RichTextBox和UserPaint

我正在尝试绘制RichTextBox，但我能做到的唯一方法是调用OnPaint/OnPaintBackground 。

问题是除非“UserPaint”标志打开，否则不会调用OnPaint或OnPaintBackground，但是当此标志打开时 – 文本本身不会被绘制！

我该怎么解决这个问题？

Answer 1

这是我用来确保在RichTextBox首先处理绘画本身后调用OnPaint的代码：

 class MyRichTextBox: RichTextBox { private const int WM_PAINT = 15; protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc (ref m); if (m.Msg == WM_PAINT && !inhibitPaint) { // raise the paint event using (Graphics graphic = base.CreateGraphics()) OnPaint(new PaintEventArgs(graphic, base.ClientRectangle)); } } private bool inhibitPaint = false; public bool InhibitPaint { set { inhibitPaint = value; } } }