private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { char c = e.KeyChar; if (char.IsLetter(c)) label1.Text = "字母"; else if (char.IsDigit(c)) label1.Text = "数字"; else if (char.IsPunctuation(c)) label1.Text = "标点"; else label1.Text = "其他"; }
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