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Problems with binding GridViewComboBoxColumn to a dynamic property

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Angerico asked on 03 Apr 2012, 01:20 PM

I've been using dynamic objects bound to a RadGridView control. Yeah our business model here is quite weird. Anyway, they've been working fine and dandy... until I tried implementing a combobox column! *insert ominous sound here*

Here's how to reproduce the problem:

Define a LookupItem class as:

public class LookupItem

{

public object Key { get; set; }

public object Value { get; set; }

}

Create instances of this class and put them into a list called lookups that you will use later as an ItemsSource for a GridViewComboBoxColumn.

var lookups = new ObservableCollection<LookupItem>();

lookups.Add(new LookupItem() { Key = "1", Value = "test1 - value" });

lookups.Add(new LookupItem() { Key = "2", Value = "test2 - value" });

Afterwards, create a collection of dynamic objects using the ExpandoObject class which you will then put into a grid called "gridView".

var list = new ObservableCollection<ExpandoObject>();

dynamic row = new ExpandoObject();

row.Prop1 = "1";

row.Prop2 = "foo";

list.Add(row);

row = new ExpandoObject();

row.Prop1 = "2";

row.Prop2 = "bar";

list.Add(row);

gridView.ItemsSource = list;

Finally, we manually specify the columns for the grid. Don't forget to assign the lookups we created to the combobox column's ItemsSource.

gridView.Columns.Clear();

var column1 = new GridViewComboBoxColumn();

column1.DisplayMemberPath = "Value";

column1.SelectedValueMemberPath = "Key";

column1.DataMemberBinding = new Binding("Prop1");

column1.UniqueName = "Prop1";

column1.ItemsSource = lookups;

gridView.Columns.Add(column1);

var column2 = new GridViewDataColumn();

column2.DataMemberBinding = new Binding("Prop2");

column2.UniqueName = "Prop2";

gridView.Columns.Add(column2);

If you try that, you will get a grid with two columns, one with a combobox that is not correctly bound, and one with normal text that is correctly bound to "Prop2".

And if you do not use dynamic classes, i.e. you specifically create "Prop1" and "Prop2" properties, you will see that the combobox column will be bound correctly to "Prop1".

Is this a limitation on the current control, or is there a possible workaround? Looking forward to the fun times ahead...

7 Answers, 1 is accepted

Accepted

answered on 04 Apr 2012, 12:08 PM

Hi Vlad,

Sorry you must've misunderstood me. The combo box is still related to the grid via the combo box's Selected Value and a property in the current row. Using my simple example above, I have a list of LookupItems, each having properties Key and Value. I have a grid of objects with properties called Prop1 and Prop2. I need to equate the Key property of the LookupItems to the Prop1 property of the grid objects.

I originally used a GridViewComboBoxColumn but it does not play nicely if Prop1 happened to be a dynamic property. If it was a static property, it works fine.

So now I want to try out the suggestion of using a simple column but with a combo box for its CellEditTemplate.