Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ListSourceHelper.cs / 1 / ListSourceHelper.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System.Collections; using System.ComponentModel; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public static class ListSourceHelper { public static bool ContainsListCollection(IDataSource dataSource) { ICollection viewNames = dataSource.GetViewNames(); if (viewNames != null && viewNames.Count > 0) { return true; } return false; } public static IList GetList(IDataSource dataSource) { ICollection viewNames = dataSource.GetViewNames(); if (viewNames != null && viewNames.Count > 0) { return new ListSourceList(dataSource); } return null; } internal sealed class ListSourceList : CollectionBase, ITypedList { IDataSource _dataSource; public ListSourceList(IDataSource dataSource) { _dataSource = dataSource; ((IList)this).Add(new ListSourceRow(_dataSource)); } #region ITypedList implementation string ITypedList.GetListName(PropertyDescriptor[] listAccessors) { return String.Empty; } PropertyDescriptorCollection ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors) { if (_dataSource != null) { ICollection viewNames = _dataSource.GetViewNames(); if (viewNames != null && viewNames.Count > 0) { string[] viewNamesArray = new string[viewNames.Count]; viewNames.CopyTo(viewNamesArray, 0); PropertyDescriptor[] props = new PropertyDescriptor[viewNames.Count]; for (int i = 0; i < viewNamesArray.Length; i++) { props[i] = new ListSourcePropertyDescriptor(viewNamesArray[i]); } return new PropertyDescriptorCollection(props); } } return new PropertyDescriptorCollection(null); } #endregion ITypedList implementations } internal class ListSourceRow { IDataSource _dataSource; public ListSourceRow(IDataSource dataSource) { _dataSource = dataSource; } public IDataSource DataSource { get { return _dataSource; } } } internal class ListSourcePropertyDescriptor : PropertyDescriptor { string _name; public ListSourcePropertyDescriptor(string name) : base(name, null) { _name = name; } public override Type ComponentType { get { return typeof(ListSourceRow); } } public override bool IsReadOnly { get { return true; } } public override Type PropertyType { get { return typeof(IEnumerable); } } public override bool CanResetValue(object value) { return false; } public override object GetValue(object source) { if (source is ListSourceRow) { ListSourceRow row = (ListSourceRow)source; IDataSource dataSource = row.DataSource; return dataSource.GetView(_name).ExecuteSelect(DataSourceSelectArguments.Empty); } return null; } public override void ResetValue(object component) { throw new NotSupportedException(); } public override void SetValue(object component, object value) { throw new NotSupportedException(); } public override bool ShouldSerializeValue(object component) { return false; } } } }
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