How to apply StyleSelector to DataFormatString

[david mcintyre]

Whenever I attempt to apply a style selector to dynamically set the DataFormatString, I get a xamlparseexception.  I would like to dynamically set the # of decimal places in the cells' data. 
My style selector is declared in the usercontrol's resources as:

<local:CellDataFormatStyleSelector x:Key="myDataformatStyleSelector"/>

and is applied in my data column as:

<telerikGridView:GridViewDataColumn Header="1" DataMemberBinding="{Binding PeriodQty1}"   TextAlignment="Right" HeaderTextAlignment="Center" CellStyleSelector="{StaticResource myDataformatStyleSelector}"     />

Here is the code for my style selector:

public class CellDataFormatStyleSelector : StyleSelector
    {
        public override Style SelectStyle(object item, DependencyObject container)
        {
            var style = new Style(typeof(GridViewDataColumn));
            //var row = (GridViewRow)container;
            var obj = (ItemLocationperiodDemand)item;
            var col = (GridViewCell)container;
            if (obj.YearLabel == ApplicationStrings.Composite)
            {
                style.Setters.Add(new Setter(GridViewDataColumn.DataFormatStringProperty, "{}{0:n1}"));
            }
            else
            {
                style.Setters.Add(new Setter(GridViewDataColumn.DataFormatStringProperty, "{}{0:n0}"));
            }
            return style;          }
    }

In my styleselector code, the type of the container is GridViewCell.  But I can't set a DataFormatString property within a style for a cell, only within the datacolumn.  So is it possible to do this with a style selector? 

[Vlad]

Hello,

 Why not use CellTemplateSelector instead? You can load completely different templates depending on your condition. Please check this demo for more info. 

Best wishes,
Vlad
the Telerik team

[david mcintyre]

I didn't use the CellTemplateSelectors because the DataTemplate property includes the name of the property that's being bound to.  And I need to apply the logic as to how the column's cells are styled in 13 of the grid's columns.  So if i use the template selector, then I have to create 13 sets of selectors and templates  (unless there's a way to bind to the paren'ts datamemberbinding in the datatemplate).

[Vlad]

Hello ,

 You can construct the template dynamically similar to my blog post. Simple string.Format may do the work with dynamic binding in your case. 

All the best,
Vlad
the Telerik team

[david mcintyre]

Your blog post doesn't seem to be a convenient solution to my problem.  I have 13 different columns in my datagrid, and each needs to have dataformatstring dynamically applied.  And each column is bound to a different property.  But in the template example in your blog post, the binding source property is specified in the template
<TextBlock Text=""{Binding ID}""

So how can i create a template that can be bound to any property?

[Vlad]

Hello,

 As I said in my previous reply you need to construct the string (XAML) dynamically. For example:
string xaml = String.Format(@"<TextBlock Text=""{{Binding {0}}}""", "YourProperty");

Sincerely yours,
Vlad
the Telerik team