wpf 设置标题栏颜色

要在WPF应用程序中设置标题栏颜色，你可以使用以下代码：

1. 首先，添加以下命名空间：

using System.Windows.Interop;
using System.Runtime.InteropServices;

2. 接着，在你的窗口类中添加以下方法：

private void SetWindowTitleBarColor(Color color)
{
    var hwnd = new WindowInteropHelper(this).Handle;
    var accent = new AccentPolicy();
    accent.AccentState = AccentState.ACCENT_ENABLE_BLURBEHIND;
    accent.AccentFlags = 0x20 | 0x40 | 0x80 | 0x100;
    accent.GradientColor = (color.R << 16) | (color.G << 8) | color.B;
    var accentStructSize = Marshal.SizeOf(accent);
    var accentPtr = Marshal.AllocHGlobal(accentStructSize);
    Marshal.StructureToPtr(accent, accentPtr, false);
    var data = new WindowCompositionAttributeData();
    data.Attribute = WindowCompositionAttribute.WCA_ACCENT_POLICY;
    data.SizeOfData = accentStructSize;
    data.Data = accentPtr;
    SetWindowCompositionAttribute(hwnd, ref data);
    Marshal.FreeHGlobal(accentPtr);
}

[DllImport("user32.dll")]
internal static extern int SetWindowCompositionAttribute(IntPtr hwnd, ref WindowCompositionAttributeData data);

[StructLayout(LayoutKind.Sequential)]
public struct AccentPolicy
{
    public AccentState AccentState;
    public int AccentFlags;
    public int GradientColor;
    public int AnimationId;
}

public enum AccentState
{
    ACCENT_DISABLED = 0,
    ACCENT_ENABLE_GRADIENT = 1,
    ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
    ACCENT_ENABLE_BLURBEHIND = 3,
    ACCENT_ENABLE_ACRYLICBLURBEHIND = 4,
    ACCENT_INVALID_STATE = 5
}

public enum WindowCompositionAttribute
{
    WCA_UNDEFINED = 0,
    WCA_NCRENDERING_ENABLED = 1,
    WCA_NCRENDERING_POLICY = 2,
    WCA_TRANSITIONS_FORCEDISABLED = 3,
    WCA_ALLOW_NCPAINT = 4,
    WCA_CAPTION_BUTTON_BOUNDS = 5,
    WCA_NONCLIENT_RTL_LAYOUT = 6,
    WCA_FORCE_ICONIC_REPRESENTATION = 7,
    WCA_EXTENDED_FRAME_BOUNDS = 8,
    WCA_HAS_ICONIC_BITMAP = 9,
    WCA_THEME_ATTRIBUTES = 10,
    WCA_NCRENDERING_EXILED = 11,
    WCA_NCADORNMENTINFO = 12,
    WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
    WCA_VIDEO_OVERLAY_ACTIVE = 14,
    WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
    WCA_DISALLOW_PEEK = 16,
    WCA_CLOAK = 17,
    WCA_CLOAKED = 18,
    WCA_ACCENT_POLICY = 19,
    WCA_FREEZE_REPRESENTATION = 20,
    WCA_EVER_UNCLOAKED = 21,
    WCA_VISUAL_OWNER = 22,
    WCA_LAST = 23
}

[StructLayout(LayoutKind.Sequential)]
public struct WindowCompositionAttributeData
{
    public WindowCompositionAttribute Attribute;
    public IntPtr Data;
    public int SizeOfData;
}

3. 最后，在窗口的构造函数中调用 `SetWindowTitleBarColor` 方法，并传递一个 `Color` 类型的参数，如下所示：

public MainWindow()
{
    InitializeComponent();
    SetWindowTitleBarColor(Colors.Blue);
}

这将设置标题栏的颜色为蓝色。你可以使用任何有效的 `Color` 对象来设置颜色。