Windows phone 7 windows phone 8长列表选择器选择更多添加更多
我正在关注phonetoolkit longlistselector和中的示例。我正在尝试将showmore功能添加到我的应用程序页面。通常像在longlistselector中一样,我会按字母顺序显示作者,并为每个组显示更多按钮 问题: 这里的问题是,我无法通过按show more按钮添加新作者,而且我也无法在我的longlistselector中更新此内容。我发现在Alphakeygroup类中添加作者(在我上面提到的链接中找到)有问题。我该怎么做 这是我的字母组课Windows phone 7 windows phone 8长列表选择器选择更多添加更多,windows-phone-7,windows-phone-8,windows-phone,windows-phone-7.1,Windows Phone 7,Windows Phone 8,Windows Phone,Windows Phone 7.1,我正在关注phonetoolkit longlistselector和中的示例。我正在尝试将showmore功能添加到我的应用程序页面。通常像在longlistselector中一样,我会按字母顺序显示作者,并为每个组显示更多按钮 问题: 这里的问题是,我无法通过按show more按钮添加新作者,而且我也无法在我的longlistselector中更新此内容。我发现在Alphakeygroup类中添加作者(在我上面提到的链接中找到)有问题。我该怎么做 这是我的字母组课 public cla
public class AlphaKeyGroup<T> : List<T>
{
/// <summary>
/// The delegate that is used to get the key information.
/// </summary>
/// <param name="item">An object of type T</param>
/// <returns>The key value to use for this object</returns>
public delegate string GetKeyDelegate(T item);
/// <summary>
/// The Key of this group.
/// </summary>
public string Key { get; private set; }
/// <summary>
/// Public constructor.
/// </summary>
/// <param name="key">The key for this group.</param>
public AlphaKeyGroup(string key)
{
Key = key;
}
/// <summary>
/// Create a list of AlphaGroup<T> with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="slg">The </param>
/// <returns>Theitems source for a LongListSelector</returns>
private static List<AlphaKeyGroup<T>> CreateGroups(SortedLocaleGrouping slg)
{
List<AlphaKeyGroup<T>> list = new List<AlphaKeyGroup<T>>();
foreach (string key in slg.GroupDisplayNames)
{
list.Add(new AlphaKeyGroup<T>(key));
}
return list;
}
/// <summary>
/// Create a list of AlphaGroup<T> with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="items">The items to place in the groups.</param>
/// <param name="ci">The CultureInfo to group and sort by.</param>
/// <param name="getKey">A delegate to get the key from an item.</param>
/// <param name="sort">Will sort the data if true.</param>
/// <returns>An items source for a LongListSelector</returns>
public static List<AlphaKeyGroup<T>> CreateGroups(IEnumerable<T> items, CultureInfo ci, GetKeyDelegate getKey, bool sort)
{
SortedLocaleGrouping slg = new SortedLocaleGrouping(ci);
List<AlphaKeyGroup<T>> list = CreateGroups(slg);
foreach (T item in items)
{
int index = 0;
if (slg.SupportsPhonetics)
{
//check if your database has yomi string for item
//if it does not, then do you want to generate Yomi or ask the user for this item.
//index = slg.GetGroupIndex(getKey(Yomiof(item)));
}
else
{
index = slg.GetGroupIndex(getKey(item));
}
if (index >= 0 && index < list.Count)
{
list[index].Add(item);
}
}
if (sort)
{
foreach (AlphaKeyGroup<T> group in list)
{
group.Sort((c0, c1) => { return ci.CompareInfo.Compare(getKey(c0), getKey(c1)); });
}
}
return list;
}
}
我的xaml.cs文件
public CategoryFilter()
{
InitializeComponent();
authorsviewmodel = new AuthorsViewModel();
LoadAuthors();
}
private void LoadAuthors()
{
List<Author> movies = new List<Author>();
authorsviewmodel.GetAllAuthors();
var Authorsgroup = AlphaKeyGroup<Author>.CreateGroups(authorsviewmodel.AuthorsList, System.Threading.Thread.CurrentThread.CurrentUICulture, (Author s) => { return s.AuthorName; }, true);
AuthorsList.ItemsSource = Authorsgroup;
}
public CategoryFilter()
{
初始化组件();
authorsviewmodel=新的authorsviewmodel();
LoadAuthors();
}
私有void LoadAuthors()
{
列表电影=新列表();
authorsviewmodel.GetAllAuthors();
var Authorsgroup=AlphaKeyGroup.CreateGroups(authorsviewmodel.AuthorsList,System.Threading.Thread.CurrentThread.CurrentUICulture,(Author s)=>{return s.AuthorName;},true);
AuthorsList.ItemsSource=作者组;
}
Morecommands类
public class MoreCommand : ICommand
{
#region ICommand Members
public bool CanExecute(object parameter)
{
return true;
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
AlphaKeyGroup<Author> list = parameter as AlphaKeyGroup<Author>;
Author item = new Author();
item.AuthorName = "BAIG123";
list.Add(item);
AuthorsViewModel authorviewmodel=new AuthorsViewModel();
authorviewmodel.Authors = parameter as List<AlphaKeyGroup<Author>>;
authorviewmodel.Authors.Add(list);
}
#endregion
}
public类命令:ICommand
{
#区域ICommand成员
公共布尔CanExecute(对象参数)
{
返回true;
}
公共事件处理程序CanExecuteChanged;
public void Execute(对象参数)
{
AlphaKeyGroup list=参数为AlphaKeyGroup;
作者项=新作者();
item.AuthorName=“BAIG123”;
列表。添加(项目);
AuthorsViewModel authorviewmodel=新的AuthorsViewModel();
authorviewmodel.Authors=作为列表的参数;
authorviewmodel.Authors.Add(列表);
}
#端区
}
问题在于,当您修改列表时,您的视图将不会收到更改通知。
您只需将class AlphaKeyGroup:List
更改为class AlphaKeyGroup:ObservableCollection
,即可解决此问题
public class MoreCommand : ICommand
{
#region ICommand Members
public bool CanExecute(object parameter)
{
return true;
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
AlphaKeyGroup<Author> list = parameter as AlphaKeyGroup<Author>;
Author item = new Author();
item.AuthorName = "BAIG123";
list.Add(item);
AuthorsViewModel authorviewmodel=new AuthorsViewModel();
authorviewmodel.Authors = parameter as List<AlphaKeyGroup<Author>>;
authorviewmodel.Authors.Add(list);
}
#endregion
}