/// <summary>
/// Gets the list of data from the associated <see cref="IListDataSource"/> control and
/// applies the specified filter and sort expression.
/// </summary>
/// <param name="arguments">A System.Web.UI.DataSourceSelectArguments that
/// is used to request operations on the data beyond basic data retrieval.</param>
/// <returns>An System.Collections.IEnumerable list of data from the associated EntityDataSource.</returns>
protected override IEnumerable ExecuteSelect(DataSourceSelectArguments arguments)
{
IListDataSource dataSource = _owner.GetListDataSource();
IEnumerable entityList = null;
if (dataSource != null)
{
entityList = dataSource.GetEntityList();
}
else
{
_owner.DataBind();
if (_owner.DataSource is IEnumerable)
{
entityList = _owner.DataSource as IEnumerable;
}
}
if (entityList != null)
{
// apply filter
OnApplyFilter(entityList);
if (!String.IsNullOrEmpty(Filter))
{
EntityUtil.SetPropertyValue(entityList, "Filter", Filter);
}
// apply sort
OnApplySort(entityList);
if (!String.IsNullOrEmpty(Sort))
{
EntityUtil.InvokeMethod(entityList, "Sort", new Object[] { Sort });
}
}
return(entityList);
}
/// <summary>
/// Updates and returns the value of the DataParameter object.
/// </summary>
/// <param name="context">The current System.Web.HttpContext of the request.</param>
/// <param name="control">The System.Web.UI.Control that the parameter is bound to.</param>
/// <returns>A System.Object that represents the updated and current value of the parameter.</returns>
protected override Object Evaluate(HttpContext context, Control control)
{
String value = String.Empty;
if (_dataSource == null && control != null)
{
_dataSource = control.FindControl(DataSourceID) as IListDataSource;
}
if (_dataSource != null)
{
IEnumerable entityList = _dataSource.GetEntityList();
if (entityList != null)
{
CommaDelimitedStringCollection values = new CommaDelimitedStringCollection();
String propertyName = PropertyName ?? EntityKeyName;
IList list = EntityUtil.GetEntityList(entityList);
Object temp;
foreach (Object item in list)
{
temp = EntityUtil.GetPropertyValue(item, EntityKeyName);
if (temp != null)
{
values.Add(String.Format("'{0}'", temp));
}
}
if (values.Count > 0)
{
value = String.Format("{0} IN ({1})", propertyName, values.ToString());
}
}
}
return(value);
}
