Grid exception only on IOS

Question

hi all,i'm using your last release and i hjave a bug just on IOS with the grid.can you check this please?- $exception {System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.Generic.List`1+Enumerator[T].MoveNextRare () [0x00013] in :0 at System.Collections.Generic.List`1+Enumerator[T].MoveNext () [0x0004a] in :0 at Syncfusion.SfDataGrid.XForms.VisualContainer.ArrangeRows () [0x00a7b] in :0 at Syncfusion.SfDataGrid.XForms.VisualContainer.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00000] in :0 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Syncfusion.SfDataGrid.XForms.VisualContainer.OnSizeAllocated (System.Double width, System.Double height) [0x0054f] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:157 at Syncfusion.SfDataGrid.XForms.ExtendedScrollView.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00121] in :0 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Syncfusion.SfDataGrid.XForms.ExtendedScrollView.OnSizeAllocated (System.Double width, System.Double height) [0x0000e] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.Layout.ForceLayout () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:107 at Syncfusion.SfDataGrid.XForms.VisualContainer.OnSizeAllocated (System.Double width, System.Double height) [0x004f7] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.Layout.ForceLayout () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:107 at Syncfusion.SfDataGrid.XForms.GridColumnSizer.RefreshColumnSizer (System.Double viewSize) [0x000cf] in :0 at Syncfusion.SfDataGrid.XForms.RowGenerator.ApplyColumnSizer (System.Double viewSize) [0x0000b] in :0 at Syncfusion.SfDataGrid.XForms.VisualContainer.OnSizeAllocated (System.Double width, System.Double height) [0x001e2] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:157 at Syncfusion.SfDataGrid.XForms.ExtendedScrollView.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00121] in :0 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Syncfusion.SfDataGrid.XForms.ExtendedScrollView.OnSizeAllocated (System.Double width, System.Double height) [0x0000e] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Syncfusion.SfDataGrid.XForms.SfDataGrid.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x000e3] in :0 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Syncfusion.SfDataGrid.XForms.SfDataGrid.OnSizeAllocated (System.Double width, System.Double height) [0x0001f] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:157 at Xamarin.Forms.Grid.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00150] in D:\a\1\s\Xamarin.Forms.Core\GridCalc.cs:43 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:157 at Xamarin.Forms.ScrollView.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x000f8] in D:\a\1\s\Xamarin.Forms.Core\ScrollView.cs:237 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.View child, Xamarin.Forms.Rectangle region, Xamarin.Forms.SizeRequest childSizeRequest) [0x00225] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:291 at Xamarin.Forms.StackLayout.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00081] in D:\a\1\s\Xamarin.Forms.Core\StackLayout.cs:65 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00158] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:239 at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:203 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:157 at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:296 at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000ca] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:375 at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:355 at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:872 at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1104 at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:411 at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:781 at Xamarin.Forms.Platform.iOS.PageRenderer.SetElementSize (Xamarin.Forms.Size size) [0x0004a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:150 at Xamarin.Forms.Platform.iOS.ModalWrapper.ViewDidLayoutSubviews () [0x00006] in D:\a\1\s\Xamarin.Forms.Platform.iOS\ModalWrapper.cs:108 at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr) at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00013] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:69 at TestApp.iOS.Application.Main (System.String[] args) [0x00001] in D:\Dev\Updater\TestApp\TestApp.iOS\Main.cs:17 } System.InvalidOperationException

Suja Venkatesan · Answer

Hi Alberto, 

Thank you for contacting Syncfusion support. 

We checked the reported issue “Grid Exception only on iOS” in simple sample with Datagrid but unfortunately we are unable to reproduce the issue in our end. We are unclear about the scenario in which you are facing this exception (For example : Either on initial loading or while making any interagtion in the SfDataGrid). The sample we have used to check this issue is available in the following link for your reference. 

Sample Link: https://www.syncfusion.com/downloads/support/forum/169563/ze/GettingStarted-961116417.zip 

Please have a look at this sample and let us know if you are facing the same issue in this same too. If not revert to us with a modified sample to reproduce the issue or provide the below mentioned details. 


All the XAML and C# code snippet related to SfDataGrid
Video illustration of the issue, if possible.
Share scenario when exception gets thrown.
 
Please revert to us with all the above requested details. It will be more helpful for us to find the exact cause for the issue and prompt solution at earlier. 

Additional Information: 
Tested Device: VisualStudio Emulator(iPhone-8 (iOS-14.4)) 
SfDataGrid version: 19.3.0.44 Xamarin.Forms version: 5.0.0.2125.

Luca · Answer

hi,the issue start from here (just on IOS, android works)thanksgrid.QueryRowHeight += DataGrid_QueryRowHeight;private void DataGrid_QueryRowHeight(object sender, QueryRowHeightEventArgs e)        {var tab = sender as SfDataGrid;            if (tab.View.Records.Count == 0 && e.RowIndex == 0)             tab.HeightRequest = e.Height;             else             if (e.RowIndex == 1)             tab.HeightRequest = e.Height * (tab.View.Records.Count + 1);}

Suja Venkatesan · Answer

Hi Luca, 

Sorry for the inconvenience caused. 

We would like to let you know that we are able to reproduce the reported issue in our end. We are currently validating this. We are in need of two more business days to validate this properly. We will update the further detail on October 19, 2021. We appreciate your patience until then. 

Regards, Suja

Suja Venkatesan · Answer

Hi Luca, 

Thanks for your patience. 

We have suspect you tried to set the Height for the SfDatagrid based on the row count. You can achieve your requirement by setting height to the datagrid in SfDatagrid loaded event as like below code snippet. 

Code Snippet: 




datagrid.GridLoaded += Datagrid_GridLoaded; 
private void Datagrid_GridLoaded(object sender, GridLoadedEventArgs e){var tab = sender as SfDataGrid;if (tab.View.Records.Count == 0){tab.HeightRequest = tab.RowHeight;}elsetab.HeightRequest = tab.RowHeight * (tab.View.Records.Count + 1); 
} 

The QueryRowHeight event will be fired each time a row comes into view and we are unclear about your usecase. Can you please explain in details about your usecase, setting the  Height for the Datagrid inside the QueryRowHeight event. It will be more helpful for us to provide a prompt solution at earlier. 

Regards, 
Suja.