
try This one.

http://www.daniweb.com/software-development/vbnet/threads/114278/textbox-key-press-event[^]

在文本框中的按键事件上显示错误消息

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