public override void ShowError(string message)
{
base.ShowError(message);
this._currentImageTask = null;
this._currentStringTask = null;
}
public void DownloadImage(string uri, Action onFinished)
{
// return immideately if the image is cached
var cachedImage = this.GetCachedImage(uri);
if (cachedImage.IsCached)
{
onFinished();
return;
}
if (this._runningImageTasks.Contains(uri))
{
return;
}
this._runningImageTasks.Add(uri);
// download image
var httpGet = new HttpGetImageTask(uri, image => this.OnImageDownloaded(uri, image, onFinished));
httpGet.OnError = error => this.OnError(uri, error, onFinished);
httpGet.Execute();
}
private void LoadCaptcha(string key)
{
string imageUrl = string.Format("http://i.captcha.yandex.net/image?key={0}", key);
this._currentImageTask = new HttpGetImageTask(imageUrl, this.OnImageDownloaded);
this._currentImageTask.OnError = this.ShowError;
this._currentImageTask.Execute();
}
private void OnImageDownloaded(BitmapSource bitmap)
{
this.DisplayImage(bitmap);
this.HideLoading();
this._currentImageTask = null;
}