77 lines
3.0 KiB
C#
77 lines
3.0 KiB
C#
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//------------------------------------------------------------------------------
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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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namespace System.Web.UI {
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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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internal sealed class DataSourceHelper {
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private DataSourceHelper() {
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}
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internal static IEnumerable GetResolvedDataSource(object dataSource, string dataMember) {
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if (dataSource == null)
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return null;
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IListSource listSource = dataSource as IListSource;
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if (listSource != null) {
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IList memberList = listSource.GetList();
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if (listSource.ContainsListCollection == false) {
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// the returned list is itself the list we need to bind to
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// NOTE: I am ignoring the DataMember parameter... ideally we might have
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// thrown an exception, but this would mess up design-time usage
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// where the user may change the data source from a DataSet to a
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// DataTable.
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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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ITypedList typedMemberList = (ITypedList)memberList;
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PropertyDescriptorCollection propDescs = typedMemberList.GetItemProperties(new PropertyDescriptor[0]);
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if ((propDescs != null) && (propDescs.Count != 0)) {
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PropertyDescriptor listProperty = null;
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if (String.IsNullOrEmpty(dataMember)) {
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listProperty = propDescs[0];
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}
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else {
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listProperty = propDescs.Find(dataMember, true);
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}
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if (listProperty != null) {
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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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return (IEnumerable)list;
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}
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}
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throw new HttpException(SR.GetString(SR.ListSource_Missing_DataMember, dataMember));
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}
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else {
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throw new HttpException(SR.GetString(SR.ListSource_Without_DataMembers));
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}
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}
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}
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if (dataSource is IEnumerable) {
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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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