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Group Listbox for Windows Phone 7?

I'm looking for a way to grou开发者_如何学JAVAp items similar to the way the applications below have it for there grouping. Is it possible to create a group listbox using View Models? I plan on having multiple customer groups for example:

"AAA" (Group) -- "XDN" (Contact)

"NCB" (Group) -- "XDN" (Contact)

etc... I don't want it to be seperated by letters but instead by group names. Is this possible?

Thanks.

Group Listbox for Windows Phone 7?

Group Listbox for Windows Phone 7?


Nothing prevents you from creating a custom ordered collection that suits that precise purpose. Here's the collection type I usually use for it, when integrating it with the LongListSelector in the Silverlight Toolkit

You'll obviously have to modify the GroupHeaderTemplate but that's very easy.

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace LongListSample
{
    public class LongListCollection<T, TKey> : ObservableCollection<LongListItem<T, TKey>>
        where T : IComparable<T>
    {
        public LongListCollection()
        {
        }

        public LongListCollection(IEnumerable<T> items, Func<T, TKey> keySelector)            
        {
            if (items == null)
                throw new ArgumentException("items");

            var groups = new Dictionary<TKey, LongListItem<T, TKey>>();

            foreach (var item in items.OrderBy(x => x))
            {
                var key = keySelector(item);

                if (groups.ContainsKey(key) == false)
                    groups.Add(key, new LongListItem<T, TKey>(key));

                groups[key].Add(item);
            }

            foreach (var value in groups.Values)
                this.Add(value);
        }
    }

    public class LongListItem<T, TKey> : ObservableCollection<T>
    {
        public LongListItem()
        {
        }

        public LongListItem(TKey key)
        {
            this.Key = key;
        }

        public TKey Key
        {
            get;
            set;
        }

        public bool HasItems
        {
            get
            {
                return Count > 0;
            }
        }
    }
}

Example of use:

Group Listbox for Windows Phone 7?

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