DataTable and INotifyPropertyChanged

[Jingmeng]

hey all,
i'm working on a grid, to be simple, which has 3 columns, price, quantity, and total, total is price*quantity, i know, it working great if i have gridview.itemsource is binding with a class which with INotifyPropertyChanged.  but so far, i need binding with a datatable ( Enumerable(Dictionary<string, object>) ), so i have such problem, when i change quantity or price, i can update that datatable (change price or quantity and change total also) by using celledited event, but the value in total cell didnt update, and either because im in celledited event, i cant do grid.itemsource = null; grid.itemsource = datatable; 

so basically, is possible put  INotifyPropertyChanged in datatable? or there is any other solution..

cheers

[Milan]

Hi Jingmeng,

You could use a DataView instead which supports InotifyCollectionChanged and InotifyhPropertyChange events. Simply use myDataTable.DefaultView as ItemsSource.

Regards,
Milan
the Telerik team

[Jingmeng]

hey milan,
can i use system.data.datatable in silverlight? cause the one im use is light-weight datatable
like 

public class DataTable : IEnumerable

{

    List<DataColumn> columns = null;

    public List<DataColumn> Columns

    {

        get

        {

            if (columns == null)

            {

                columns = new List<DataColumn>();

            } 

            return columns;

        }

    }

 

    List<DataRow> rows = null;

    public List<DataRow> Rows

    {

        get

        {
            if (rows == null)

            {

                rows = new List<DataRow>();

            }             

            return rows;

        }

    }

 

    public object NewRow()

    {

        if (queryable != null)

        {

            return Activator.CreateInstance(queryable.ElementType);

        }

 

        return null;

    }

 

    #region IEnumerable Members

    IQueryable queryable = null;

    public IEnumerator GetEnumerator()

    {

        if (queryable == null)

        {

            var type = ClassFactory.Instance.GetDynamicClass(this.Columns.Select(c => new System.Linq.Dynamic.DynamicProperty(c.ColumnName, c.DataType)));

            var propertyInfos = type.GetProperties().ToList();

 

            var list = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(type));

            foreach (var row in this.Rows)

            {

                var item = Activator.CreateInstance(type);

                propertyInfos.ForEach(p => p.SetValue(item, row[p.Name], null));

 

                list.Add(item);

            }

 

            queryable = list.AsQueryable();

        }

 

        return queryable.GetEnumerator();

    }

 

    #endregion

 

    public IList ToList()

    {

        var enumerator = GetEnumerator();

        var list = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(queryable.ElementType));

        while (enumerator.MoveNext())

        {

            list.Add(enumerator.Current);

        }

        return list;

    }

 

    static Type GetNonNullableType(Type type)

    {

        return IsNullableType(type) ? type.GetGenericArguments()[0] : type;

    }

 

    static bool IsNullableType(Type type)

    {

        return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);

    }

}

 

public class DataColumn

{

    public DataColumn()

    {

        DataType = typeof(object);

    }

 

    public Type DataType { get; set; }

    public string ColumnName { get; set; }

}

 

public class DataRow : Dictionary<string, object>

{

 

}

cheers

MENG