Change desktop wallpaper using code in .NET

Question

How can I change the desktop wallpaper using C# Code?

Answer 1

Here's a class yanked from an app I wrote a year or two ago:

public sealed class Wallpaper {     Wallpaper() { }      const int SPI_SETDESKWALLPAPER = 20;     const int SPIF_UPDATEINIFILE = 0x01;     const int SPIF_SENDWININICHANGE = 0x02;      [DllImport("user32.dll", CharSet = CharSet.Auto)]     static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);      public enum Style : int     {         Tiled,         Centered,         Stretched     }      public static void Set(Uri uri, Style style)     {         System.IO.Stream s = new System.Net.WebClient().OpenRead(uri.ToString());          System.Drawing.Image img = System.Drawing.Image.FromStream(s);         string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");         img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp);          RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);         if (style == Style.Stretched)         {             key.SetValue(@"WallpaperStyle", 2.ToString());             key.SetValue(@"TileWallpaper", 0.ToString());         }          if (style == Style.Centered)         {             key.SetValue(@"WallpaperStyle", 1.ToString());             key.SetValue(@"TileWallpaper", 0.ToString());         }          if (style == Style.Tiled)         {             key.SetValue(@"WallpaperStyle", 1.ToString());             key.SetValue(@"TileWallpaper", 1.ToString());         }          SystemParametersInfo(SPI_SETDESKWALLPAPER,             0,             tempPath,             SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);     } } 

I haven't tested it extensively, so use at your own risk.

Answer 2

Bases on this useful answer, I've also made my own app to set wallpaper matching screen resolution.

But the registry settings were wrong. Here are the correct values (tested on Win 7, Win 8.1, Win 10).

if (style == Style.Fill) {     key.SetValue(@"WallpaperStyle", 10.ToString());     key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Fit) {     key.SetValue(@"WallpaperStyle", 6.ToString());     key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Span) // Windows 8 or newer only! {     key.SetValue(@"WallpaperStyle", 22.ToString());     key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Stretch) {     key.SetValue(@"WallpaperStyle", 2.ToString());     key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Tile) {     key.SetValue(@"WallpaperStyle", 0.ToString());     key.SetValue(@"TileWallpaper", 1.ToString()); } if (style == Style.Center) {     key.SetValue(@"WallpaperStyle", 0.ToString());     key.SetValue(@"TileWallpaper", 0.ToString()); }