Merge pull request #60 from xamarin/warnings-WP8-4014

Turn off suppression of warning CS4014
Port TaskExtensions from WinRT projects to WP8
Update implementation of OpenUriAction to use TaskExtensions

1 files changed, 33 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.WP8/TaskExtensions.cs b/Xamarin.Forms.Platform.WP8/TaskExtensions.cs
new file mode 100644
index 00000000..51f275d7
--- /dev/null
+++ b/Xamarin.Forms.Platform.WP8/TaskExtensions.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Windows.Foundation;
+
+namespace Xamarin.Forms
+{
+	internal static class TaskExtensions
+	{
+		public static void WatchForError(this IAsyncAction self)
+		{
+			self.AsTask().WatchForError();
+		}
+
+		public static void WatchForError<T>(this IAsyncOperation<T> self)
+		{
+			self.AsTask().WatchForError();
+		}
+
+		public static void WatchForError(this Task self)
+		{
+			SynchronizationContext context = SynchronizationContext.Current;
+			if (context == null)
+				return;
+
+			self.ContinueWith(t => {
+				                       Exception exception = t.Exception.InnerExceptions.Count > 1 ? t.Exception : t.Exception.InnerException;
+
+				                       context.Post(e => { throw (Exception)e; }, exception);
+			}, CancellationToken.None, TaskContinuationOptions.OnlyOnFaulted, TaskScheduler.Default);
+		}
+	}
+}
\ No newline at end of file