原文:
WPF中不规则窗体与WindowsFormsHost控件的兼容问题完美解决方案
还有就是窗体大小改变之后还要重画圆角窗体，否则出现很不理想的显示效果，添加如下事件代码，解决窗体大小改变的时候，重画窗体的圆角区域：
修改回调函数：
至此问题就全部解决了，如果有朋友有疑问，可以留言，能帮助到你，我很荣幸。
首先先得瑟一下，有关WPF中不规则窗体与WindowsFormsHost控件不兼容的问题，网上给出的解决方案不能满足所有的情况，是有特定条件的，比如 WPF中不规则窗体与WebBrowser控件的兼容问题解决办法。该网友的解决办法也是别出心裁的，为什么这样说呢，你下载了他的程序认真读一下就便知道，他的webBrowser控件的是单独放在一个Form中，让这个Form与WPF中的一个Bord控件进行关联，进行同步移动，但是在移动的时候会出现闪烁，并且还会出现运动的白点，用户体验肯定不好。
OK，绕了一大圈，还是言归正传吧，为什么会出现该问题呢，是什么原因导致在WPF中设置了透明窗体之后，嵌入WinForm中的控件会显示不了呢。一开始我以为是没有正常加载，还要我有UISPY，通过这个软件，我捕获了一下当前运行的程序，发现我在WPF中内嵌的WinForm控件已经加载上了，只是没有看到而已罢了。很郁闷啊。
悲催的程序，头疼啊，是什么原因导致的呢，网上查资料，找到了http://msdn.microsoft.com/zh-cn/library/aa970688.aspx ，让我了解了不少知识。由于项目要用到透明窗体还要制作圆角窗体，说以本来打算不改变WPF中对window的设置，即不改变WindowStyle=“None” 和AllowTransparent = “True”这些设置，想在在WindowsFormsHost上做一些设置，发现这条路走不通。浪费了不少时间。
此路不通只有换思路了，那么把AllowTransparent =“false” ，然后就可以显示，呵呵……当然还要修改啊，WPF的窗体多难看啊，外边有一个边框。怎么搞去啊，怎样办，这也是一个问题啊。想用WPF的特性，悲剧了，好像没有相关的方法啊。
OK，路还是有的，程序员就是来解决办法的，怎么办，只能调用Windows的API，把最外层的那层边框被去掉了。那么需要什么呢，思路是有了，对吧，那么就行动吧，google 和百度一通，发现还真有不少例子，c++的例子最全面，可以参考一下。那么就整理了一下需要这些函数：
SetWindowLong 设置值window的样式
GetWindowLong 获取window的样式
SetWindowRgn 设置window的工作区
CreateRoundRectRgn 创建带有圆角的区域
SetLayeredWindowAttributes 设置层次窗体，进行透明度的设置
直接百度，百科有对他们的详细解释，不过给出的是C++的解释，那么需要你对C++的东西进行转化成C#的东西，有关C#如何调用C++的DLL文件，百度和google中有你想要的答案，我就补多少了，不过要注意类型的转化和字符
集的转化。
下面我把我转化好的函数给大家贴上来，以飨读者。
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);还有就是窗体大小改变之后还要重画圆角窗体，否则出现很不理想的显示效果，添加如下事件代码，解决窗体大小改变的时候，重画窗体的圆角区域：
/// <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);
}PS：有网友在操作的过程中，发现任务栏中不显示右击的系统菜单的问题。
其实这个问题我也遇到过，不过已经修复了该问题。下面贴上如何修复该问题的代码。具体原因，最后分析。
在NativieMethods类中添加如下代码：
/// <summary>
/// 系统菜单
/// </summary>
public const long WS_SYSMENU = 0x00080000L;
该类代码为：
/// <summary>
/// 拖动窗体四角，可以改变窗体的大小
/// </summary>
public class ChangeWindowSize
{
/// <summary>
/// 边框宽度
/// </summary>
private readonly int Thickness = 4;
/// <summary>
/// 改变大小的通知消息
/// </summary>
private const int WMNCHITTEST = 0x0084;
/// <summary>
/// 拐角宽度
/// </summary>
private readonly int angelWidth = 12;
/// <summary>
/// 要改变窗体大小的对象
/// </summary>
private Window window = null;
/// <summary>
/// 鼠标坐标
/// </summary>
private Point mousePoint = new Point();
/// <summary>
/// 构造函数，初始化目标窗体对象
/// </summary>
/// <param name="window">目标窗体</param>
public ChangeWindowSize(Window window)
{
this.window = window;
}
/// <summary>
/// 进行注册钩子
/// </summary>
public void RegisterHook()
{
HwndSource hwndSource = PresentationSource.FromVisual(this.window) as HwndSource;
if (hwndSource != null)
{
hwndSource.AddHook(new HwndSourceHook(this.WndProc));
}
}
/// <summary>
/// 窗体回调程序
/// </summary>
/// <param name="hwnd">窗体句柄</param>
/// <param name="msg">消息</param>
/// <param name="wideParam">附加参数1</param>
/// <param name="longParam">附加参数2</param>
/// <param name="handled">是否处理</param>
/// <returns>返回句柄</returns>
public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wideParam, IntPtr longParam, ref bool handled)
{
switch (msg)
{
case WMNCHITTEST:
this.mousePoint.X = longParam.ToInt32() & 0xFFFF;
this.mousePoint.Y = longParam.ToInt32() >> 16;
// 窗口位置 // 窗口左上角
if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTTOPLEFT);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth) // 窗口左下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMLEFT);
}
else if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth) // 窗口右上角
{
handled = true;
return new IntPtr((int)HitTest.HTTOPRIGHT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth
&& this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth) // 窗口右下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMRIGHT);
}
else if (this.mousePoint.X - this.window.Left <= this.Thickness) // 窗口左侧
{
handled = true;
return new IntPtr((int)HitTest.HTLEFT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.Thickness) // 窗口右侧
{
handled = true;
return new IntPtr((int)HitTest.HTRIGHT);
}
else if (this.mousePoint.Y - this.window.Top <= this.Thickness) // 窗口上方
{
handled = true;
return new IntPtr((int)HitTest.HTTOP);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.Thickness) // 窗口下方
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOM);
}
else // 窗口移动
{
// handled = true;
return new IntPtr((int)HitTest.HTCAPTION);
}
}
return IntPtr.Zero;
}
}
添加成员变量:
/// <summary>
/// 窗口的大小和位置将要被改变时的消息
/// </summary>
private const int WMWINDOWPOSCHANGING = 0x0046;
修改回调函数：
/// <summary>
/// 窗体回调程序
/// </summary>
/// <param name="hwnd">窗体句柄</param>
/// <param name="msg">消息</param>
/// <param name="wideParam">附加参数1</param>
/// <param name="longParam">附加参数2</param>
/// <param name="handled">是否处理</param>
/// <returns>返回句柄</returns>
public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wideParam, IntPtr longParam, ref bool handled)
{
// 获得窗体的 样式
long oldstyle = MedSys.PresentationCore.AdjustWindow.NativeMethods.GetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE);
switch (msg)
{
case WMNCHITTEST:
this.mousePoint.X = longParam.ToInt32() & 0xFFFF;
this.mousePoint.Y = longParam.ToInt32() >> 16;
// 更改窗体的样式为无边框窗体
MedSys.PresentationCore.AdjustWindow.NativeMethods.SetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE, oldstyle & ~MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_CAPTION);
// 窗口位置 // 窗口左上角
if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTTOPLEFT);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth) // 窗口左下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMLEFT);
}
else if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth) // 窗口右上角
{
handled = true;
return new IntPtr((int)HitTest.HTTOPRIGHT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth
&& this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth) // 窗口右下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMRIGHT);
}
else if (this.mousePoint.X - this.window.Left <= this.Thickness) // 窗口左侧
{
handled = true;
return new IntPtr((int)HitTest.HTLEFT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.Thickness) // 窗口右侧
{
handled = true;
return new IntPtr((int)HitTest.HTRIGHT);
}
else if (this.mousePoint.Y - this.window.Top <= this.Thickness) // 窗口上方
{
handled = true;
return new IntPtr((int)HitTest.HTTOP);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.Thickness) // 窗口下方
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOM);
}
else // 窗口移动
{
// handled = true;
// 更改窗体的样式为无边框窗体
return new IntPtr((int)HitTest.HTCAPTION);
}
case WMWINDOWPOSCHANGING:
// 在将要改变的时候，是样式添加系统菜单
MedSys.PresentationCore.AdjustWindow.NativeMethods.SetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE, oldstyle & ~MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_CAPTION | MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_SYSMENU);
break;
}
return IntPtr.Zero;
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
ChangeWindowSize changeWindowSize = new ChangeWindowSize(this);
changeWindowSize.RegisterHook();
}
/// <summary>
/// Resets the max size initialize.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private void ResetMaxSizeInitialize(object sender, EventArgs e)
{
this.MaxWidth = SystemParameters.WorkArea.Width;
this.MaxHeight = SystemParameters.WorkArea.Height;
}
移动窗体的消息和响应系统菜单消息之间产生冲突.
我上述解决的方案策略为：
我采用迂回策略，当开始进行移动的时候，去除系统菜单的样式，这样就不能响应系统菜单的消息。移动完成时，添加系统菜单的样式，这样再去点击任务栏中系统的图标便可以响应系统菜单的消息。
//-----------------------------------------------------------------------
// <copyright file="ChangeWindowSize.cs" company="Vadeware">
// Copyright (c) Vadeware Enterprises. All rights reserved.
// 窗体
// </copyright>
//-----------------------------------------------------------------------
namespace MedSys.PresentationCore.AdjustWindow
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Interop;
/// <summary>
/// 拖动窗体四角，可以改变窗体的大小
/// </summary>
public class ChangeWindowSize
{
/// <summary>
/// 边框宽度
/// </summary>
private readonly int Thickness = 4;
/// <summary>
/// 改变大小的通知消息
/// </summary>
private const int WMNCHITTEST = 0x0084;
/// <summary>
/// 窗口的大小和位置将要被改变时的消息
/// </summary>
private const int WMWINDOWPOSCHANGING = 0x0046;
/// <summary>
/// 拐角宽度
/// </summary>
private readonly int angelWidth = 12;
/// <summary>
/// 要改变窗体大小的对象
/// </summary>
private Window window = null;
/// <summary>
/// 鼠标坐标
/// </summary>
private Point mousePoint = new Point();
/// <summary>
/// 构造函数，初始化目标窗体对象
/// </summary>
/// <param name="window">目标窗体</param>
public ChangeWindowSize(Window window)
{
this.window = window;
}
/// <summary>
/// 进行注册钩子
/// </summary>
public void RegisterHook()
{
HwndSource hwndSource = PresentationSource.FromVisual(this.window) as HwndSource;
if (hwndSource != null)
{
hwndSource.AddHook(new HwndSourceHook(this.WndProc));
}
}
/// <summary>
/// 窗体回调程序
/// </summary>
/// <param name="hwnd">窗体句柄</param>
/// <param name="msg">消息</param>
/// <param name="wideParam">附加参数1</param>
/// <param name="longParam">附加参数2</param>
/// <param name="handled">是否处理</param>
/// <returns>返回句柄</returns>
public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wideParam, IntPtr longParam, ref bool handled)
{
// 获得窗体的 样式
int oldstyle = MedSys.PresentationCore.AdjustWindow.NativeMethods.GetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE);
switch (msg)
{
case WMNCHITTEST:
this.mousePoint.X = longParam.ToInt32() & 0xFFFF;
this.mousePoint.Y = longParam.ToInt32() >> 16;
// 更改窗体的样式为无边框窗体
MedSys.PresentationCore.AdjustWindow.NativeMethods.SetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE, oldstyle & ~MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_CAPTION);
// 窗口位置 // 窗口左上角
if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTTOPLEFT);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth
&& this.mousePoint.X - this.window.Left <= this.angelWidth) // 窗口左下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMLEFT);
}
else if (this.mousePoint.Y - this.window.Top <= this.angelWidth
&& this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth) // 窗口右上角
{
handled = true;
return new IntPtr((int)HitTest.HTTOPRIGHT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.angelWidth
&& this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.angelWidth) // 窗口右下角
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMRIGHT);
}
else if (this.mousePoint.X - this.window.Left <= this.Thickness) // 窗口左侧
{
handled = true;
return new IntPtr((int)HitTest.HTLEFT);
}
else if (this.window.ActualWidth + this.window.Left - this.mousePoint.X <= this.Thickness) // 窗口右侧
{
handled = true;
return new IntPtr((int)HitTest.HTRIGHT);
}
else if (this.mousePoint.Y - this.window.Top <= this.Thickness) // 窗口上方
{
handled = true;
return new IntPtr((int)HitTest.HTTOP);
}
else if (this.window.ActualHeight + this.window.Top - this.mousePoint.Y <= this.Thickness) // 窗口下方
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOM);
}
else // 窗口移动
{
// handled = true;
// 更改窗体的样式为无边框窗体
return new IntPtr((int)HitTest.HTCAPTION);
}
case WMWINDOWPOSCHANGING:
// 在将要改变的时候，是样式添加系统菜单
MedSys.PresentationCore.AdjustWindow.NativeMethods.SetWindowLong(hwnd, MedSys.PresentationCore.AdjustWindow.NativeMethods.GWL_STYLE, oldstyle & ~MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_CAPTION | MedSys.PresentationCore.AdjustWindow.NativeMethods.WS_SYSMENU);
break;
}
return IntPtr.Zero;
}
}
}
//-----------------------------------------------------------------------
// <copyright file="NativeMethods.cs" company="Vadeware">
// Copyright (c) Vadeware Enterprises. All rights reserved.
// windows 函数的借口接口函数
// </copyright>
namespace MedSys.PresentationCore.AdjustWindow
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
/// <summary>
/// 主窗体内部类
/// </summary>
public class NativeMethods
{
/// <summary>
/// 带有外边框和标题的windows的样式
/// </summary>
public const int WS_CAPTION = 0X00C0000;
/// <summary>
/// 系统菜单
/// </summary>
public const int WS_SYSMENU = 0x00080000;
/// <summary>
/// window 扩展样式 分层显示
/// </summary>
public const int WS_EX_LAYERED = 0x00080000;
/// <summary>
/// 带有alpha的样式
/// </summary>
public const int LWA_ALPHA = 0x00000002;
/// <summary>
/// 颜色设置
/// </summary>
public const int LWA_COLORKEY = 0x00000001;
/// <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, int 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 int 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, uint colorKey, byte alpha, int flags);
}
}
____2012年08月05日11点05分修改__添加Vs2008的Demo_____________________________________
应网友的要求，现将DMEO奉上。
该Demo为Framework3.5的，在Vs2008下执行没有问题。
Demo下载连接:http://download.csdn.net/detail/wziyx513225244/4477441
感谢网友：huyunsuo 对我支持
____2012年09月21日17点36分修改__添加Vs2010的Demo_____________________________________
应网友的要求，现将DMEO奉上。
该Demo为Framework4.0的，在Vs2010下执行没有问题。
链接（收您1分，请您体谅和尊重原创）：http://download.csdn.net/detail/wziyx513225244/4585821
感谢网友给出的解决方法和对此问题的关注。首先感谢mikejodden 给出的修改建议，以及 llhccyc 对该问题质疑。
同样感谢其他人的关注。谢谢你们的关注。我将做的更好。
至此问题就全部解决了，如果有朋友有疑问，可以留言，能帮助到你，我很荣幸。
请尊重作者的劳动果实，支持转载，请注明博客的出处。谢谢。
