使用DoubleBuffering和FormBorderStyle.None在Windows10上重画问题 [英] Redraw issue on Windows10 with DoubleBuffering and FormBorderStyle.None

问题描述

我有一个Windows Forms项目问题，我只能在Windows 10机器上重现该问题(在Windows 7上确实可以工作).我认为我可以隔离问题的根源，即，如果我打开双缓冲并将FormBorderStyle设置为None，那么如果我调整大小，例如在事件处理程序中，后台部分和某些控件未重绘.也是如此，有时它会起作用(五分之一).

I have an issue with a Windows Forms project, which I can reproduce only on Windows 10 machine (on Windows 7 it does work). I think that I could isolate the source of issue, namely, if I switch double buffering on and set FormBorderStyle to None, then if I resize the form e.g. in an event handler, the parts of background and some controls being not redrawn. It is also so, that sometimes it works(one time from five).

看起来没有重绘(通常有点不同):

Not redrawn it looks so(often a bit different):

，所以它看起来应该像:

and so it should looks like:

要重现该问题，只需将几个控件放在窗体上(可能数量也很重要)，通过覆盖CreateParams，FormBorderStyle=None启用双重缓冲(使用其他边框样式即可！) .

To reproduce the issue, just put a couple of controls to the form(may be amount can be also important), switch double buffering on via overriding of CreateParams, FormBorderStyle=None (with another border style it works!).

后面的代码:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams cp = base.CreateParams;
            cp.ExStyle |= 0x02000000;  // Turn on WS_EX_COMPOSITED
            return cp;
        }
    }

    private bool small = true;
    private void button1_Click(object sender, EventArgs e)
    {
        //toggle the form's size
        Height = Height + 300*(small?-1:1);
        small = !small;
    }

    private void button5_Click(object sender, EventArgs e)
    {
        Close();
    }
}

问题:
是Windows 10中MS的一个已知错误(或者可能是为了摆脱Windows窗体;))? 有什么想法吗?
双缓冲，没有边界必须是.

Question:
Is it a known bug from MS(or may be intention, to get rid of windows forms ;) ) in Windows 10?
Any ideas?
Double buffering and no border must be.

更新:我有Win 10专业版:1703；内部版本15063.1155.
Update2:在Win 10 Pro版本上进行测试:1709;内部版本16299.492-同样的问题.

Update: I have a Win 10 Pro Version: 1703; Build 15063.1155.
Update2: Test on Win 10 Pro Version: 1709; Build 16299.492 - the same issue.

Update3:在Win 10 Home Version:1803上进行测试-更好的方法(我需要进行几分钟的测试才能重现它)，但是仍然出现问题.该测试是在另一台装有另一张图形卡的计算机上完成的.

Update3: Test on Win 10 Home Version: 1803 - much beter(I needed a couple of minutes of testing to reproduce it), but issue still appears. This test was done on another computer with another graphic card.

解决方法:
恐怕我必须采用这种方法作为解决方法 A:在Windows窗体中删除标题栏并设置FormBorderStyle例如FixedToolWindow.

Workaround:
I'm afraid I have to go this way as workaround A: Remove the title bar in Windows Forms and set FormBorderStyle for instance to FixedToolWindow.

推荐答案

对我来说，这看起来像是操作系统中的错误，但我发现如何在不放弃DoubleBuffering和FormBorderStyle=None的情况下使其工作.

For me it looks like an error in OS, but I have found how to make it work without give up on DoubleBuffering and FormBorderStyle=None.

如果窗口样式将扩展

cp.ExStyle |= 0x00080000;   // Turn on WS_EX_LAYERED

然后一切正常.

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