Я знаю, что здесь есть похожие темы, но я не могне могу получить от них ответа. Я должен обновить фон сетки либо на изображение, либо на цвет в моем приложении для Windows Phone 7. Я делаю это, используя мой конвертер значений, он работает нормально, но яЯ должен перезагрузить коллекцию, чтобы она обновляла цвет или изображение.

Конвертер получает объект, затем получает цвет и изображение от него, вот конвертер

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {

            People myC = value as People;

            string myImage = myC.Image;
            object result = myC.TileColor;

            if (myImage != null)
            {

                BitmapImage bi = new BitmapImage();
                bi.CreateOptions = BitmapCreateOptions.BackgroundCreation;
                ImageBrush imageBrush = new ImageBrush();

                using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
                {
                    if (myIsolatedStorage.FileExists(myImage))
                    {

                        using (
                            IsolatedStorageFileStream fileStream = myIsolatedStorage.OpenFile(myImage, FileMode.Open,
                                                                                              FileAccess.Read))
                        {
                            bi.SetSource(fileStream);
                            imageBrush.ImageSource = bi;
                        }
                    }
                    else
                    {
                        return result;
                    }
                }

                return imageBrush;
            }
            else
            {
                return result;
            }

    }

Мне нужно как-то обновить / обновить тег сетки или конвертер значений, чтобы он мог показывать последние изменения!

РЕДАКТИРОВАТЬ

ДОБАВЛЕНО НЕКОТОРЫЙ БОЛЬШЕ КОДА

Модель :

  [Table]
    public class People : INotifyPropertyChanged, INotifyPropertyChanging
    {


        private int _peopleId;

        [Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)]
        public int PeopleId
        {
            get { return _peopleId; }
            set
            {
                if (_peopleId != value)
                {
                    NotifyPropertyChanging("PeopleId");
                    _peopleId = value;
                    NotifyPropertyChanged("PeopleId");
                }
            }
        }

        private string _peopleName;

        [Column]
        public string PeopleName
        {
            get { return _peopleName; }
            set
            {
                if (_peopleName != value)
                {
                    NotifyPropertyChanging("PeopleName");
                    _peopleName = value;
                    NotifyPropertyChanged("PeopleName");
                }
            }
        }




        private string _tileColor;

        [Column]
        public string TileColor
        {
            get { return _tileColor; }
            set
            {
                if (_tileColor != value)
                {
                    NotifyPropertyChanging("TileColor");
                    _tileColor = value;
                    NotifyPropertyChanged("TileColor");
                }
            }
        }



        private string _image;

        [Column]
        public string Image
        {
            get { return _image; }
            set
            {
                if (_image != value)
                {
                    NotifyPropertyChanging("Image");
                    _image = value;
                    NotifyPropertyChanged("Image");
                }
            }
        }


        [Column]
        internal int _groupId;

        private EntityRef _group;

        [Association(Storage = "_group", ThisKey = "_groupId", OtherKey = "Id", IsForeignKey = true)]
        public Groups Group
        {
            get { return _group.Entity; }
            set
            {
                NotifyPropertyChanging("Group");
                _group.Entity = value;

                if (value != null)
                {
                    _groupId = value.Id;
                }

                NotifyPropertyChanging("Group");
            }
        }


        [Column(IsVersion = true)]
        private Binary _version;

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        #endregion

        #region INotifyPropertyChanging Members

        public event PropertyChangingEventHandler PropertyChanging;

        private void NotifyPropertyChanging(string propertyName)
        {
            if (PropertyChanging != null)
            {
                PropertyChanging(this, new PropertyChangingEventArgs(propertyName));
            }
        }

        #endregion
    }

ViewModel:

public class PeopleViewModel : INotifyPropertyChanged
{

    private PeopleDataContext PeopleDB;

    // Class constructor, create the data context object.
    public PeopleViewModel(string PeopleDBConnectionString)
    {
        PeopleDB = new PeopleDataContext(PeopleDBConnectionString);
    }


    private ObservableCollection _allPeople;

    public ObservableCollection AllPeople
    {
        get { return _allPeople; }
        set
        {
            _allPeople = value;
            NotifyPropertyChanged("AllPeople");
        }
    }

    public ObservableCollection LoadPeople(int gid)
    {
        var PeopleInDB = from People in PeopleDB.People
                           where People._groupId == gid
                           select People;


        AllPeople = new ObservableCollection(PeopleInDB);

        return AllPeople;
    }


    public void updatePeople(int cid, string cname, string image, string tilecol)
    {
        People getc = PeopleDB.People.Single(c => c.PeopleId == cid);
        getc.PeopleName = cname;
        getc.Image = image;
        getc.TileColor = tilecol;

        PeopleDB.SubmitChanges();

    }

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(string propertyName)
    {
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
                }
    }

    #endregion
}

Страница приложения

Код страницы приложения позади

public partial class PeopleList : PhoneApplicationPage
{

    private int gid;
    private bool firstRun;

    public PeopleList()
    {
        InitializeComponent();
        firstRun = true;
        this.DataContext = App.ViewModel;
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {

        gid = int.Parse(NavigationContext.QueryString["Id"]);

        if (firstRun)
        {
            App.ViewModel.LoadPeople(gid);
            firstRun = false;
        }


    }

 }