Hi Dominik,

We have had a lot of problems with the xamDataGrid when binding directly to an ObservableCollection.  Our solution is to expose its ListCollectionView instead and bind to that.

I would be interested to know if that solves your problem!

Dayne

Hi dembrats!

My Object Structure (simplified) looks as follows:

    public class PersonListViewModel
    {
        public ObservableCollection<Person> Persons { get; set; }

        public PersonListViewModel()
        {
            Persons = new ObservableCollection<Person>()
            {
                new Person(){Name = "Homer"},
                new Person(){Name = "Marge"},
                new Person(){Name = "Bart"},
                new Person(){Name = "Lista"},
                new Person(){Name = "Maggie"},
            };
        }
    }

    public class Person : INotifyPropertyChanged
    {
        public bool IsSelected { get; set; }

        public string Name { get; set; }
    }
   
If I use the following XAML I get the BindingExpression Error:
   
System.Windows.Data Error: 39 : BindingExpression path error: 'DataItem' property not found on 'object' ''PersonListViewModel' (HashCode=45523402)'. BindingExpression:Path=DataItem.IsSelected; DataItem='PersonListViewModel' (HashCode=45523402); target element is 'DataRecordPresenter' (Name=''); target property is 'IsSelected' (type 'Boolean')

XAML:  
<Window
    x:Class="WpfApplication4.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:l="clr-namespace:WpfApplication4"   
    xmlns:igDP="http://infragistics.com/DataPresenter">
    <Window.DataContext>
        <l:PersonListViewModel />
    </Window.DataContext>
    <Grid>
        <igDP:XamDataGrid Name="xamDataGrid1" DataSource="{Binding Persons}">
            <igDP:XamDataGrid.Resources>
                <Style TargetType="{x:Type igDP:DataRecordPresenter}">
                    <Setter Property="IsSelected" Value="{Binding DataItem.IsSelected, Mode=TwoWay}"/>
                </Style>
            </igDP:XamDataGrid.Resources>
            <igDP:XamDataGrid.FieldLayouts>
                <igDP:FieldLayout>
                    <igDP:FieldLayout.Fields>
                        <igDP:Field Name="Name" Label="Name"/>
                        <igDP:Field Name="IsSelected" Label="IsSelected" />
                    </igDP:FieldLayout.Fields>
                </igDP:FieldLayout>
            </igDP:XamDataGrid.FieldLayouts>
        </igDP:XamDataGrid>
    </Grid>
</Window>

Although the IsSelected Property is set correctly by now, I have experienced a negative performance impact when loading a large list of objects. Especially when scrolling via scrollbar, there are a lot of the following Binding Errors:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Infragistics.Windows.DataPresenter.DataRecordCellArea', AncestorLevel='1''. BindingExpression:Path=IsSelected; DataItem=null; target element is 'CellValuePresenter' (Name=''); target property is 'NoTarget' (type 'Object')

Is there a way to avoid these binding errors?

Best regards,
Dominik

Got it - I forgot fireing the propertychange event in the bound object. Sorry x)

Your XamDataGrid.DataSource is bound to the Persons property.  What type is that?

Hello,

I am not sure why this code snippet would not be working.

Do you have an IsSelected property of the underlying business object ?