C＃Invalidate不调用paint方法 [英] C# Invalidate is not calling paint method

问题描述

我有OnPaint方法overrided到在屏幕上绘制一个椭圆。

I have OnPaint method overrided to draw an Ellipse on the screen.

    protected override void OnPaint(PaintEventArgs e)
    {
        MessageBox.Show("Paint");
        if (debugStarted)
        {
            int y = rtbLogicCode.PlaceToPoint(new Place(0, debugLine)).Y;
            if (rtbLogicCode.GetVisibleState(debugLine).ToString() == "Visible")
            {
                e.Graphics.FillEllipse(new LinearGradientBrush(new Rectangle(0, y, 15, 15), Color.LightPink, Color.Red, 45), 0, y, 15, 15);
            }
            base.OnPaint(e);
        }
    }

    private void rtbLogicCode_Scroll(object sender, ScrollEventArgs e)
    {
        this.Invalidate();
    }

scroll事件（在RichTextBox中）得到妥善处理，但即使我无效，这不是调用的OnPaint函数（MessageBox中未显示）的形式。

The scroll event (On the Richtextbox) is handled properly but even though I am invalidating the form, it isn't calling the OnPaint function (The messagebox isn't showing).

可能是什么的这个可能的原因？

What could be the possible cause of this?

编辑：我忘了提，在子窗体（添加为使用MDI财产的主要形式的控制），我的初始化函数，我设置以下样式：

I have forgot to mention that on my initialization function of the child form (added as a control of the main form using MDI property), I set the following styles:

 private void LogicCodeInit()
    {


            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.UserPaint, true);


    }

EDIT2：我也忘了提到子窗体添加为的TabControl的控制。在的TabControl然后加入为主要形式的控制。

I've also forgot to mention that the child form is added as a control of TabControl. The TabControl then is added as a control of the main form.

推荐答案

呼叫更新在的Invalidate 。 的Invalidate 重绘，只有当它具有焦点，它可能没有得到焦点，因为它被添加为的TabControl 子的形式。

Call Update after Invalidate. Invalidate repaints the form only if it has focus, it's probably not getting focus since it's being added as a TabControl child.

文档：

调用Invalidate方法不会强制同步漆;强制同步油漆，拨打调用Invalidate方法后Update方法。当这个方法被调用不带参数，整个客户区被添加到更新区域。

Calling the Invalidate method does not force a synchronous paint; to force a synchronous paint, call the Update method after calling the Invalidate method. When this method is called with no parameters, the entire client area is added to the update region.

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