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23 * Namespace: System.Web.UI.Util
24 * Class: DataSourceHelper
26 * Author: Gaurav Vaish
27 * Maintainer: gvaish@iitk.ac.in
28 * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
31 * (C) Gaurav Vaish (2001)
35 using System
.Collections
;
36 using System
.ComponentModel
;
38 namespace System
.Web
.Util
40 internal class DataSourceHelper
42 public static IEnumerable
GetResolvedDataSource(object source
, string member
)
44 if(source
!= null && source
is IListSource
)
46 IListSource src
= (IListSource
)source
;
47 IList list
= src
.GetList();
48 if(!src
.ContainsListCollection
)
52 if(list
!= null && list
is ITypedList
)
54 ITypedList tlist
= (ITypedList
)list
;
55 PropertyDescriptorCollection pdc
= tlist
.GetItemProperties(new PropertyDescriptor
[0]);
56 if(pdc
!= null && pdc
.Count
> 0)
58 PropertyDescriptor pd
= null;
59 if(member
!= null && member
.Length
> 0)
61 pd
= pdc
.Find(member
, true);
68 object rv
= pd
.GetValue(list
[0]);
69 if(rv
!= null && rv
is IEnumerable
)
71 return (IEnumerable
)rv
;
74 throw new HttpException(
75 HttpRuntime
.FormatResourceString("ListSource_Missing_DataMember", member
));
77 throw new HttpException(
78 HttpRuntime
.FormatResourceString("ListSource_Without_DataMembers"));
81 if(source
is IEnumerable
)
83 return (IEnumerable
)source
;