$csCode = @'//https://social.msdn.microsoft.com/Forums/en-US/0d4737a9-639c-4648-b437-6fcbaee5c2ae/how-do-i-set-the-wallpaper-background-image-per-desktop-monitor?forum=csharpgeneral//https://devblogs.microsoft.com/oldnewthing/20140314-00/?p=1503//https://stackoverflow.com/questions/334630/opening-a-folder-in-explorer-and-selecting-a-file/334645//https://github.com/catwalkagogo/CW.Win32/blob/master/CW.Win32/Shell/ShellItemArray.csusing System;using System.Runtime.InteropServices;public class Wallpaper{    IDesktopWallpaper pDesktopWallpaper = null;    IShellItemArray ppsiItemArray = null;        public Wallpaper()    {        pDesktopWallpaper = (IDesktopWallpaper)(new DesktopWallpaperClass());    }    [StructLayout(LayoutKind.Sequential)]                                     public struct RECT                                                        {                                                                             public int left;                                                          public int top;                                                           public int right;                                                         public int bottom;                                                                                                                                  public RECT(int left, int top, int right, int bottom)                     {                                                                             this.left = left;                                                         this.top = top;                                                           this.right = right;                                                       this.bottom = bottom;                                                 }                                                                     }        [ComImport()]    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]    [Guid("b63ea76d-1f85-456f-a19c-48159efa858b")]    public interface IShellItemArray    {    }        [ComImport()]    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]    [Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE")]    public interface IShellItem    {    }        [ComImport]    [Guid("B92B56A9-8B55-4E14-9A89-0199BBB6F93B")]    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]    interface IDesktopWallpaper    {        HRESULT SetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string monitorID, [MarshalAs(UnmanagedType.LPWStr)] string wallpaper);        HRESULT GetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string monitorID, [MarshalAs(UnmanagedType.LPWStr)] ref string wallpaper);        HRESULT GetMonitorDevicePathAt(uint monitorIndex, [MarshalAs(UnmanagedType.LPWStr)] ref string monitorID);        HRESULT GetMonitorDevicePathCount(ref uint count);        HRESULT GetMonitorRECT([MarshalAs(UnmanagedType.LPWStr)] string monitorID, [MarshalAs(UnmanagedType.Struct)] ref RECT displayRect);        HRESULT SetBackgroundColor(uint color);        HRESULT GetBackgroundColor(ref uint color);        HRESULT SetPosition(DESKTOP_WALLPAPER_POSITION position);        HRESULT GetPosition(ref DESKTOP_WALLPAPER_POSITION position);        HRESULT SetSlideshow(IShellItemArray items);        HRESULT GetSlideshow(ref IShellItemArray items);        HRESULT SetSlideshowOptions(DESKTOP_SLIDESHOW_OPTIONS options, uint slideshowTick);        [PreserveSig]        HRESULT GetSlideshowOptions(out DESKTOP_SLIDESHOW_OPTIONS options, out uint slideshowTick);        HRESULT AdvanceSlideshow([MarshalAs(UnmanagedType.LPWStr)] string monitorID, DESKTOP_SLIDESHOW_DIRECTION direction);        HRESULT GetStatus(out DESKTOP_SLIDESHOW_STATE state);        HRESULT Enable(bool benable);    }        public enum DESKTOP_WALLPAPER_POSITION    {        DWPOS_CENTER = 0,        DWPOS_TILE = 1,        DWPOS_STRETCH = 2,        DWPOS_FIT = 3,        DWPOS_FILL = 4,        DWPOS_SPAN = 5    }        public enum DESKTOP_SLIDESHOW_OPTIONS    {        DSO_SHUFFLEIMAGES = 0x1    }        public enum DESKTOP_SLIDESHOW_STATE    {        DSS_ENABLED = 0x1,        DSS_SLIDESHOW = 0x2,        DSS_DISABLED_BY_REMOTE_SESSION = 0x4    }        public enum DESKTOP_SLIDESHOW_DIRECTION    {        DSD_FORWARD = 0,        DSD_BACKWARD = 1    }           [ComImport, Guid("C2CF3110-460E-4fc1-B9D0-8A1C0C9CC4BD")]    public class DesktopWallpaperClass    {    }        public enum HRESULT : int    {        S_OK = 0,        S_FALSE = 1,        E_NOINTERFACE = unchecked((int)0x80004002),        E_NOTIMPL = unchecked((int)0x80004001),        E_FAIL = unchecked((int)0x80004005)    }    [DllImport("shell32.dll", SetLastError = true)]    public static extern void SHParseDisplayName([MarshalAs(UnmanagedType.LPWStr)] string name, IntPtr bindingContext, [Out] out IntPtr pidl, uint sfgaoIn, [Out] out uint psfgaoOut);        [DllImport("shell32.dll", SetLastError = true)]    public static extern int SHCreateShellItemArrayFromIDLists(int cidl, IntPtr[] rgpidl, out IShellItemArray ppsiItemArray);    //===========================================================================================================================    public void SetSlideshow(string folderPath)    {        uint psfgaoOut;        var ptrList = new IntPtr[1];        SHParseDisplayName(folderPath, IntPtr.Zero, out ptrList[0], 0, out psfgaoOut);        SHCreateShellItemArrayFromIDLists(1, ptrList, out ppsiItemArray);        pDesktopWallpaper.SetSlideshow(ppsiItemArray);    }    public void SetSlideshowOptions(uint shuffle, uint milliseconds)    {        pDesktopWallpaper.SetSlideshowOptions((DESKTOP_SLIDESHOW_OPTIONS)shuffle, milliseconds);    }    public void SetWallpaper(string filePath)    {        string monitorID = null;        pDesktopWallpaper.GetMonitorDevicePathAt(0, ref monitorID);        pDesktopWallpaper.SetWallpaper(monitorID, filePath);    }    public void SetPosition(uint position)    {        pDesktopWallpaper.SetPosition((DESKTOP_WALLPAPER_POSITION)position);    }    public string GetWallpaper()    {        string monitorID = null;        string filePath = null;        pDesktopWallpaper.GetMonitorDevicePathAt(0, ref monitorID);        pDesktopWallpaper.GetWallpaper(monitorID, ref filePath);        return filePath;    }    public void Enable(bool benable)    {        pDesktopWallpaper.Enable(benable);    }    public uint GetSlideshowOptions()    {        DESKTOP_SLIDESHOW_OPTIONS options;        uint slideshowTick;        pDesktopWallpaper.GetSlideshowOptions(out options, out slideshowTick);        return slideshowTick;    }    public uint GetStatus()    {        DESKTOP_SLIDESHOW_STATE state;        pDesktopWallpaper.GetStatus(out state);        return (uint)state;    }}'@Add-Type -TypeDefinition $csCode$o = [Wallpaper]::new()

设定桌布

$o.SetWallpaper('C:\new\img0.jpg')

设定桌布(幻灯片)

$o.SetSlideshow('C:\picFolder')#第一个参数：0 按照顺序;  1 打乱顺序#第二个参数：图片变更间隔 milliseconds$o.SetSlideshowOptions(1, 10000)

其他设定

#显示方式#0:CENTER; 1:TILE; 2:STRETCH; 3:FIT; 4:FILL; 5:SPAN$o.SetPosition(0)#0:关闭桌布; 1:启用桌布$o.Enable(0)

别的设定桌布方法

$Pic = "C:\new\img0.jpg"$FolderPath = Split-Path  $Pic$FileName   = Split-Path  $pic  -Leaf$Shell = new-object -com "shell.application"$File = $Shell.NameSpace($FolderPath).ParseName($FileName)#WallpaperStyle#并排0而且TileWallpaper要设  1#置中0#延展2#全萤幕6#填满10Set-ItemProperty 'HKCU:\Control Panel\Desktop' -Name "WallpaperStyle" -Value "0"Set-ItemProperty 'HKCU:\Control Panel\Desktop' -Name "TileWallpaper" -Value "0"$File.verbs()   |  ?{  $_.name -like  "*(&B)"  } | %{ $_.doit()   }# For 英文版 Windows#$File.verbs()   |  ?{  $_.name -like  "Set as desktop &background"  } | %{ $_.doit()   }sleep 2

参考资料：
How do I set the wallpaper / background image per Desktop / Monitor?
How do I create an IShellItemArray from a bunch of file paths? - The Old New Thing
c# - Opening a folder in explorer and selecting a file - Stack Overflow
CW.Win32/ShellItemArray.cs at master · catwalkagogo/CW.Win32 · GitHub