How to use Indexer Property in New Release

[Nik]

Hi there,

I have download a new release for silverlight 2.0 (2009 1 0413).

How can I use the indexer property with Gridview.

I have one Class
Public Class Record

    Private _Columns As Object
    Public Property Column(ByVal name As String) As Object
        Get
            Return _Columns(name)
        End Get
        Set(ByVal value As Object)
            _Columns(name) = value
        End Set
    End Property

End Class

I am assigning list(of Record) to itemsource to Grid.

How can bind this to column.
like column should bind to Column("ID"), Column("Name")
Please suggest me.

Any help would really appreciated.

[Milan]

Hi Nik,

Our GridViewDataColumns have a property DataMemberBinding that you can usually use to address such scenarios. Unfortunately Silverlight bindings do not support indexers so you cannot do the following:

<telerikGrid:RadGridView Name="RadGridView1" AutoGenerateColumns="False">
    <telerikGrid:RadGridView.Columns>
        <telerikGrid:GridViewDataColumn
            DataMemberBinding="{Binding Path=Columns[ID]}"/>
    </telerikGrid:RadGridView.Columns>
</telerikGrid:RadGridView>

There is a workaround, though, that you could try. You could provide a ValueConverter to the DataMemberBinding that will access the indexer property and return a desired value.
Ultimately the XAML looks like that:

<telerikGrid:RadGridView Name="RadGridView1" AutoGenerateColumns="False">
    <telerikGrid:RadGridView.Columns>
        <telerikGrid:GridViewDataColumn
            DataMemberBinding="{Binding Converter={StaticResource IndexerConverter}, ConverterParameter=2}"/>
    </telerikGrid:RadGridView.Columns>
</telerikGrid:RadGridView>

The ConverterParameter specifies the index of the column that we want to bind to.   
I have prepared a sample application that demonstrates that approach.

Greetings,
Milan
the Telerik team

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[Nik]

Hi,

Thanks for the prompt reply.

I was looking for the TwoWay Binding. here in example you have created OneWay Binding.

Can you please help in doing TwoWay Binding.

[Milan]

Hello Nik,

Making TwoWay binding to work requires a lot of nasty code, still, I have modified the original application and now TwoWay binding is used. Given Silverlight's binding limitations I would recommend that you use a different approach - for example, change the way your data is structured so that you will not have to use indexers.

Best wishes,
Milan
the Telerik team

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