public static ImageSource FromResource(string resource)
{
ImageSource imageSource;
WeakReference<ImageSource> imageSourceWr;
if (!ImageSourceWrCache.TryGetValue(resource, out imageSourceWr) ||
!imageSourceWr.TryGetTarget(out imageSource))
{
var imgArrayLazyTask = new Lazy<Task<byte[]>>(
async () =>
{
var assembly = typeof(ImageSourceEx).GetTypeInfo().Assembly;
using (var inputStream = assembly.GetManifestResourceStream(resource))
using (var outputStream = new MemoryStream())
{
await inputStream.CopyToAsync(outputStream);
return outputStream.ToArray();
}
},
isThreadSafe: true);
imageSource = new StreamImageSource() { Stream = async _ => new MemoryStream(await imgArrayLazyTask.Value) };
ImageSourceWrCache[resource] = new WeakReference<ImageSource>(imageSource);
}
return imageSource;
}
public async Task InitializeAsync()
{
//Using the built-in FileImageSource would be much less code than manually creating
//a StreamImageSource. However, the FileImageSource doesn't appear to release the
//lock on the file that it displays, so attempting to delete the file causes an
//"Access Denied" error in the UWP app. So here we copy the file into memory and
//immediately dispose the FileStream.
var file = await FileSystem.Current.GetFileFromPathAsync(FileReference.FileName);
byte[] fileBytes;
using (var fileStream = await file.OpenAsync(FileAccess.Read))
{
fileBytes = new byte[fileStream.Length];
fileStream.Read(fileBytes, 0, (int)(fileStream.Length));
}
Func<System.Threading.CancellationToken, Task<System.IO.Stream>> getStreamFunc =
ct => Task.FromResult((System.IO.Stream)(new System.IO.MemoryStream(fileBytes)));
ImageSource = new StreamImageSource() { Stream = getStreamFunc };
}
async void OnPickPhotoButtonClicked(object sender, EventArgs e)
{
(sender as Button).IsEnabled = false;
Xamarin.Forms.Image image = new Image();
Stream stream = await DependencyService.Get <CameraInterface>().GetImageStreamAsync();
if (stream != null)
{
image.Source = ImageSource.FromStream(() => stream);
if (image.Source is Xamarin.Forms.StreamImageSource)
{
Xamarin.Forms.StreamImageSource objFileImageSource = (Xamarin.Forms.StreamImageSource)image.Source;
//
// Access the file that was specified:-
string strFileName = objFileImageSource.ToString();
}
}
(sender as Button).IsEnabled = true;
}
private async Task<Stream> GetStreamFromImageSourceAsync(StreamImageSource imageSource, CancellationToken canellationToken = default(CancellationToken))
{
if (imageSource.Stream != null)
{
return await imageSource.Stream(canellationToken);
}
return null;
}