WPF中不规则窗体与WindowsFormsHost控件兼容问题的解决方法

public class NativeMethods
{
    /// <summary>
    /// 带有外边框和标题的windows的样式
    /// </summary>
    public const long WS_CAPTION = 0X00C0000L;
 
    // public const long WS_BORDER = 0X0080000L;
 
    /// <summary>
    /// window 扩展样式 分层显示
    /// </summary>
    public const long WS_EX_LAYERED = 0x00080000L;
 
    /// <summary>
    /// 带有alpha的样式
    /// </summary>
    public const long LWA_ALPHA = 0x00000002L;
 
    /// <summary>
    /// 颜色设置
    /// </summary>
    public const long LWA_COLORKEY = 0x00000001L;
 
    /// <summary>
    /// window的基本样式
    /// </summary>
    public const int GWL_STYLE = -16;
 
    /// <summary>
    /// window的扩展样式
    /// </summary>
    public const int GWL_EXSTYLE = -20;
 
    /// <summary>
    /// 设置窗体的样式
    /// </summary>
    /// <param name="handle">操作窗体的句柄</param>
    /// <param name="oldStyle">进行设置窗体的样式类型.</param>
    /// <param name="newStyle">新样式</param>
    [System.Runtime.InteropServices.DllImport("User32.dll")]
    public static extern void SetWindowLong(IntPtr handle, int oldStyle, long newStyle);
 
    /// <summary>
    /// 获取窗体指定的样式.
    /// </summary>
    /// <param name="handle">操作窗体的句柄</param>
    /// <param name="style">要进行返回的样式</param>
    /// <returns>当前window的样式</returns>
    [System.Runtime.InteropServices.DllImport("User32.dll")]
    public static extern long GetWindowLong(IntPtr handle, int style);
 
    /// <summary>
    /// 设置窗体的工作区域.
    /// </summary>
    /// <param name="handle">操作窗体的句柄.</param>
    /// <param name="handleRegion">操作窗体区域的句柄.</param>
    /// <param name="regraw">if set to <c>true</c> [regraw].</param>
    /// <returns>返回值</returns>
    [System.Runtime.InteropServices.DllImport("User32.dll")]
    public static extern int SetWindowRgn(IntPtr handle, IntPtr handleRegion, bool regraw);
 
    /// <summary>
    /// 创建带有圆角的区域.
    /// </summary>
    /// <param name="x1">左上角坐标的X值.</param>
    /// <param name="y1">左上角坐标的Y值.</param>
    /// <param name="x2">右下角坐标的X值.</param>
    /// <param name="y2">右下角坐标的Y值.</param>
    /// <param name="width">圆角椭圆的width.</param>
    /// <param name="height">圆角椭圆的height.</param>
    /// <returns>hRgn的句柄</returns>
    [System.Runtime.InteropServices.DllImport("gdi32.dll")]
    public static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int width, int height);
 
    /// <summary>
    /// Sets the layered window attributes.
    /// </summary>
    /// <param name="handle">要进行操作的窗口句柄</param>
    /// <param name="colorKey">RGB的值</param>
    /// <param name="alpha">Alpha的值，透明度</param>
    /// <param name="flags">附带参数</param>
    /// <returns>true or false</returns>
    [System.Runtime.InteropServices.DllImport("User32.dll")]
    public static extern bool SetLayeredWindowAttributes(IntPtr handle, ulong colorKey, byte alpha, long flags);
}

// 获取窗体句柄
 IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;
 
 // 获得窗体的 样式
 long oldstyle = NativeMethods.GetWindowLong(hwnd, NativeMethods.GWL_STYLE);
 
 // 更改窗体的样式为无边框窗体
 NativeMethods.SetWindowLong(hwnd, NativeMethods.GWL_STYLE, oldstyle & ~NativeMethods.WS_CAPTION);
 
 // SetWindowLong(hwnd, GWL_EXSTYLE, oldstyle & ~WS_EX_LAYERED);
 // 1 | 2 << 8 | 3 << 16  r=1,g=2,b=3 详见winuse.h文件
 // 设置窗体为透明窗体
 NativeMethods.SetLayeredWindowAttributes(hwnd, 1 | 2 << 8 | 3 << 16, 0, NativeMethods.LWA_ALPHA);
 
 // 创建圆角窗体  12 这个值可以根据自身项目进行设置
 NativeMethods.SetWindowRgn(hwnd, NativeMethods.CreateRoundRectRgn(0, 0, Convert.ToInt32(this.ActualWidth), Convert.ToInt32(this.ActualHeight), 12, 12), true);

/// <summary>
/// Handles the SizeChanged event of the DesktopShell control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.SizeChangedEventArgs"/> instance containing the event data.</param>
private void DesktopShell_SizeChanged(object sender, SizeChangedEventArgs e)
{
    // 获取窗体句柄
    IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;
 
    // 创建圆角窗体
    NativeMethods.SetWindowRgn(hwnd,NativeMethods.CreateRoundRectRgn(0, 0, Convert.ToInt32(this.ActualWidth), Convert.ToInt32(this.ActualHeight), 12, 12), true);
}