WPF中设置无边框窗体似乎是要将WindowStyle设置为None，AllowTransparency=true，这样才能达到WinForm中无边框窗体的样式。

但是AllowTransparency=true后WPF性能会大大降低，动画很卡。无奈只好关闭；

仅设置WindowStyle为None，似乎达不到理想效果，还是有边框：

立刻想到可以通过API修改窗体风格：SetWindowLong
网上查阅资料，发现去掉了WS_CATION = 0x00C00000L 似乎还是没有效果，看到别人的文章，发现WS_CATION = 0x00C0000L，
两个值不一样，于是全部用上，SetWindowLong(hWnd, GWL_STYLE, oldstyle & (~(0x00C00000L  |0x00C0000L)));
终于成功了

真正的无边框窗体，因为公司做触屏程序，需要这样的效果。
将wziyx513225244的文章中封装的类修改了一下，http://blog.csdn.net/wziyx513225244/article/details/6988494
直接一个函数设置风格就OK了。感谢wziyx513225244。

相信很多人应该都会遇到这个问题，贴出来供大家用：

public class NativeMethods{/// <summary> /// 带有外边框和标题的windows的样式 /// </summary> public const long WS_CAPTION = 0x00C00000L;public const long WS_CAPTION_2 = 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;public const long WS_CHILD = 0x40000000L;/// <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);//=================================================================================/// <summary>/// 设置窗体为无边框风格/// </summary>/// <param name="hWnd"></param>public static void SetWindowNoBorder(IntPtr hWnd){long oldstyle = NativeMethods.GetWindowLong(hWnd, NativeMethods.GWL_STYLE);SetWindowLong(hWnd, GWL_STYLE, oldstyle & (~(WS_CAPTION | WS_CAPTION_2)));//SetWindowLong(hWnd, GWL_EXSTYLE, WS_CHILD);}}