本文实例讲述了WPF设置窗体可以使用鼠标拖动大小的方法。分享给大家供大家参考。具体实现方法如下：
{
// 获取窗体句柄
IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;
// 获得窗体的 样式
int 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);
}</div>
NativeMethods.cs的代码：
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SEsoft
{
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>
/// 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>
&nb