windows系统桌面壁纸切换的三种csharp办法，兼容win10及旧版，还有一个现成桌面小程序

/// <summary>         /// 调用外部切换壁纸的方法         /// </summary>         /// <param name="uAction"></param>         /// <param name="uParam"></param>         /// <param name="lpvParam"></param>         /// <param name="fuWinIni"></param>         /// <returns></returns>         [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]         public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni); 

public class ActiveDesktopCom     {         /// <summary>         /// 壁纸的显示方式         /// </summary>         public enum WPSTYLE         {             /// <summary>             /// 居中             /// </summary>             CENTER = 0,             /// <summary>             /// 平铺             /// </summary>             TILE = 1,             /// <summary>             /// 拉伸             /// </summary>             STRETCH = 2,             /// <summary>             /// 适应             /// </summary>             adapt = 3,             /// <summary>             /// 填充             /// </summary>             FILL = 4,             /// <summary>             /// 跨区             /// </summary>             Transregional = 5,         }          struct WALLPAPEROPT         {             public int dwSize;             public WPSTYLE dwStyle;         }          struct COMPONENTSOPT         {             public int dwSize;             [MarshalAs(UnmanagedType.Bool)]             public bool fEnableComponents;             [MarshalAs(UnmanagedType.Bool)]             public bool fActiveDesktop;         }          struct COMPPOS         {             public const int COMPONENT_TOP = 0x3FFFFFFF;             public const int COMPONENT_DEFAULT_LEFT = 0xFFFF;             public const int COMPONENT_DEFAULT_TOP = 0xFFFF;              public int dwSize;             public int iLeft;             public int iTop;             public int dwWidth;             public int dwHeight;             public int izIndex;             [MarshalAs(UnmanagedType.Bool)]             public bool fCanResize;             [MarshalAs(UnmanagedType.Bool)]             public bool fCanResizeX;             [MarshalAs(UnmanagedType.Bool)]             public bool fCanResizeY;             public int iPreferredLeftPercent;             public int iPreferredTopPercent;         }          [Flags]         enum ITEMSTATE         {             NORMAL = 0x00000001,             FULLSCREEN = 00000002,             SPLIT = 0x00000004,             VALIDSIZESTATEBITS = NORMAL | SPLIT | FULLSCREEN,             VALIDSTATEBITS = NORMAL | SPLIT | FULLSCREEN | unchecked((int)0x80000000) | 0x40000000         }          struct COMPSTATEINFO         {             public int dwSize;             public int iLeft;             public int iTop;             public int dwWidth;             public int dwHeight;             public int dwItemState;         }          enum COMP_TYPE         {             HTMLDOC = 0,             PICTURE = 1,             WEBSITE = 2,             CONTROL = 3,             CFHTML = 4,             MAX = 4         }          [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]         struct COMPONENT         {             private const int INTERNET_MAX_URL_LENGTH = 2084;   //   =                                                                    // INTERNET_MAX_SCHEME_LENGTH   (32)   +   "://".Length   +                                                                    // INTERNET_MAX_PATH_LENGTH   (2048)                public int dwSize;             public int dwID;             public COMP_TYPE iComponentType;             [MarshalAs(UnmanagedType.Bool)]             public bool fChecked;             [MarshalAs(UnmanagedType.Bool)]             public bool fDirty;             [MarshalAs(UnmanagedType.Bool)]             public bool fNoScroll;             public COMPPOS cpPos;             [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]             public string wszFriendlyName;             [MarshalAs(UnmanagedType.ByValTStr, SizeConst = INTERNET_MAX_URL_LENGTH)]             public string wszSource;             [MarshalAs(UnmanagedType.ByValTStr, SizeConst = INTERNET_MAX_URL_LENGTH)]             public string wszSubscribedURL;  #if AD_IE5     public   int   dwCurItemState;        public   COMPSTATEINFO   csiOriginal;        public   COMPSTATEINFO   csiRestored;    #endif         }          enum DTI_ADTIWUI         {             DTI_ADDUI_DEFAULT = 0x00000000,             DTI_ADDUI_DISPSUBWIZARD = 0x00000001,             DTI_ADDUI_POSITIONITEM = 0x00000002,         }          [Flags]         enum AD_APPLY         {             SAVE = 0x00000001,             HTMLGEN = 0x00000002,             REFRESH = 0x00000004,             ALL = SAVE | HTMLGEN | REFRESH,             FORCE = 0x00000008,             BUFFERED_REFRESH = 0x00000010,             DYNAMICREFRESH = 0x00000020         }          [Flags]         enum COMP_ELEM         {             TYPE = 0x00000001,             CHECKED = 0x00000002,             DIRTY = 0x00000004,             NOSCROLL = 0x00000008,             POS_LEFT = 0x00000010,             POS_TOP = 0x00000020,             SIZE_WIDTH = 0x00000040,             SIZE_HEIGHT = 0x00000080,             POS_ZINDEX = 0x00000100,             SOURCE = 0x00000200,             FRIENDLYNAME = 0x00000400,             SUBSCRIBEDURL = 0x00000800,             ORIGINAL_CSI = 0x00001000,             RESTORED_CSI = 0x00002000,             CURITEMSTATE = 0x00004000,             ALL = TYPE | CHECKED | DIRTY | NOSCROLL | POS_LEFT | SIZE_WIDTH |                 SIZE_HEIGHT | POS_ZINDEX | SOURCE |                 FRIENDLYNAME | POS_TOP | SUBSCRIBEDURL | ORIGINAL_CSI |                 RESTORED_CSI | CURITEMSTATE         }          [Flags]         enum ADDURL         {             SILENT = 0x0001         }          [             ComImport(),             Guid("F490EB00-1240-11D1-9888-006097DEACF9"),             InterfaceType(ComInterfaceType.InterfaceIsIUnknown)         ]         interface IActiveDesktop         {             void ApplyChanges(AD_APPLY dwFlags);             void GetWallpaper([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszWallpaper, int cchWallpaper, int dwReserved);             void SetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string pwszWallpaper, int dwReserved);             void GetWallpaperOptions(ref WALLPAPEROPT pwpo, int dwReserved);             void SetWallpaperOptions([In] ref WALLPAPEROPT pwpo, int dwReserved);             void GetPattern([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszPattern, int cchPattern, int dwReserved);             void SetPattern([MarshalAs(UnmanagedType.LPWStr)] string pwszPattern, int dwReserved);             void GetDesktopItemOptions(ref COMPONENTSOPT pco, int dwReserved);             void SetDesktopItemOptions([In] ref COMPONENTSOPT pco, int dwReserved);             void AddDesktopItem([In] ref COMPONENT pcomp, int dwReserved);             void AddDesktopItemWithUI(IntPtr hwnd, [In] ref COMPONENT pcomp, DTI_ADTIWUI dwFlags);             void ModifyDesktopItem([In] ref COMPONENT pcomp, COMP_ELEM dwFlags);             void RemoveDesktopItem([In] ref COMPONENT pcomp, int dwReserved);             void GetDesktopItemCount(out int lpiCount, int dwReserved);             void GetDesktopItem(int nComponent, ref COMPONENT pcomp, int dwReserved);             void GetDesktopItemByID(IntPtr dwID, ref COMPONENT pcomp, int dwReserved);             void GenerateDesktopItemHtml([MarshalAs(UnmanagedType.LPWStr)] string pwszFileName, [In] ref COMPONENT pcomp, int dwReserved);             void AddUrl(IntPtr hwnd, [MarshalAs(UnmanagedType.LPWStr)] string pszSource, [In] ref COMPONENT pcomp, ADDURL dwFlags);             void GetDesktopItemBySource([MarshalAs(UnmanagedType.LPWStr)] string pwszSource, ref COMPONENT pcomp, int dwReserved);         }          [             ComImport(),             Guid("75048700-EF1F-11D0-9888-006097DEACF9")         ]         class ActiveDesktop   /*   :   IActiveDesktop   */   { }         public class OLE32DLL         {             [DllImport("ole32.dll", SetLastError = true)]             public static extern int CoUninitialize();              [DllImport("ole32.dll", SetLastError = true)]             public static extern int CoInitialize(int pvReserved);              [DllImport("ole32.dll", CharSet = CharSet.Unicode)]             public static extern int CLSIDFromString(string lpsz, out Guid pclsid);              [DllImport("ole32.dll", ExactSpelling = true, PreserveSig = false)]             [return: MarshalAs(UnmanagedType.Interface)]             public static extern object CoCreateInstance(                 [In, MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,                 int pUnkOuter,                 int dwClsContext,                 [In, MarshalAs(UnmanagedType.LPStruct)] Guid riid             );         }         /// <summary>         /// 兼容win7版本以前版本系统的修改壁纸         /// </summary>         /// <param name="filename"></param>         /// <returns></returns>         public static bool SetActiveDesktop(string filename, WPSTYLE dwstyle = WPSTYLE.FILL)         {             try             {                 const int NULL = 0;                 const int S_OK = 0;                 const int CLSCTX_ALL = 23;                  Guid IID_IActiveDesktop = new Guid("F490EB00-1240-11D1-9888-006097DEACF9");                 Guid CLSID_ActiveDesktop = new Guid("75048700-EF1F-11D0-9888-006097DEACF9");                  if (System.Threading.Thread.CurrentThread.GetApartmentState() != System.Threading.ApartmentState.STA && OLE32DLL.CoInitialize(NULL) < S_OK)                     throw new Exception("Failed to initialize COM library.");                 //object ppvObject = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_ALL, IID_IActiveDesktop);                 //ActiveDesktop ad = new ActiveDesktop();                 object ad = OLE32DLL.CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_ALL, IID_IActiveDesktop);                 IActiveDesktop iad = (IActiveDesktop)ad;                 if (iad != null)                 {                     //WPSTYLE_CENTER 居中 0                     //WPSTYLE_TILE 平铺 1                     //WPSTYLE_STRETCH 拉伸 2                      //WPSTYLE dwstyle = WPSTYLE.FILL;//这里调整显示背景图片样式                     WALLPAPEROPT wp = new WALLPAPEROPT();                     wp.dwSize = System.Runtime.InteropServices.Marshal.SizeOf(wp);                     wp.dwStyle = dwstyle;                     iad.SetWallpaperOptions(ref wp, 0);                     iad.SetWallpaper(filename, 0);                     iad.ApplyChanges(AD_APPLY.ALL);//AD_APPLY.ALL);                     //System.Runtime.InteropServices.Marshal.ReleaseComObject(ad);                     //ad = null;                 }                 OLE32DLL.CoUninitialize();                 return true;             }             catch             {                 return false;             }         }     } 

/// <summary>     /// 使用IDesktopWallpaper方式切换壁纸的方法     /// </summary>     public class DesktopWallpaperCom     {         [ComImport]         [Guid("B92B56A9-8B55-4E14-9A89-0199BBB6F93B")]         [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]         public interface IDesktopWallpaper         {             void SetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string monitorID, [MarshalAs(UnmanagedType.LPWStr)] string wallpaper);              [return: MarshalAs(UnmanagedType.LPWStr)]             string GetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string monitorID);              [return: MarshalAs(UnmanagedType.LPWStr)]             string GetMonitorDevicePathAt(uint monitorIndex);              [return: MarshalAs(UnmanagedType.U4)]             uint GetMonitorDevicePathCount();              [return: MarshalAs(UnmanagedType.Struct)]             Rect GetMonitorRECT([MarshalAs(UnmanagedType.LPWStr)] string monitorID);              void SetBackgroundColor([MarshalAs(UnmanagedType.U4)] uint color);              [return: MarshalAs(UnmanagedType.U4)]             uint GetBackgroundColor();              void SetPosition([MarshalAs(UnmanagedType.I4)] DesktopWallpaperPosition position);              [return: MarshalAs(UnmanagedType.I4)]             DesktopWallpaperPosition GetPosition();              void SetSlideshow(IntPtr items);              IntPtr GetSlideshow();              void SetSlideshowOptions(DesktopSlideshowDirection options, uint slideshowTick);              void GetSlideshowOptions(out DesktopSlideshowDirection options, out uint slideshowTick);              void AdvanceSlideshow([MarshalAs(UnmanagedType.LPWStr)] string monitorID, [MarshalAs(UnmanagedType.I4)] DesktopSlideshowDirection direction);              DesktopSlideshowDirection GetStatus();              bool Enable();         }          [ComImport]         [Guid("C2CF3110-460E-4fc1-B9D0-8A1C0C9CC4BD")]         public class DesktopWallpaper         {         }          [Flags]         public enum DesktopSlideshowOptions         {             None = 0,             ShuffleImages = 0x01         }          [Flags]         public enum DesktopSlideshowState         {             None = 0,             Enabled = 0x01,             Slideshow = 0x02,             DisabledByRemoteSession = 0x04         }          public enum DesktopSlideshowDirection         {             Forward = 0,             Backward = 1         }          public enum DesktopWallpaperPosition         {             Center = 0,             Tile = 1,             Stretch = 2,             Fit = 3,             Fill = 4,             Span = 5,         }          [StructLayout(LayoutKind.Sequential)]         public struct Rect         {             public int Left;             public int Top;             public int Right;             public int Bottom;         }         /// <summary>         /// 获取所有的显示器的ID，用于在设置壁纸中用到的显示器的id         /// </summary>         /// <returns></returns>         public static string[] GetDeskMonitorIds()         {             try             {                 DesktopWallpaper ad = new DesktopWallpaper();                 IDesktopWallpaper iad = (IDesktopWallpaper)ad;                 List<string> mids = new List<string>();                 if (iad != null)                 {                     for (uint i = 0; i < iad.GetMonitorDevicePathCount(); i++)                     {                         mids.Add(iad.GetMonitorDevicePathAt(i));                     }                 }                 System.Runtime.InteropServices.Marshal.ReleaseComObject(ad);                 ad = null;                 return mids.ToArray();             }             catch             {                 return null;             }         }         /// <summary>         /// 新版的win8以上版本调用修改桌面的方法         /// </summary>         /// <param name="filename"></param>         /// <returns></returns>         public static bool SetDesktopWallpaper(string filename, string mid = null)         {             try             {                 DesktopWallpaper ad = new DesktopWallpaper();                 IDesktopWallpaper iad = (IDesktopWallpaper)ad;                 if (iad != null)                 {                     iad.SetWallpaper(mid ?? string.Empty, filename);                 }                 System.Runtime.InteropServices.Marshal.ReleaseComObject(ad);                 ad = null;                 return true;             }             catch             {                 return false;             }         }     }