ItemsSource doesn't contains the provided item

[Emil]

Hi,

I can understand the exception below. when raising an item which isnt in the ItemSource, it throws exception but I am not sure if this is the correct way of handling this mistake. Because  this exception can happen for complicated scenarios like using multiple listviews or Twoway binding, UI to UI binding. It is hard to predict this exception is coming for complex UIs. I believe that instead of throwing this exception, you should simply do "No Action", but if it is throwing this exception, It causes App to crash and this reduces productivity. Please consider not throwing an exception here. For example, xamarin forms listview wont throw exception if SelectedItem is not in the list.

thanks,

Emil

System.InvalidOperationException

ItemsSource doesn't contains the provided item

  at Syncfusion.ListView.XForms.SfListView.OnSelectedItemChanged (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x0008c] in <dc1c0f4b4b8c459fb0d77f182b2319af>:0 
  at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x0011b] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindableObject.cs:597 
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0015b] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindableObject.cs:391 
  at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x001f9] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:174 
  at Xamarin.Forms.BindingExpression.Apply (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property) [0x0006b] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:77 
  at Xamarin.Forms.Binding.Apply (System.Object newContext, Xamarin.Forms.BindableObject bindObj, Xamarin.For

[Dinesh Babu Yadav]

Hi Emil, 

 

Sorry for the inconvenience. 

 

The reported issue “Internal Exception throws when SelectedItem data does not contain in ItemsSource in SfListView” can be resolved by catching the bind property in ViewModel to SelectedItem. You can use the try and catch for the bind property to resolve the issue at sample level. 

 

However, we have logged a defect report for this and will be included in our upcoming 2018 Volume 1 release. We will let you know once the release has been rolled out and will appreciate your patience until then. 

 

Please let us know if you require further assistance. 

 

Regards, 

Dinesh Babu Yadav