Cannot add a new item using KeyValuePair?

[Lars]

Hello,

I have a

public ObservableCollection<KeyValuePair<decimal, string>> myEntries { get; set;}

bound to my radGridView:

ItemsSource="{Binding Path=myEntries, Mode=TwoWay}"

and have the <CanUserInsertRows="True"> set.

However, I cannot add any entry: Not by clicking the left "+" for "Click here to add any item" nor by calling "BeginInsert();".
When I remove "ItemSource=", I at least can see that now there is space for an empty row.  So is something wrong with my binding? I can, by the way, delete items from the collection by pressing "del". But I cannot add any.

Is there a problem with the  'public ObservableCollection<KeyValuePair<decimal, string>> myEntries { get; set;}'?
Can somebody tell me why not even the empty row appears when clicking on "Click here to add any item"?

Thank you!

[Dimitrina]

Hi Lars,

You cannot add any entry: Not by clicking the left "+" for "Click here to add any item" nor by calling "BeginInsert();", because the RadGridView does not know how to create the new object of type KeyValuePair<decimal, string>. This is due to the fact that KeyValuePair<> does not have a default constructor.

In order to add new entries you may subscribe to the AddingNewDataItem of the GridView and initialize the NewObject there:

AddingNewDataItem="myEntriesGrid_AddingNewDataItem"

private void myEntriesGrid_AddingNewDataItem(object sender, Telerik.Windows.Controls.GridView.GridViewAddingNewEventArgs e)
{
     e.NewObject = new KeyValuePair<decimal, string>(50, "sample");
}

The Key and the Value properties of the KeyValuePair have only get property, so you cannot edit the values in the columns that are bound to them. 

If you have any further questions, please do not hesitate to contact us.

All the best,
Didie
the Telerik team

[Lars]

Yes, that helped. Thank you very much.

Lars.

[Walkingstar]

New to Using telerik controls.

I did not understand how to use KeyValuePair in this instance. Can you provide more information on how to Insert new records on-click of "Click here to add any item" button in the RadGrid.

Thanks.

[Dimitrina]

Hi Walkingstar,

 The Key and the Value properties of the KeyValuePair have only get property, therefore it does not allow you to add and edit Keys and Values in the columns that are bound to them.
You may insert new rows directly using a whole new KeyValuePair<> object like shown in my previous post.

Greetings,
Didie
the Telerik team

[Walkingstar]

Thanks Didi.