1.Flat button

用这个方法，前提是要把button的type设置为Flat

button1.TabStop = false; button1.FlatAppearance.BorderSize = 0;button1.FlatAppearance.BorderColor = Color.FromArgb(0, 255, 255, 255); //设置边框的颜色Transparentbutton1.FlatAppearance.MouseOverBackColor = Color.FromArgb(0, 255, 255, 255); //设置鼠标经过时候的背景颜色Transparentbutton1.FlatAppearance.MouseDownBackColor = Color.FromArgb(0, 255, 255, 255); //设置鼠标按下时候的背景颜色Transparent

这样按钮的效果图如下

后面的颜色是窗体的颜色不是按钮的颜色。

接下来响应点击事件。

//鼠标落下设置一张图片private void button1_MouseDown(object sender, MouseEventArgs e){     this.button1.Image = Image.FromFile(@"../../images/close_click.png");}//鼠标弹起恢复原来图片private void button1_MouseUp(object sender, MouseEventArgs e){     this.button1.Image = Image.FromFile(@"../../images/close_default.png");}//响应点击事件private void button1_Click(object sender, EventArgs e){     MessageBox.Show("I'm normal button");}

2.用pictureBox

private void pictureBox2_MouseDown(object sender, MouseEventArgs e) {      this.pictureBox2.Image = Image.FromFile(@"../../images/close_click.png");}private void pictureBox2_MouseUp(object sender, MouseEventArgs e){     this.pictureBox2.Image = Image.FromFile(@"../../images/close_default.png");}private void pictureBox2_Click(object sender, EventArgs e){      MessageBox.Show("I'm closed");}