master detail binding in WPF - wpf

Question

Why don't I see the details in this example. I cannot change the structure of dataclass, master class and detail class. So I have to solve this with the correct binding.
public class ViewModel
{
public dataclass data { get; set; }
public ViewModel()
{
data = new dataclass();
master a_master = new master();
a_master.mastername = "hello";
detail a_detail = new detail();
a_detail.detailname = "goodbye";
data.details.Add(a_detail);
data.Add(a_master);
}
}
public class dataclass : ObservableCollection<master>
{
public ObservableCollection<detail> details { get; set; }
public dataclass()
{
details = new ObservableCollection<detail>();
}
}
public class master
{
public string mastername { get; set; }
}
public class detail
{
public string detailname { get; set; }
}
And in my XAML I am binding like this:
<Window x:Class="md.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:md.viewmodels"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<vm:ViewModel/>
</Window.DataContext>
<StackPanel Orientation="Vertical" >
<ListView ItemsSource="{Binding Path=data}">
<ListView.View>
<GridView>
<GridViewColumn Header="master" DisplayMemberBinding="{Binding mastername}"/>
</GridView>
</ListView.View>
</ListView>
<ListView ItemsSource="{Binding Path=data/details}">
<ListView.View>
<GridView>
<GridViewColumn Header="detail" DisplayMemberBinding="{Binding detailname}"/>
</GridView>
</ListView.View>
</ListView>
</StackPanel>
</Window>

Answer 1

Try
<ItemsSource="{Binding Path=data.details}">
instead of
<ItemsSource="{Binding Path=data/details}">
I think what you tried to achieve was kind of a master/detail scenario with binding to hierarchical data like decribed in How to: Use the Master-Detail Pattern with Hierarchical Data. In fact, as long as you have an ObservableCollection<details> as property of a class derived from ObservableCollection<master> this is not hierarchical, and hence the / in the binding expression won't work. See PropertyPath XAML Syntax, section Source Traversal (Binding to Hierarchies of Collections) for details about the /.
Also there are widely accepted conventions for capitalization in C#, saying that you should use Pascal casing for public types like the classes and properties here.