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.
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:
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