/// <summary>
/// Saves the RenderTargetBitmap to a png file with a unique file name.
/// </summary>
/// <param name="renderTargetBitmap">The writeable bitmap.</param>
/// <returns>The file the bitmap was saved to.</returns>
public static async Task <StorageFile> SaveToFile(
this RenderTargetBitmap renderTargetBitmap)
{
return(await renderTargetBitmap.SaveToFile(
KnownFolders.PicturesLibrary,
string.Format(
"{0}_{1}.png",
DateTime.Now.ToString("yyyyMMdd_HHmmss_fff"),
Guid.NewGuid()),
CreationCollisionOption.GenerateUniqueName));
}
/// <summary>
/// Saves the RenderTargetBitmap to a file in the given folder with the given file name.
/// </summary>
/// <param name="renderTargetBitmap">The writeable bitmap.</param>
/// <param name="storageFolder">The storage folder.</param>
/// <param name="fileName">Name of the file.</param>
/// <param name="options">
/// The enum value that determines how responds if the fileName is the same
/// as the name of an existing file in the current folder. Defaults to ReplaceExisting.
/// </param>
/// <returns></returns>
public static async Task <StorageFile> SaveToFile(
this RenderTargetBitmap renderTargetBitmap,
StorageFolder storageFolder,
string fileName,
CreationCollisionOption options = CreationCollisionOption.ReplaceExisting)
{
StorageFile outputFile =
await storageFolder.CreateFileAsync(
fileName,
options);
Guid encoderId;
var ext = Path.GetExtension(fileName);
if (new[] { ".bmp", ".dib" }.Contains(ext))
{
encoderId = BitmapEncoder.BmpEncoderId;
}
else if (new[] { ".tiff", ".tif" }.Contains(ext))
{
encoderId = BitmapEncoder.TiffEncoderId;
}
else if (new[] { ".gif" }.Contains(ext))
{
encoderId = BitmapEncoder.GifEncoderId;
}
else if (new[] { ".jpg", ".jpeg", ".jpe", ".jfif", ".jif" }.Contains(ext))
{
encoderId = BitmapEncoder.JpegEncoderId;
}
else if (new[] { ".hdp", ".jxr", ".wdp" }.Contains(ext))
{
encoderId = BitmapEncoder.JpegXREncoderId;
}
else //if (new [] {".png"}.Contains(ext))
{
encoderId = BitmapEncoder.PngEncoderId;
}
await renderTargetBitmap.SaveToFile(outputFile, encoderId);
return(outputFile);
}