private void button1_Click(object sender, EventArgs e)
{
int height = 400, width = 600;
Bitmap image = new Bitmap(height, width);
Graphics g = Graphics.FromImage(image);//创建一个对象
g.Clear(Color.White);
Pen mypen = new Pen(new SolidBrush(Color.Blue), 1);
g.DrawLine(mypen, 100, 80, 100, 340);
this.panel1.BackgroundImage = image;
}
就是上面这样一段简单的代码，预期是画出一条竖线，可是它却出现了两条，第一次尝试GDI+，求解
------解决方案--------------------------------------------------------
设置panel1的backgroundimagelayout属性，如果是tile,图像会平铺，看上去像两条。
------解决方案--------------------------------------------------------
可以考虑采用“双缓存”技术：
- C# code
private void button1_Click(object sender, EventArgs e) { //int height = 400, width = 600; //Bitmap image = new Bitmap(height, width); Bitmap image = new Bitmap(DisplayRectangle.Width, DisplayRectangle.Height); using (Graphics g = Graphics.FromImage(image)) { g.Clear(Color.White); Pen mypen = new Pen(new SolidBrush(Color.Blue), 1); g.DrawLine(mypen, 100, 80, 100, 340); } this.panel1.BackgroundImage = image; }