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diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla27642.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla27642.cs
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+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla27642.cs
@@ -0,0 +1,178 @@
+´╗┐using System;
+
+using Xamarin.Forms.CustomAttributes;
+using System.Text;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls
+{
+ [Preserve (AllMembers = true)]
+ [Issue (IssueTracker.Bugzilla, 27642, "[Windows Phone] Adding a ScrollView control to a ContentView, remove it and re-add it will cause an exception on Windows Phone")]
+ public class Bugzilla27642 : TestContentPage // or TestMasterDetailPage, etc ...
+ {
+ ContentView _mainContent;
+ protected override void Init ()
+ {
+ var rootGrid = new Grid {
+ RowDefinitions = new RowDefinitionCollection
+ {
+ new RowDefinition { Height = new GridLength(1, GridUnitType.Star) },
+ new RowDefinition { Height = new GridLength(1, GridUnitType.Auto) },
+ },
+ };
+
+
+ _mainContent = new ContentView { Content = new ScrollView { Content = new Label { Text = Description } } };
+ rootGrid.AddChild (_mainContent, 0, 0);
+
+
+ var buttons = new StackLayout { Orientation = StackOrientation.Horizontal };
+
+ var button1A = new Button { Text = "View 1A" };
+ button1A.Clicked += (sender, args) => ShowView (_view1A);
+ buttons.Children.Add (button1A);
+
+ var button1B = new Button { Text = "View 1B" };
+ button1B.Clicked += (sender, args) => ShowView (_view1B);
+ buttons.Children.Add (button1B);
+
+ var button2 = new Button { Text = "View 2" };
+ button2.Clicked += (sender, args) => ShowView (_view2);
+ buttons.Children.Add (button2);
+
+ rootGrid.AddChild (buttons, 0, 1);
+
+
+ Content = rootGrid;
+ }
+
+ const string Description = "A view containing a ScrollView cannot be re-used (same instance, Singleton) \n\n\n"
+ + "Steps to reproduce: \n\n" + "View1a contains a ScrollView \n"
+ + "Click: View1A -> View2 -> View1A => Exception\n\n"
+ + "View1b also contains a ScrollView, but its Content (including ScrollView!) will be re-generated during activation.\n"
+ + "Click: View1B -> View2 -> View1B => Exception\n\n"
+ + "View2 doesn't contain a ScrollView and therefore can be called again without problems.\n\n"
+ + "The Error-Message-View contains a ScrollView, too but will be re-created every time.";
+
+ readonly View1A _view1A = new View1A (); // always same instance, simulates Singleton from IoC
+ readonly View1B _view1B = new View1B (); // -"-
+ readonly View2 _view2 = new View2 (); // -"-
+
+ void ShowView (ExtendedContentView view)
+ {
+ try {
+ view.Activating (); // implemented only for View1B
+ _mainContent.Content = view;
+ }
+ catch (Exception ex) {
+ _mainContent.Content = new ErrorView (ex);
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ public class ExtendedContentView : ContentView
+ {
+ public virtual void Activating ()
+ {
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ public class View1A : ExtendedContentView
+ {
+ public View1A ()
+ {
+
+ BackgroundColor = Color.Olive;
+ var scrollView = new ScrollView ();
+ var sb = new StringBuilder ();
+ for (var i = 0; i < 100; i++)
+ sb.Append ("View 1a with ScrollView +++ ");
+
+ var label = new Label { Text = sb.ToString (), HorizontalOptions = LayoutOptions.Center, VerticalOptions = LayoutOptions.Center, XAlign = TextAlignment.Center, };
+
+ scrollView.Content = label;
+
+ Content = scrollView;
+
+ }
+
+ }
+
+ [Preserve (AllMembers = true)]
+ public class View1B : ExtendedContentView
+ {
+ public View1B ()
+ {
+ BackgroundColor = Color.Navy;
+ }
+
+ public override void Activating ()
+ {
+ var scrollView = new ScrollView ();
+ var sb = new StringBuilder ();
+ for (var i = 0; i < 50; i++)
+ sb.Append ("View 1b with ScrollView and recreation of content +++++ ");
+
+ var label = new Label { Text = sb.ToString (), HorizontalOptions = LayoutOptions.Center, VerticalOptions = LayoutOptions.Center, XAlign = TextAlignment.Center, };
+
+ scrollView.Content = label;
+
+ Content = scrollView;
+
+ }
+ }
+
+ public class View2 : ExtendedContentView
+ {
+ public View2 ()
+ {
+ BackgroundColor = Color.Teal;
+ Content = new Label { Text = "View 2", HorizontalOptions = LayoutOptions.Center, VerticalOptions = LayoutOptions.Center, XAlign = TextAlignment.Center, };
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ public class ErrorView : ExtendedContentView
+ {
+ public ErrorView (Exception ex)
+ {
+ BackgroundColor = Color.Maroon;
+ Content = new ScrollView { Content = new Label { Text = ex.ToString () } };
+ }
+ }
+
+ }
+
+ public static class GridExtension
+ {
+ public static void AddChild (this Grid grid, View view, int column, int row, int columnspan = 1, int rowspan = 1)
+ {
+ if (row < 0) {
+ throw new ArgumentOutOfRangeException ("row");
+ }
+ if (column < 0) {
+ throw new ArgumentOutOfRangeException ("column");
+ }
+ if (rowspan <= 0) {
+ throw new ArgumentOutOfRangeException ("rowspan");
+ }
+ if (columnspan <= 0) {
+ throw new ArgumentOutOfRangeException ("columnspan");
+ }
+ if (view == null) {
+ throw new ArgumentNullException ("view");
+ }
+
+ Grid.SetRow (view, row);
+ Grid.SetRowSpan (view, rowspan);
+ Grid.SetColumn (view, column);
+ Grid.SetColumnSpan (view, columnspan);
+ grid.Children.Add (view);
+ }
+ }
+}