如何以编程方式禁用 DWM 并使 Windows 11 中的一个 WinForm 或程序显示 Windows 7 样式的 Windows Basic 窗口标题栏？

Question

在Windows 11中，Windows Basic（非Aero）风格在某些地方仍然存在。该窗体在 Visual Studio 设计器以及 MDI 应用程序中显示时，显示 Windows 7 样式的 Windows Basic 主题。

您可以通过为任何您想要的应用程序启用 Windows XP 兼容模式来使该样式显示在该程序上，并且它将仅显示该程序的 Windows 基本样式。但是，问题是它必须在 XP 兼容模式下运行，并以管理员身份运行。

是否可以通过编程方式仅针对一种表单或程序禁用 DWM/Aero 样式而不启用兼容模式？

我尝试了 P/Invoking

DwmEnableComposition()

，但问题是根据 Microsoft 文档，它不再适用于 Windows 8 及更高版本。而且，即使它有效，它也会禁用整个桌面的 DWM，而不仅仅是一个程序或表单。

Answer 1

DWM

为此公开了一个API：

DwmSetWindowAttribute

，您可以使用它为窗口设置各种属性，其中之一是非客户区渲染策略（

DWMWA_NCRENDERING_POLICY

）。

将

DWMWA_NCRENDERING_POLICY

属性值设置为

DWMNCRP_DISABLED

会禁用

DWM

的非客户端渲染，从而提供您想要的基本窗口样式。

这是示例代码。

using System.ComponentModel;
using System.Runtime.InteropServices;

namespace DisableDWMRendering
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        protected override void OnHandleCreated(EventArgs e)
        {
            base.OnHandleCreated(e);
            DWMNCRENDERINGPOLICY renderingPolicy = DWMNCRENDERINGPOLICY.DWMNCRP_DISABLED;
            int hr;  
            hr = DwmSetWindowAttribute(Handle, DWMWINDOWATTRIBUTE.DWMWA_NCRENDERING_POLICY, renderingPolicy, sizeof(DWMNCRENDERINGPOLICY));
            if (hr != 0)
            {
                throw Marshal.GetExceptionForHR(hr);
            }
        } 
        private enum DWMNCRENDERINGPOLICY
        {
            DWMNCRP_USEWINDOWSTYLE,
            DWMNCRP_DISABLED,
            DWMNCRP_ENABLED,
            DWMNCRP_LAST
        }
        private enum DWMWINDOWATTRIBUTE : uint
        {
            DWMWA_NCRENDERING_ENABLED = 1,              // [get] Is non-client rendering enabled/disabled
            DWMWA_NCRENDERING_POLICY,                   // [set] DWMNCRENDERINGPOLICY - Non-client rendering policy
            DWMWA_TRANSITIONS_FORCEDISABLED,            // [set] Potentially enable/forcibly disable transitions
            DWMWA_ALLOW_NCPAINT,                        // [set] Allow contents rendered in the non-client area to be visible on the DWM-drawn frame.
            DWMWA_CAPTION_BUTTON_BOUNDS,                // [get] Bounds of the caption button area in window-relative space.
            DWMWA_NONCLIENT_RTL_LAYOUT,                 // [set] Is non-client content RTL mirrored
            DWMWA_FORCE_ICONIC_REPRESENTATION,          // [set] Force this window to display iconic thumbnails.
            DWMWA_FLIP3D_POLICY,                        // [set] Designates how Flip3D will treat the window.
            DWMWA_EXTENDED_FRAME_BOUNDS,                // [get] Gets the extended frame bounds rectangle in screen space
            DWMWA_HAS_ICONIC_BITMAP,                    // [set] Indicates an available bitmap when there is no better thumbnail representation.
            DWMWA_DISALLOW_PEEK,                        // [set] Don't invoke Peek on the window.
            DWMWA_EXCLUDED_FROM_PEEK,                   // [set] LivePreview exclusion information
            DWMWA_CLOAK,                                // [set] Cloak or uncloak the window
            DWMWA_CLOAKED,                              // [get] Gets the cloaked state of the window
            DWMWA_FREEZE_REPRESENTATION,                // [set] BOOL, Force this window to freeze the thumbnail without live update
            DWMWA_PASSIVE_UPDATE_MODE,                  // [set] BOOL, Updates the window only when desktop composition runs for other reasons
            DWMWA_USE_HOSTBACKDROPBRUSH,                // [set] BOOL, Allows the use of host backdrop brushes for the window.
            DWMWA_USE_IMMERSIVE_DARK_MODE = 20,         // [set] BOOL, Allows a window to either use the accent color, or dark, according to the user Color Mode preferences.
            DWMWA_WINDOW_CORNER_PREFERENCE = 33,        // [set] WINDOW_CORNER_PREFERENCE, Controls the policy that rounds top-level window corners
            DWMWA_BORDER_COLOR,                         // [set] COLORREF, The color of the thin border around a top-level window
            DWMWA_CAPTION_COLOR,                        // [set] COLORREF, The color of the caption
            DWMWA_TEXT_COLOR,                           // [set] COLORREF, The color of the caption text
            DWMWA_VISIBLE_FRAME_BORDER_THICKNESS,       // [get] UINT, width of the visible border around a thick frame window
            DWMWA_SYSTEMBACKDROP_TYPE,                  // [get, set] SYSTEMBACKDROP_TYPE, Controls the system-drawn backdrop material of a window, including behind the non-client area.
            DWMWA_LAST
            }
        [DllImport("dwmapi.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
        private static extern int DwmGetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, ref DWMNCRENDERINGPOLICY pvAttribute,
        uint cbAttribute);
        [DllImport("dwmapi.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
        private static extern int DwmSetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, in DWMNCRENDERINGPOLICY pvAttribute,
        uint cbAttribute);
    }
}