将PNG转换为JPG Windows Phone

Question

i have a PNG file and i would convert into JPG The PNG is a large size(high resolution) (for example 30/40MB)

if i use this code receive a memory leak

using (var fileStream = myIsolatedStorage.OpenFile("1.png",FileMode.Open,FileAccess.Read))
{
    WriteableBitmap wb = PictureDecoder.DecodeJpeg(fileStream);
}

How to? Thanks

Answer 1

Your code cannot work since you loaded a png file, but the method beneath accepts jpeg stream. You can do the following>

1. Open the png file with OpenFile
2. Load the file into a BitmapImage
3. Create a WriteableBitmap from that BitmapImage
4. Save the created WriteableBitmap as a jpeg file using the SaveJpeg extension method.