C# WinForms - Paint 方法问题
我不确定使用图形的最佳方法是什么 - 我应该将我的类附加到主窗体 Paint 事件然后进行绘图，还是最好像这样从覆盖的 OnPaint void 中调用它？我的意思是，这样做可以吗：
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e) //what is this good for? My app works without it as well
Graphics g=e.Graphics;
DrawEnemies(g);
UpdateHUD(g);
DrawSelectedUnit(g);
}
I am not sure what is the best way of using graphics - should I attach my classes to main form Paint event and then do the drawing, or it is better to call it from overidden OnPaint void like this? I mean, is it OK to do that like this:
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e) //what is this good for? My app works without it as well
Graphics g=e.Graphics;
DrawEnemies(g);
UpdateHUD(g);
DrawSelectedUnit(g);
}
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评论（2）
建议控件重写
On...方法，而不是订阅自己的事件。您应该调用
base.OnPaint以确保正确触发Paint方法。来自 MSDN：
It is recommended that controls override the
On...methods rather than subscribe to their own events.You should call
base.OnPaintto ensure thePaintmethod is fired properly.From MSDN:
这其实并不重要；两者都有效。理论上，重写
OnPaint可能会稍微快一点，但这并不是任何人都会注意到的差异。微软建议重写OnPaint，但并没有真正推动这一点。您需要调用
base.OnPaint，因为此方法将调用附加到Paint事件的处理程序。It doesn't really matter; both work. Overriding
OnPaintmight be ever so slightly faster in theory, but it's not a difference that anyone will notice. Microsoft recommends overridingOnPaintbut doesn't really motivate this.You need to call
base.OnPaintbecause this method will invoke handlers attached to thePaintevent.