Question

c# pictruebox怎么清除指定画的DrawImage

foreach (Control c in this.Controls)
{
int j = i - 1;
if (c is PictureBox)
{
if (c.Name.Equals("pictureBox" + i))
{
////c.BackColor = Color.FromName(ds.Tables[0].Rows[j]["英文颜色"].ToString());
PictureBox pic = (PictureBox)c;
Graphics g = pic.CreateGraphics();
g.DrawImage(picStg.Image, new RectangleF(new PointF(0, pic.Location.Y-40), new SizeF(pic.Size.Width-2, 50)));
if (i == 10)
{
g.DrawImage(picCar.Image, new RectangleF(new PointF(0, pic.Location.Y - 85), new SizeF(pic.Size.Width - 2, 60)));
}
}
}
}

以上是代码，我在某一个picturebox里面绘制了两个图像，现在我想手动清除i=10的那个绘制的图像，难道要全部清除再重新填充？有没有什么好的方法？

Answer 1

//新建一块画布
bitmap bmp=new bitmap(picCar.Image.Width,picCar.Image.Height);
//创建bmp的Graphics对象
Graphics G=Graphics.FromImage(bmp);
//将画布填充成与PictureBox背景颜色相同的颜色
G.fillRectangle(new SolidBrush(Picturebox.BackColor),new Rectangle(0, 0, bmp.Width, bmp.Height));
//将画布画到与picCar相同的位置
g.DrawImage(bmp, new RectangleF(new PointF(0, pic.Location.Y - 85), new SizeF(pic.Size.Width - 2, 60)));