如何使用C＃OnPaint事件？ [英] How to use the OnPaint event in C#?

问题描述

我看到网站上的一些类似的问题，但他们没有真的帮了我。

i saw some similar questions on the site but none of them really helped me.

我有绘制表格上的几行功能时，一个按钮点击的形状根据使用者在一些文本框输入的值而变化。

I have a function that draws a few lines on the form when a button is clicked that vary in shape depending on the values the user enters in some textboxes.

我的问题是，当我最小化的形式，这些线消失，我理解，这可以通过使用OnPaint事件得到解决，但我真的不知道怎么样。

My problem is that when i minimize the form, the lines disappear and i understood that this can be resolved by using the OnPaint event, but i don't really understand how.

谁能给我使用函数在推画点什么的一个简单的例子使用OnPaint事件的一个按钮？

Can anyone give me a simple example of using a function to draw something at the push of a button using the OnPaint event?

推荐答案

的Here你去，simpe上的用户绘制控件MSDN教程

Here you go, simpe MSDN tutorial on User-Drawn Controls

您必须继承按钮类并重写OnPaint方法

You must inherit Button class and override OnPaint method.

代码示例：

protected override void OnPaint(PaintEventArgs pe)
{
   // Call the OnPaint method of the base class.
   base.OnPaint(pe);

   // Declare and instantiate a new pen.
   System.Drawing.Pen myPen = new System.Drawing.Pen(Color.Aqua);

   // Draw an aqua rectangle in the rectangle represented by the control.
   pe.Graphics.DrawRectangle(myPen, new Rectangle(this.Location, 
      this.Size));
}

编辑：

添加属性到您的类和像众彩MyFancyTextColor {获取;集;} ，并在的OnPaint <使用它/ code>方法。 Alsow它会在Visual Studio窗体设计器的控件的属性编辑器apear。

Add property to your class and like public Color MyFancyTextColor {get;set;} and use it in your OnPaint method. Alsow it will apear in control property editor of visual studio form designer.

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