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

问题描述

我有一个 Windows 窗体项目的问题，我只能在 Windows 10 机器上重现它(在 Windows 7 上它确实有效).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，那么如果我调整表单的大小，例如在事件处理程序中，不重绘背景部分和一些控件.也是如此，有时它会起作用(五次中的一次).

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).

没有重绘它看起来如此(通常有点不同):

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

所以它应该看起来像:

要重现该问题，只需在表单上添加几个控件(可能数量也很重要)，通过覆盖 CreateParams、FormBorderStyle=None<来打开双缓冲/code> (它可以使用另一种边框样式！).

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:
Windows 10 中是否是 MS 的已知错误(或者可能是有意摆脱 Windows 窗体；))?
有什么想法吗?
双缓冲且无边框必须.

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:我有一个 Win 10 Pro 版本:1703；构建 15063.1155.
Update2: 在 Win 10 Pro 版本上测试:1709；构建 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.

更新 3: 在 Win 10 家庭版上测试:1803 - 好多了(我需要几分钟的测试才能重现它)，但问题仍然存在.此测试是在另一台使用另一张显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:
恐怕我必须这样做作为解决方法A:删除Windows窗体中的标题栏并设置FormBorderStyle 以 FixedToolWindow 为例.

推荐答案

对我来说这看起来像是操作系统中的一个错误，但我已经找到了如何在不放弃 DoubleBuffering 和 DoubleBuffering 的情况下让它工作代码>FormBorderStyle=None.

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.

如果窗口样式将被扩展

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

然后一切都按预期工作.

then all works as expected.

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