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public Form1()
{
InitializeComponent();
TextBox input_pasword = new TextBox() { Size = new Size(90, 25), Location = new Point(10, 10), PasswordChar = '*', };
this.Controls.Add(input_pasword);
// 可以是图像什么的
Panel panel = new Panel() { Size = new Size(50, 25), Location = new Point(120, 10), BackColor = Color.Salmon };
panel.MouseDown += (sender, e) => { input_pasword.PasswordChar = '\0'; };
panel.MouseUp += (sender, e) => { input_pasword.PasswordChar = '*'; };
this.Controls.Add(panel);
}