How to display property name in group header in wpf

Question

<!-- GroupHeaderStyle -->
<Style x:Key="GroupHeaderStyle" TargetType="{x:Type GroupItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type GroupItem}">
                <Expander IsExpanded="False" Margin="15,0,0,0">
                    <Expander.Header>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding ????????????}"/>
                            <TextBlock Text="-->"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                    </Expander.Header>
                    <ItemsPresenter />
                </Expander>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

In the above code, I want to display the name of the property by which it is grouped. For instance. Gender → Boy; Gender → Girl.

public class Test
{
    string gender;
    public string Gender
    {
        get { return gender; }
        set { gender = value; }
    } 
}

What should I provide ???????????? in the above xaml?

Also, please let me know if there is a good book or link that explains the grouping's internal details ListCollectionView.

Answer 1

DataContext CollectionViewGroup, Name, "" ( .. "" ). CollectionViewGroup , . , .

- , . CollectionViewGroup.Name , . , - :

public class GenderGroup {

    public GenderGroup(string gender) {
        this.Gender = gender;
    }

    public string Gender { get; private set; }
    public string Title {
        get {
            return "Gender";
        }
    }

    public override bool Equals(object obj) {
        var other = obj as GenderGroup;
        return (other != null && string.Equals(this.Gender, other.Gender));
    }
}

public class Test {
    string gender;
    GenderGroup genderGroup = new GenderGroup("none");

    public string Gender {
        get { return gender; }
        set {
            gender = value;
            genderGroup = new GenderGroup(gender);
        }
    } 

    public GenderGroup GenderGroup {
        get { return genderGroup; }
    }

}

:

<!-- GroupHeaderStyle -->
<Style x:Key="GroupHeaderStyle" TargetType="{x:Type GroupItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type GroupItem}">
                <Expander IsExpanded="False" Margin="15,0,0,0">
                    <Expander.Header>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Name.Title}"/>
                            <TextBlock Text="-->"/>
                            <TextBlock Text="{Binding Name.Gender}"/>
                        </StackPanel>
                    </Expander.Header>
                    <ItemsPresenter />
                </Expander>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

, GenderGroup . "Gender" , .