As the title suggests, I try to port a simple app to template 10 and throws me the following error:
Cannot determine the item type of collection type'Garage.Collections.GroupedObservableCollection`2[System.String, Garage.Models.Car]' because it has more than one Add method or ICollection implementation. To make this collection type usable in XAML, add a public Add(object) method, implement System.Collections.IList or a single System.Collections.Generic.ICollection
Since this works outside of template10 I am kind of stumped why this occurs. The Nuget Packages have the same versions, so only the template10 packages are different from the working version. Target platforms are the same.
The collection class I use is GroupedObservableCollection
It is used as a collectionviewsource in XAML.
Here is an overview of the classes and methods in VS2017
Thanks for having a look!
I fail to see what the problem is and why Template10 says no.