winform下的方法如下:
pictureBox1.BackColor = Color.Green;
button1.BackColor = Color.Green;
textBox1.BackColor = Color.Green;
TransparencyKey = Color.Green;
限制:只能針對窗體,因爲TransparencyKey 屬性只有窗體纔有
效果圖見:https://jingyan.baidu.com/article/0320e2c1031fc01b86507b76.html