Initial import

1 files changed, 92 insertions, 0 deletions

diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1851.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1851.cs
new file mode 100644
index 00000000..608bec6f
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1851.cs
@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Xamarin.Forms.CustomAttributes;
+
+namespace Xamarin.Forms.Controls.TestCasesPages
+{
+	[Preserve (AllMembers=true)]
+	[Issue (IssueTracker.Github, 1851, "ObservableCollection in ListView gets Index out of range when removing item", PlatformAffected.Android)]
+	public class Issue1851 : ContentPage
+	{
+		public Issue1851 ()
+		{
+			var grouping = new Grouping<string, string>("number", new List<string> { "1", "2", "3", "4", "5", "6", "7", "8", "9" });
+			var groupings = new ObservableCollection<Grouping<string, string>>
+			{
+				new Grouping<string, string>("letters", new List<string> {"a", "b", "c", "d", "e", "f", "g", "h", "i"}),
+				new Grouping<string, string>("colours", new List<string> {"red", "green", "blue", "white", "orange", "purple", "grey", "mauve", "pink"}),
+				grouping,
+			};
+
+			var listview = new ListView
+			{
+				HasUnevenRows = true,
+				IsGroupingEnabled = true,
+				ItemsSource = groupings,
+				ItemTemplate = new DataTemplate(typeof(CellTemplate)),
+				GroupDisplayBinding = new Binding("Key")
+			};
+			var groupbtn = new Button() { Text = "add/remove group" };
+			bool group = true;
+			groupbtn.Clicked += (sender, args) =>
+			{
+				listview.GroupShortNameBinding = new Binding ("Key");
+				if (group)
+				{
+					group = false;
+
+					// ***** Crashes here
+					groupings.Remove(grouping);
+				}
+				else
+				{
+					group = true;
+					groupings.Add(grouping);
+				}
+			};
+
+			Content = new StackLayout
+			{
+				Children =
+				{
+					groupbtn,
+					listview,
+				}
+			};
+		}
+	}
+
+	public class CellTemplate : ViewCell
+	{
+		protected override void OnBindingContextChanged()
+		{
+			base.OnBindingContextChanged();
+
+			var text = BindingContext as string;
+			if (text == null)
+				return;
+
+			View = new Label { Text = text };
+		}
+	}
+
+	public class Grouping<TKey, TElement> : ObservableCollection<TElement>
+	{
+		public Grouping(TKey key, IEnumerable<TElement> items)
+		{
+			Key = key;
+			foreach (var item in items)
+				Items.Add(item);
+		}
+
+		public TKey Key { get; private set; }
+
+
+	}
+}
+	
\ No newline at end of file