105 lines
3.7 KiB
C#
105 lines
3.7 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DataSourceHelper.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.ComponentModel.Design;
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using System.Data;
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using System.Diagnostics;
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namespace System.Web.UI.MobileControls
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{
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/*
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* Data Source Helper class. Copied fairly verbatim from ASP.NET code base, and modified
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* to match our coding standards and, more importantly, use our exceptions.
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* The ASP.NET file is /system/web/ui/DataSourceHelper.cs (a private class)
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*
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* Copyright (c) 2000 Microsoft Corporation
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*/
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[Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
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internal sealed class DataSourceHelper
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{
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private DataSourceHelper()
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{
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}
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internal static IEnumerable GetResolvedDataSource(Object dataSource, String dataMember)
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{
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if (dataSource == null)
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{
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return null;
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}
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IListSource listSource = dataSource as IListSource;
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if (listSource != null)
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{
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IList memberList = listSource.GetList();
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if (listSource.ContainsListCollection == false)
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{
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// The returned list is itself the list we need to bind to.
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// (Ignore DataMember parameter.)
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return (IEnumerable)memberList;
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}
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if ((memberList != null) && (memberList is ITypedList))
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{
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ITypedList typedMemberList = (ITypedList)memberList;
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PropertyDescriptorCollection propDescs =
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typedMemberList.GetItemProperties (new PropertyDescriptor[0]);
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if ((propDescs != null) && (propDescs.Count != 0))
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{
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PropertyDescriptor listProperty = null;
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if ((dataMember == null) || (dataMember.Length == 0))
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{
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listProperty = propDescs[0];
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}
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else
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{
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listProperty = propDescs.Find(dataMember, true);
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}
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if (listProperty != null)
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{
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Object listRow = memberList[0];
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Object list = listProperty.GetValue(listRow);
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if ((list != null) && (list is IEnumerable))
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{
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return (IEnumerable)list;
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}
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}
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throw new ArgumentException(
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SR.GetString(SR.DataSourceHelper_MissingDataMember,
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dataMember));
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}
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else
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{
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throw new ArgumentException(
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SR.GetString(SR.DataSourceHelper_DataSourceWithoutDataMember,
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"List DataSource"));
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}
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}
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}
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if (dataSource is IEnumerable)
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{
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return (IEnumerable)dataSource;
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}
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return null;
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}
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}
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}
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