WPF 解决 WindowsFormsHost不兼容问题

 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);
 
 
        [System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern IntPtr CreateRectRgn(int x1, int y1, int x2, int y2);
        /// <summary>
        /// 该CombineRgn函数和存储结合了两个地区在第三地区的结果。结合这两个地区是根据指定的模式。
        /// </summary>
        /// <param name="hDestRgn1">处理到一个新的区域与其他区域相结合的两个定义尺寸。 （此区域之前，必须存在CombineRgn被调用。)</param>
        /// <param name="hSrcRgn1">句柄两个区域首先要结合起来。</param>
        /// <param name="hDestRgn2">句柄两个区域的第二个结合起来。</param>
        /// <param name="hSrcRgn2">指定的模式表明这两个地区如何将被合并。这个参数可以是以下值之一。</param>
        /// RGN_AND 	hDestRgn被设置为两个源区域的交集
//RGN_COPY 	hDestRgn被设置为hSrcRgn1的拷贝
//RGN_DIFF 	hDestRgn被设置为hSrcRgn1中与hSrcRgn2不相交的部分
//RGN_OR 	hDestRgn被设置为两个区域的并集
//RGN_XOR 	hDestRgn被设置为除两个源区域OR之外的部分
        /// <returns>句柄</returns>
        [System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern IntPtr CombineRgn(IntPtr hDestRgn1, IntPtr hSrcRgn1, IntPtr hDestRgn2, int hSrcRgn2);
      
        /// <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);
    }

下面的问题就是如何进行操作了，首先在进行嵌入WinForm控件的WPF窗体中添加一个Load事件，在事件中添加如下代码：

           // 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);

原文： http://blog.youkuaiyun.com/wziyx513225244/article/details/6988494

1.1 API常量参考(Constants Reference)

http://www.papazhu.com/post/Constants_Reference.php?page=1&part=7