Question

C# 在panel中绘图为何paint事件一直触发？

panel控件一直闪烁，调试发现paint事件不停的触发
private void Form1_Paint(object sender, PaintEventArgs e)
{
Bitmap bitm = new Bitmap(this.panel1.Width, this.panel1.Height);
Graphics g = Graphics.FromImage(bitm);
g.Clear(Color.White);
Pen p = new Pen(Color.Black, 5);
g.DrawLine(p, 20, 20, 20, this.panel1.Height - 20);
this.panel1.BackgroundImage = bitm;

p.Dispose();
g.Dispose();

}

Answer 1

调用了设置背景图 这条会触发重画事件 这个死循环了