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//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
/**
* Namespace: System.Web.UI.Util
* 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.Util
{
internal class DataSourceHelper
{
public static IEnumerable GetResolvedDataSource(object source, string member)
{
if(source != null && source is IListSource)
{
IListSource src = (IListSource)source;
IList list = src.GetList();
if(!src.ContainsListCollection)
{
return list;
}
if(list != null && list is ITypedList)
{
ITypedList tlist = (ITypedList)list;
PropertyDescriptorCollection pdc = tlist.GetItemProperties(new PropertyDescriptor[0]);
if(pdc != null && pdc.Count > 0)
{
PropertyDescriptor pd = null;
if(member != null && member.Length > 0)
{
pd = pdc.Find(member, true);
} else
{
pd = pdc[0];
}
if(pd != null)
{
object rv = pd.GetValue(list[0]);
if(rv != null && rv is IEnumerable)
{
return (IEnumerable)rv;
}
}
throw new HttpException(
HttpRuntime.FormatResourceString("ListSource_Missing_DataMember", member));
}
throw new HttpException(
HttpRuntime.FormatResourceString("ListSource_Without_DataMembers"));
}
}
if(source is IEnumerable)
{
return (IEnumerable)source;
}
return null;
}
}
}
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