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POMonoTouch Load image in background
 

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    <p>I am having a problem trying to load an image and display it using System.Threading.Task</p> <p>My Code is as follows</p> <pre><code> Task DownloadTask { get; set; } public string Instrument { get; set; } public PriceChartViewController(string Instrument) { this.Instrument = Instrument; DownloadTask = Task.Factory.StartNew(() =&gt; { }); } private void LoadChart(ChartType chartType) { NSData data = new NSData(); DownloadTask = DownloadTask.ContinueWith(prevTask =&gt; { try { UIApplication.SharedApplication.NetworkActivityIndicatorVisible = true; NSUrl nsUrl = new NSUrl(chartType.Uri(Instrument)); data = NSData.FromUrl(nsUrl); } finally { UIApplication.SharedApplication.NetworkActivityIndicatorVisible = false; } }); DownloadTask = DownloadTask.ContinueWith(t =&gt; { UIImage image = new UIImage(data); chartImageView = new UIImageView(image); chartImageView.ContentScaleFactor = 2f; View.AddSubview(chartImageView); this.Title = chartType.Title; }, CancellationToken.None, TaskContinuationOptions.OnlyOnRanToCompletion, TaskScheduler.FromCurrentSynchronizationContext()); } </code></pre> <p>The second Continue with does not seem to be being called?</p> <p>Initially my code looked like the following without the background processing and it worked perfectly.</p> <pre><code> private void oldLoadChart(ChartType chartType) { UIApplication.SharedApplication.NetworkActivityIndicatorVisible = true; NSUrl nsUrl = new NSUrl(chartType.Uri(Instrument)); NSData data = NSData.FromUrl(nsUrl); UIImage image = new UIImage(data); chartImageView = new UIImageView(image); chartImageView.ContentScaleFactor = 2f; View.AddSubview(chartImageView); this.Title = chartType.Title; UIApplication.SharedApplication.NetworkActivityIndicatorVisible = false; } </code></pre> <p>Does anyone know what I am doing wrong?</p>
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    1. USMike U
    1. USMike U
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    1. COPlease add declaration of DownloadTask and it's initialization code.
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      1. USMaxim Korobov
    2. COTask DownloadTask { get; set; } DownloadTask = Task.Factory.StartNew(() => { });
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      1. USMike U
    3. COAdd `catch` before `finally`, maybe you just have an exception so workflow doesn't go any further.
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      1. USfolex
 

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