InsertRow MVVM cell binding while editing

[Sandra]

I have a GridView bound using MVVM to a collection of `List<Person> People`.

 

Let's say the 'Person' class has properties like:

public List<ID> IDs { get; set; }

public string Name { get; set; }

public DateTime BirthDate { get; set; }

My issue is that I'd like to allow a user to click to insert a new row in the data grid, but I need it so that as they are typing in a 'Name', the DB is doing a query finding all IDs for that person which will populate a ComboBoxColumn for the IDs property above.  So it seems like I need to be able to bind (with MVVM) onto a 'Cell Editing' event for a cell so I can get an event as each character is typed.  I also need to know what item (SelectedItem is null for a new row for some reason in MVVM) is being edited so I can insert the returned array of found IDs into that item.  Any help would be appreciated and I'd like to avoid using Code-Behind.

[Dilyan Traykov]

Hello Sandra,

I've prepared a small sample project based on the Cascading Combobox Columns demo from our SDK Samples Browser to show a possible implementation of the desired functionality.

 

You can see that I've used an ItemsSourceBinding for the GridViewComboBoxColumn which means that each item will have a different list of countries to choose from. In your case, you should bind this property to each person's IDs collection, and define its getter in such a way that it displays only IDs associated with the current Name of the Person.

I hope this makes sense and helps you in implementing this requirement at your end. If you require any further assistance in the process, please let me know.

Regards,
Dilyan Traykov
Progress Telerik