1 files changed, 94 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla28709.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla28709.cs
new file mode 100644
index 00000000..db67e935
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla28709.cs
@@ -0,0 +1,94 @@
+using System;
+
+using Xamarin.Forms.CustomAttributes;
+using System.Threading.Tasks;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls
+{
+	[Preserve (AllMembers = true)]
+	[Issue (IssueTracker.Bugzilla, 28709, "Application.Properties saving crash ")]
+	public class Bugzilla28709 : TestContentPage // or TestMasterDetailPage, etc ...
+	{
+		protected override void Init ()
+		{
+
+			var btn = new Button () {
+				Text = "Save Properties",
+				HorizontalOptions = LayoutOptions.Center,
+				VerticalOptions = LayoutOptions.Center
+			};
+
+			var btn1 = new Button () {
+				Text = "Save Properties Multiple Threads",
+				HorizontalOptions = LayoutOptions.Center,
+				VerticalOptions = LayoutOptions.Center
+			};
+			btn.Clicked += OnButtonClicked;
+			btn1.Clicked += (sender, e) => {
+				Task.Run(() => {System.Diagnostics.Debug.WriteLine ("thread 1"); OnButtonClicked1("thread1",new EventArgs());});
+				Task.Run(() => {System.Diagnostics.Debug.WriteLine ("thread 2"); OnButtonClicked1("thread2",new EventArgs());});
+				Task.Run(() => {System.Diagnostics.Debug.WriteLine ("thread 3"); OnButtonClicked1("thread3",new EventArgs());});
+
+			};
+			Content = new StackLayout { Children =  { btn, btn1 }};
+		}
+
+		void OnButtonClicked (object sender, EventArgs e)
+		{
+			System.Diagnostics.Debug.WriteLine ($"OnButtonClicked {sender.ToString()}");
+				
+			int j = -1;
+			var properties = Application.Current.Properties;
+			int seed = 13;
+			while (++j < 300) {
+				seed = ((seed * 257) + 41) % 65536;
+				int i = seed % 20;
+
+				int previousClickTotal = -1;
+				if (properties.ContainsKey ("PreviousClickTotal" + i.ToString ()))
+					previousClickTotal = (int)(Application.Current.Properties ["PreviousClickTotal" + i.ToString ()]);
+
+				string clickTotal = "0";
+				if (properties.ContainsKey ("ClickTotal" + i.ToString ()))
+					clickTotal = (string)Application.Current.Properties ["ClickTotal" + i.ToString ()];
+
+				double nextClickTotal = 1.0;
+				if (properties.ContainsKey ("NextClickTotal" + i.ToString ()))
+					nextClickTotal = (double)(Application.Current.Properties ["NextClickTotal" + i.ToString ()]);
+
+				Application.Current.Properties ["PreviousClickTotal" + i.ToString ()] = ++previousClickTotal;
+				Application.Current.Properties ["ClickTotal" + i.ToString ()] = previousClickTotal.ToString ();
+				Application.Current.Properties ["NextClickTotal" + i.ToString ()] = ++nextClickTotal;
+
+				SaveAllProperties ();
+			}
+		}
+
+		async void OnButtonClicked1 (object sender, EventArgs e)
+		{
+			System.Diagnostics.Debug.WriteLine ($"OnButtonClicked {sender.ToString()}");
+			//Application.Current.Properties[sender.ToString()] = 1;
+			await Application.Current.SavePropertiesAsync ();
+			System.Diagnostics.Debug.WriteLine ($"OnButtonClicked {sender.ToString()} done");
+		}
+
+		async void SaveAllProperties ()
+		{
+			await Application.Current.SavePropertiesAsync ();
+		}
+
+
+		#if UITEST
+		[Test]
+		public void Bugzilla28709Test ()
+		{
+			RunningApp.Tap (q => q.Marked ("Save Properties"));
+		}
+#endif
+	}
+}