Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / ListDataHelper.cs / 1305376 / ListDataHelper.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System.Collections; using System.Diagnostics; namespace System.Web.UI.MobileControls { /* * List Data Helper class. * * Copyright (c) 2000 Microsoft Corporation */ [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.")] internal sealed class ListDataHelper { private IListControl _parent; private StateBag _parentViewState; private MobileListItemCollection _items; private Object _dataSource; private IEnumerable _resolvedDataSource; private int _dataSourceCount = -1; private String _dataTextField; private String _dataValueField; private bool _bindFromFields; internal /*public*/ ListDataHelper(IListControl parent, StateBag parentViewState) { _parent = parent; _parentViewState = parentViewState; } internal /*public*/ MobileListItemCollection Items { get { if (_items == null) { _items = new MobileListItemCollection(); if (_parent.TrackingViewState) { ((IStateManager)_items).TrackViewState(); } } return _items; } } internal /*public*/ bool HasItems() { return _items != null; } internal /*public*/ Object DataSource { get { return _dataSource; } set { _dataSource = value; _resolvedDataSource = null; } } internal /*public*/ String DataMember { get { String s = (String)_parentViewState["DataMember"]; return s == null ? String.Empty : s; } set { _parentViewState["DataMember"] = value; } } internal /*public*/ String DataTextField { get { String s = (String)_parentViewState["DataTextField"]; return (s != null) ? s : String.Empty; } set { _parentViewState["DataTextField"] = value; } } internal /*public*/ String DataValueField { get { String s = (String)_parentViewState["DataValueField"]; return (s != null) ? s : String.Empty; } set { _parentViewState["DataValueField"] = value; } } internal /*public*/ IEnumerable ResolvedDataSource { get { if (_resolvedDataSource == null) { _resolvedDataSource = DataSourceHelper.GetResolvedDataSource(DataSource, DataMember); } return _resolvedDataSource; } } /* internal int DataSourceCount { get { if (_dataSourceCount == -1) { IEnumerable dataSource = ResolvedDataSource; if (dataSource != null) { ICollection collection = dataSource as ICollection; if (collection != null) { _dataSourceCount = collection.Count; } else { int count = 0; IEnumerator enumerator = dataSource.GetEnumerator(); while (enumerator.MoveNext()) { count++; } _dataSourceCount = count; } } else { _dataSourceCount = 0; } } return _dataSourceCount; } } */ internal /*public*/ void CreateItems(IEnumerable dataSource) { Debug.Assert (dataSource != null); Items.Clear(); _dataTextField = DataTextField; _dataValueField = DataValueField; _bindFromFields = (_dataTextField.Length > 0) || (_dataValueField.Length > 0); foreach (Object dataItem in dataSource) { MobileListItem listItem = CreateItem(dataItem); if (listItem != null) { AddItem(listItem); } } _dataSourceCount = Items.Count; } private MobileListItem CreateItem(Object dataItem) { MobileListItem listItem = null; String textField = null; String valueField = null; if (_bindFromFields) { if (_dataTextField.Length > 0) { textField = DataBinder.GetPropertyValue(dataItem, _dataTextField, "{0}"); } if (_dataValueField.Length > 0) { valueField = DataBinder.GetPropertyValue(dataItem, _dataValueField, "{0}"); } } else { textField = dataItem.ToString(); } listItem = new MobileListItem(dataItem, textField, valueField); // Use delegated data binding, if specified. if (dataItem != null) { _parent.OnItemDataBind(new ListDataBindEventArgs(listItem, dataItem)); } return listItem; } internal /*public*/ void AddItem(MobileListItem item) { MobileListItemCollection items = Items; items.Add(item); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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