83 lines
2.5 KiB
C#
83 lines
2.5 KiB
C#
//
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// System.Web.Util.DataSourceResolver
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//
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// Authors:
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// Ben Maurer (bmaurer@novell.com)
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//
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// (C) 2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//
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// This is from
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// _Developing Microsoft ASP.NET Server Controls and Components_ (Kothari, Datye)
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// Listing 20-3 "GetDataSource" (page 564)
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//
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using System.Collections;
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using System.ComponentModel;
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namespace System.Web.Util {
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class DataSourceResolver
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{
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DataSourceResolver () {}
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public static IEnumerable ResolveDataSource (object o, string data_member)
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{
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IEnumerable ds;
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ds = o as IEnumerable;
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if (ds != null)
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return ds;
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IListSource ls = o as IListSource;
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if (ls == null)
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return null;
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IList member_list = ls.GetList ();
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if (! ls.ContainsListCollection)
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return member_list;
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ITypedList tl = member_list as ITypedList;
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if (tl == null)
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return null;
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PropertyDescriptorCollection pd = tl.GetItemProperties (new PropertyDescriptor [0]);
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if (pd == null || pd.Count == 0)
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throw new HttpException ("The selected data source did not contain any data members to bind to");
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PropertyDescriptor member_desc = data_member == "" ?
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pd [0] :
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pd.Find (data_member, true);
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if (member_desc != null)
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ds = member_desc.GetValue (member_list [0]) as IEnumerable;
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if (ds == null)
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throw new HttpException ("A list corresponding to the selected DataMember was not found");
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return ds;
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}
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}
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}
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