WPF items not visible when grouping is applied

Question

I'm having this strange issue with my ItemsControl grouping. I have the following setup:

In my ViewModel, I expose a CollectionViewSource named 'Communications'. I proceed to adding a grouping patter like so:

Communications.GroupDescriptions.Add(new PropertyGroupDescription("Subject"));

Now, the problem i'm experience is the grouping work fine, but I can't see any items inside the groups. What am I doing wrong? Any pointers would be much appreciated.

Paul Stovell · Accepted Answer

I can't seem to reproduce the problem - I assume you are using a CollectionViewSource? It might be because you bound to the View property directly.

Here's the C# code I used:

public class Communication
{
    public string Subject { get; set; }
    public string Body { get; set; }
}

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        var source = (CollectionViewSource)Resources["Communications"];
        source.Source = new List()
        {
            new Communication { Subject = "WPF 4.0", Body = "I love what's happening with 4.0"},
            new Communication { Subject = "WPF 4.0", Body = "I hear the text rendering is the best feature"},
            new Communication { Subject = "Blend 3.0", Body = "Behaviors in Blend 3 change everything"}
        };

        source.GroupDescriptions.Add(new PropertyGroupDescription("Subject"));
    }
}

Here is the XAML - it's the same as yours but with a couple of things removed since I don't have your converters or commands:

WPF items not visible when grouping is applied

Answers (2)

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