C# Winform 文本框默认提示信息
private string Notes = "提示文本"; private void textBox1_Leave(object sender, EventArgs e) { // 退出失去焦点,若文本框内容为空,重新显示 if (string.IsNullOrEmpty(textBox1.Text)) { textBox1.ForeColor = Color.DarkGray; this.textBox1.Text = Notes; } } private void textBox1_Enter(object sender, EventArgs e) { // 进入获得焦点,若文本框内容为“提示文本”,清空 if (textBox1.Text == Notes) { textBox1.ForeColor = Color.Black; this.textBox1.Text = ""; } } 来源: https://www.cnblogs.com/baissy/p/11724042.html