效果:
代码:
private void textBox1_TextChanged(object sender, EventArgs e) { string content = this.textBox1.Text; int length = content.Length; if(length>=5 && length<=7) { string temp = ""; if(length == 5) { temp = content.Replace(content.Substring(4, 1), "*"); }else if(length == 6) { temp = content.Replace(content.Substring(5, 1), "*"); }else if(length == 7) { temp = content.Replace(content.Substring(6, 1), "*"); } this.textBox1.Text = temp; textBox1.SelectionStart = textBox1.TextLength;//设置文本框选定的文本起点 } }
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