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/**
* Namespace: System.Web.UI.Utils
* Class: DataSourceHelper
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Status: 10%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Collections;
using System.ComponentModel;
namespace System.Web.Utils
{
internal class DataSourceHelper
{
public static IEnumerable GetResolvedDataSource(object source, string member)
{
if(source==null)
return null;
if(source is IListSource)
{
IListSource ils = (IListSource)source;
IList il = ils.GetList();
if(ils.ContainsListCollection)
{
return il;
}
if(il is ITypedList)
{
ITypedList itl = (ITypedList)il;
PropertyDescriptorCollection pdc = itl.GetItemProperties(new PropertyDescriptor[0]);
PropertyDescriptor pd = null;
if(pdc != null)
{
if(pdc.Count > 0)
{
if(member != null)
{
if(member.Length > 0)
{
pd = pdc.Find(member, true);
} else
{
pd = pdc[0];
}
}
}
}
if(pd!=null)
{
object o = pd.GetValue(il[0]);
if(o!=null)
{
if(o is IEnumerable)
return (IEnumerable)o;
}
throw new HttpException("ListSource Empty"); // no data in ListSource object
}
}
} else if(source is IEnumerable)
{
return (IEnumerable)source;
}
return null;
}
}
}
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