ListView group headers binding issue

Sunday, May 4, 2014

I have a basic program in which I'm trying to test a possible layout of ListView, so that I can use it in my main project. I'm having a problem displaying the headers for the groups and I can't figure it out. It's obviously a binding issue, but after much searching and reading through many ListView grouping/header related postings, I haven't been able to solve it. I prefer to get it all done within XAML, since my ViewModels will have no knowledge of the Views. I can display regular text, but not the binding when dealing with the group headers. Here's my code:


View:



<Window.Resources>
<CollectionViewSource Source="{Binding Collection}" x:Key="GroupedItems">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="RepNum" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Window.Resources>

<ListView HorizontalAlignment="Left" Height="300" Margin="10,10,0,0"
VerticalAlignment="Top" Width="497"
ItemsSource="{Binding Source={StaticResource GroupedItems}}">
<ListView.View>
<GridView>
<GridViewColumn Header="File Name"
DisplayMemberBinding="{Binding FileName}"/>
<GridViewColumn Header="Date Scanned"
DisplayMemberBinding="{Binding DateScanned}"/>
<GridViewColumn Header="Time Scanned"
DisplayMemberBinding="{Binding TimeScanned}"/>
</GridView>
</ListView.View>

<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding RepNum}" Margin="0,0,10,0"/>
<TextBlock Text="Text1" Margin="0,0,10,0"/>
<TextBlock Text="Text2"/>
</StackPanel>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>


ViewModel (very dirty, quick-style for testing purposes):



public class MainWindowViewModel
{
public ObservableCollection<Record> Collection { get; set; }

public MainWindowViewModel()
{
Collection = new ObservableCollection<Record>();

Collection.Add(
new Record()
{
RepNum = "12345",
FileName = "12345.pdf",
DateScanned = "05/01/2014",
TimeScanned = "1802"
});

Collection.Add(
new Record()
{
RepNum = "12345",
FileName = "12345C1.pdf",
DateScanned = "05/03/2014",
TimeScanned = "1401"
});

Collection.Add(
new Record()
{
RepNum = "12345",
FileName = "12345S1.pdf",
DateScanned = "05/03/2014",
TimeScanned = "1408"
});

Collection.Add(
new Record()
{
RepNum = "643334",
FileName = "643334.pdf",
DateScanned = "02/01/2013",
TimeScanned = "1305"
});

Collection.Add(
new Record()
{
RepNum = "643334",
FileName = "643334S1.pdf",
DateScanned = "02/06/2013",
TimeScanned = "0805"
});
}
}


You can guess what Record class looks like by looking at how I create instances of it, so there's nothing special there. I don't have a problem viewing RepNum on any binding, except the ListView group header. I'm obviously either missing a step or don't have a proper binding syntax for its case. However, I can't figure it out.


Here's what it looks like:


enter image description here


As you can see, plain text "Text1" and "Text2" are displayed, but not the RepNum property.







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