Save And Retrieve Image File From Stream To Local Storage In Windows Phone 8.1 Runtime Apps

To save and retrieve image file from a stream to local storage in Windows Phone 8.1 Runtime Apps, firstly you need to set the stream to WritableBitmapImage like the following:

var wbm = new WriteableBitmap(600, 800);
await wbm.SetSourceAsync(stream);

Next, here's the code for saving this writable Bitmap Image.

StorageFolder folder = ApplicationData.Current.LocalFolder;
if (folder != null)
{
    StorageFile file = await folder.CreateFileAsync("imagefile" + ".jpg", CreationCollisionOption.ReplaceExisting);
    using(var storageStream = await file.OpenAsync(FileAccessMode.ReadWrite))
    {
        var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, storageStream);
        var pixelStream = wbm.PixelBuffer.AsStream();
        var pixels = new byte[pixelStream.Length];
        await pixelStream.ReadAsync(pixels, 0, pixels.Length);
        encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint) wbm.PixelWidth, (uint) wbm.PixelHeight, 48, 48, pixels);
        await encoder.FlushAsync();
    }
}

To Retrieve this Image Again

string fileName = "imagefile.jpg";
StorageFolder myfolder = ApplicationData.Current.LocalFolder;
BitmapImage bitmapImage = new BitmapImage();
StorageFile file = await myfolder.GetFileAsync(fileName);
var image = await Windows.Storage.FileIO.ReadBufferAsync(file);
Uri uri = new Uri(file.Path);
BitmapImage img = new BitmapImage(new Uri(file.Path));
myimage.Source = img;

Here my image is an image control like the following code snippet:

<Image x:Name="myimage" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Top"/>

It's done. Comment below for any doubt.