如果 DPI 发生变化，如何正确地将标签与文本框对齐？

我已在我的配置文件中启用了这些推荐设置：

<add key="DpiAware" value="true" />
<add key="DpiAwareness" value="PerMonitorV2" />
<add key="EnableWindowsFormsHighDpiAutoResizing" value="true" />

也在主函数中：

Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

一切都位于顶部和左侧锚定位置，这就是它在 100% 缩放显示屏上的外观：

当我将窗口移动到 150% 或 175% 缩放显示时：

如您所见，标签向下偏移几个像素。

容器的AutoScaleMode被设定为DPI.

如何保持对齐？

我遇到了同样的问题，经过一番挖掘后，我得到了这个控件，它可以用来代替标签。已知问题：单击时，聚焦的控件会失去焦点。这可以在 TableLayoutPanel 中使用，也可以独立使用。

public class LabelTextBox : System.Windows.Forms.TextBox
{
    private const int WM_NCPAINT = 0x85;
    private const int WM_SETFOCUS = 0x07;
    private const int WM_ENABLE = 0x0A;
    private const int WM_SETCURSOR = 0x20;

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        // https://www.pinvoke.net/default.aspx/Structures/RECT.html
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct POINT
    {
        // https://www.pinvoke.net/default.aspx/Structures/POINT.html
    }

    public LabelTextBox()
    {
        // Disable some TextBox interactions, so it is intact as the Label
        this.ReadOnly = true;
        this.TabStop = false;
    }

    [DllImport("user32")]
    private static extern IntPtr GetWindowDC(IntPtr hwnd);
    
    [DllImport("user32")]
    private static extern bool GetClientRect(IntPtr hwnd, out RECT rectangle);
    
    [DllImport("user32")]
    private static extern bool GetWindowRect(IntPtr hwnd, out RECT rectangle);

    [DllImport("user32.dll")]
    static extern bool ClientToScreen(IntPtr hWnd, ref POINT lpPoint);

    protected override void WndProc(ref Message m)
    {
        // Disable some TextBox interactions, so it is intact as the Label
        if (m.Msg == WM_SETFOCUS || m.Msg == WM_ENABLE || m.Msg == WM_SETCURSOR)
            return;

        // When the boreder should be painted
        if (m.Msg == WM_NCPAINT)
        {
            // Get the rect of the client area in the screen coordinates.
            var clientOrigin = new POINT(0, 0);
            ClientToScreen(Handle, ref clientOrigin);
            GetClientRect(Handle, out var clientRect);
            clientRect.X = clientOrigin.X;
            clientRect.Y = clientOrigin.Y;

            // Get the rect of the window area in the screen coordinates.
            GetWindowRect(Handle, out var windowRect);

            // Calculate the rect of the client area in the window coordinates.
            // This will be our clipping area, because we want to paint only the border.
            var clip = new Rectangle(
                clientRect.Left - windowRect.Left,
                clientRect.Top - windowRect.Top,
                clientRect.Width,
                clientRect.Height
                );

            // Get the Graphics, set the clip and fill with the BackColor.
            var dc = GetWindowDC(Handle);
            using (Graphics g = Graphics.FromHdc(dc))
            {
                g.SetClip(clip, CombineMode.Exclude);
                g.FillRectangle(new SolidBrush(BackColor), 0, 0, windowRect.Width, windowRect.Height);
            }
            
            return;
        }

        base.WndProc(ref m);
    }
}

结果：

100 %

200 %

我通过 TableLayoutPanel 中那些糟糕的解决方案得出了这个结论：

1. 垂直居中——对齐相当稳定，但无法对齐基线。
2. 通过填充进行微调 - 在较高 DPI 上仍然不够稳定。
3. 使用无边框文本框代替标签 - 无边框文本框的对齐方式与标签相同。

该解决方案的灵感来自于：

1. https://stackoverflow.com/a/27027829/2408668
2. https://stackoverflow.com/a/74106039/2408668