C#透明按钮设置

完全透明的按钮，只在鼠标经过时显示边框线。
属性Button.Image设置图片按钮，可与背景完美结合。

 public void setButtonStyle(Button btn)
        {
            btn.ForeColor = Color.Transparent;
            btn.BackColor = Color.Transparent;
            btn.FlatStyle = FlatStyle.Flat;
            btn.FlatAppearance.BorderSize = 0;
            btn.FlatAppearance.MouseOverBackColor = Color.Transparent;
            btn.FlatAppearance.MouseDownBackColor = Color.Transparent;
        }