blocks|key|333262|text|我们在过去遇到过类似的问题，结果是使用了过多的停靠和表格布局面板。我会建议，如果可能的话，尝试用最少的停靠来重建UI+(因为表格布局面板也在内部使用停靠)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|333263|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

We have encountered same kind of problem in past and it comes out to be use of excessive docking and table layout panels. I will suggest, if possible, try to re-construct the UI with minimal use of docking (as table layout panel also uses docking internally).

blocks|key|3306586|text|在Windows窗体中，DoubleBuffered属性不影响文本框等子控件。相反，它只影响为其设置的窗体或面板。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3306587|如果要对窗体上的子元素进行双缓冲，则需要实现手动双缓冲。|3306588|Bob+Powell写了一篇关于如何做到这一点的good+article+(和其他人)。|offset|length|3306589|此外，来自forum+answer的鲍勃还说：|3306590|3306591|窗口的所有权意味着它们将无法控制地闪烁，因为您不能在目标窗口区域之外进行双缓冲。具有子控件的面板不能将其自身及其子控件设置为双缓冲区。|blockquote|3306592|3306593|正确执行此操作的唯一方法是创建单个控件，该控件使用保留模式图形系统的形式完成所有绘图。|3306594|3306595|因此，要使用手动双缓冲获得无闪烁的文本框大小，您需要以某种方式将文本框渲染到后台缓冲区，然后将其显示为缓冲更新的一部分。即使可能:我也不认为这会是一件容易的事情。|3306596|更新|3306597|其他一些回答说这是Windows窗体的一个具体问题。这是不正确的，它实际上是更深层次的，是由Windows+GDI引起的。例如，打开记事本/写字板等，粘贴一大块文本，调整窗口大小，注意到同样的闪烁问题。|3306598|这是几年前我用来做类似事情的一个基本解决方案。它是一个简单的表单，包含一个多行文本框和一个继承自Panel的自定义类。这两个控件具有相同的位置和大小。它在调整大小时使用窗体ResizeBegin和ResizeEnd来显示面板，否则使用textbox。它不是完美的，但它确实消除了闪烁。|3306599|+++public+partial+class+Form1+:+Form
++++{
++++++++public+Form1()
++++++++{
++++++++++++InitializeComponent();
++++++++}

++++++++Bitmap+bm+=+null;

++++++++private+void+textBox1_Resize(object+sender,+EventArgs+e)
++++++++{

++++++++++++Graphics+g+=+textBox1.CreateGraphics();

++++++++++++if+(g.VisibleClipBounds.IsEmpty+==+false)
++++++++++++{
++++++++++++++++bm+=+new+Bitmap((int)g.VisibleClipBounds.Width,+(int)g.VisibleClipBounds.Height);

++++++++++++++++textBox1.DrawToBitmap(bm,+new+Rectangle(0,+0,+(int)g.VisibleClipBounds.Width,+(int)g.VisibleClipBounds.Height));

++++++++++++}

++++++++++++g.Dispose();


++++++++}

++++++++private+void+panelDB1_Paint(object+sender,+PaintEventArgs+e)
++++++++{
++++++++++++if+(bm+!=+null)
++++++++++++{
++++++++++++++++e.Graphics.DrawImageUnscaled(bm,+0,+0,bm.Width,bm.Height+);
++++++++++++}
++++++++}

++++++++private+void+Form1_ResizeBegin(object+sender,+EventArgs+e)
++++++++{
++++++++++++panelDB1.BringToFront();++
++++++++}

++++++++private+void+Form1_ResizeEnd(object+sender,+EventArgs+e)
++++++++{
++++++++++++panelDB1.SendToBack();+++
++++++++}
}

class+PanelDB+:+Panel
{
++++public+PanelDB()
++++{
++++++++this.SetStyle(ControlStyles.AllPaintingInWmPaint+%7C+ControlStyles.UserPaint+%7C+ControlStyles.OptimizedDoubleBuffer,true);+++++++
++++++++//this.DoubleBuffered+=+true;+
++++
++++}

++++protected+override+void+OnPaint(PaintEventArgs+e)
++++{
++++++++base.OnPaint(e);
++++}
}|code-block|syntax|javascript|3306600|entityMap|0|LINK|mutability|MUTABLE|url|https://web.archive.org/web/20140811193726/http://bobpowell.net/doublebuffer.aspx|1|http://www.developmentnow.com/g/30_2006_4_0_0_740077/Resize-flickering-with-transparent-control-help-double-buffering.htm^0|0|0|O|C|0|0|5|C|1|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1F|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1G|8|@]|9|@$F|1H|G|1I|1|1J]]|A|$]]|$1|H|3|I|5|6|7|1K|8|@]|9|@$F|1L|G|1M|1|1N]]|A|$]]|$1|J|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1P|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1T|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1U|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1V|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Z|3|10|5|11|7|1X|8|@]|9|@]|A|$12|13]]|$1|14|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]|1C|$5|17|18|19|A|$1A|1D]]]]

In Windows Forms, the DoubleBuffered property does not affect child controls such as text boxes. Instead it affects just the Form or Panel it is set for.
If you want double-buffering for child elements on a form, you will need to implement manual double-buffering.
Bob Powell has written a <a href="https://web.archive.org/web/20140811193726/http://bobpowell.net/doublebuffer.aspx" rel="nofollow noreferrer">good article</a> (and others) on how to do this.
Also, from a <a href="http://www.developmentnow.com/g/30_2006_4_0_0_740077/Resize-flickering-with-transparent-control-help-double-buffering.htm" rel="nofollow noreferrer">forum answer</a> Bob also says:
<blockquote>
The ownership of a window means that
they will flicker uncontrollably
because you cannot double-buffer
outside of the target windows area. A
panel with child controls cannot be
made to double buffer itself and
it's children for example.
The only way to do this correctly is
to create a single control that does
all the drawing using a form of
retained mode graphics system.
</blockquote>
Therefore, to get flicker-free textbox resize using manual double-buffering you would need to somehow render the textbox to your back buffer and then display it as part of the buffered update. If even possible: I do not expect this would be easy.
[Update]
Some other answers have said this is a problem with Windows Forms specifically. This is not correct, it is actually deeper than that and is caused by Windows GDI. As an example, open Notepad/Wordpad etc. and paste a large chunk of text, resize the window, and notice the same flickering issue.
Here is a basic solution I used years ago to do something similar. It is a simple form containing a multiline textbox and a custom class inheriting from Panel. Both controls have the same location and size. It uses the Forms ResizeBegin and ResizeEnd to show the panel when resizing, and the textbox otherwise. It's not perfect but it does eliminate the flickering.
<pre><code> public partial class Form1 : Form
 {
 public Form1()
 {
 InitializeComponent();
 }

 Bitmap bm = null;

 private void textBox1_Resize(object sender, EventArgs e)
 {

 Graphics g = textBox1.CreateGraphics();

 if (g.VisibleClipBounds.IsEmpty == false)
 {
 bm = new Bitmap((int)g.VisibleClipBounds.Width, (int)g.VisibleClipBounds.Height);

 textBox1.DrawToBitmap(bm, new Rectangle(0, 0, (int)g.VisibleClipBounds.Width, (int)g.VisibleClipBounds.Height));

 }

 g.Dispose();


 }

 private void panelDB1_Paint(object sender, PaintEventArgs e)
 {
 if (bm != null)
 {
 e.Graphics.DrawImageUnscaled(bm, 0, 0,bm.Width,bm.Height );
 }
 }

 private void Form1_ResizeBegin(object sender, EventArgs e)
 {
 panelDB1.BringToFront(); 
 }

 private void Form1_ResizeEnd(object sender, EventArgs e)
 {
 panelDB1.SendToBack(); 
 }
}

class PanelDB : Panel
{
 public PanelDB()
 {
 this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer,true); 
 //this.DoubleBuffered = true; 
 
 }

 protected override void OnPaint(PaintEventArgs e)
 {
 base.OnPaint(e);
 }
}
</code></pre>

blocks|key|330492|text|我通常使用RichTextBox而不是多行TextBox。通过将DetectUrls和ShortcutsEnabled属性设置为false，RTB的行为非常类似于TextBox和...它没有闪烁。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|330493|entityMap^0|5|B|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I usually use a RichTextBox instead of a multiline TextBox.
By setting the DetectUrls- and ShortcutsEnabled-properties to false the RTB behaves very similar to a TextBox and ... it's flicker-free.

blocks|key|3306621|text|函数LockWindow+AS+LONG+CONTROL+SEND+ghDlg，%25TEXT_UPPER，%25WM_SETREDRAW,0,0+CLEARBuffers+END函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3306622|函数UnlockWindow+AS+LONG+ClearBuffers控件发送ghDlg，%25TEXT_UPPER，%25WM_SETREDRAW,1,0+END函数|3306623|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

FUNCTION LockWindow AS LONG
 CONTROL SEND ghDlg, %TEXT_UPPER,%WM_SETREDRAW,0,0
 CLEARBuffers
END FUNCTION

FUNCTION UnlockWindow AS LONG
 ClearBuffers
 CONTROL SEND ghDlg,%TEXT_UPPER,%WM_SETREDRAW,1,0
END FUNCTION

There are plenty of articles addressing flicker in Windows Forms. The majority recommend setting <code>DoubleBuffered = true</code> or setting a bunch of <code>ControlStyle</code> flags. However, none of these help reduce a TextBox flickering.

Here are a couple of related questions:

<ul>
<li><a href="https://stackoverflow.com/questions/76993/how-to-double-buffer-net-controls-on-a-form">How to double buffer .NET controls on a form?</a></li>
<li><a href="https://stackoverflow.com/questions/64272/how-to-eliminate-flicker-in-windows-forms-custom-control-when-scrolling">How to eliminate flicker in Windows.Forms custom control when scrolling?</a></li>
</ul>

To reproduce the issue, create a new WinForms project, add a <code>TextBox</code>, enable multi-line, disable word-wrap, add a bunch of text, set <code>Anchor</code> to Left+Right+Top+Bottom. Now run and resize. The text flickers. For text boxes inside a couple of nested <code>TableLayoutPanel</code>s the flicker on resize is even worse.

Applying the solutions proposed in the above questions at best do not fix the flicker; if I get experimental and set the protected <code>ControlStyle</code> on <code>TextBox</code> I can break it completely (by enabling <code>UserPaint</code>) but not eliminate the flicker.

So, is there any way at all to fix the flickering of the text in a TextBox?

How to prevent a Windows Forms TextBox from flickering on resize?

Windows

有很多关于Windows窗体中的闪烁的文章。大多数人建议设置DoubleBuffered = true或设置一堆ControlStyle标志。然而，这些都不能帮助减少TextBox闪烁。这里有几个相关的问题：要重现这个问题，请创建一个新的WinForms项目，添加一个TextBox，启用多行，禁用自动换行，添加一堆文本...

问如何防止Windows Forms TextBox在调整大小时闪烁？
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