Code:
/ DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / webcontrols / ListViewPagedDataSource.cs / 1 / ListViewPagedDataSource.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Security.Permissions; using System.Web; using System.Web.Resources; using System.Web.UI; namespace System.Web.UI.WebControls { [ AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal), AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal), SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix", Justification = "Type is a generalized data structure that happens to implement ICollection"), ] public class ListViewPagedDataSource : ICollection, ITypedList { private IEnumerable _dataSource; private bool _allowServerPaging; private int _startRowIndex; private int _maximumRows; private int _totalRowCount; ////// public ListViewPagedDataSource() { _allowServerPaging = false; _totalRowCount = 0; } ///Initializes a new instance of the ///class. /// public bool AllowServerPaging { get { return _allowServerPaging; } set { _allowServerPaging = value; } } ///Indicates whether to implement page semantics on top of the underlying datasource. ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public int Count { get { if (_dataSource == null) return 0; if (IsLastPage == false) { // In custom paging the datasource can contain at most // a single page's worth of data. // In non-custom paging, all pages except last one have // a full page worth of data. if (MaximumRows >= 0) { return MaximumRows; } else { return DataSourceCount - StartRowIndex; } } else { // last page might have fewer items in datasource return DataSourceCount - StartRowIndex; } } } ////// Specifies the number of items /// to be used from the datasource. ////// public IEnumerable DataSource { get { return _dataSource; } set { _dataSource = value; } } ///Indicates the data source. ////// public int DataSourceCount { get { if (_dataSource == null) return 0; if (IsServerPagingEnabled) { return _totalRowCount; } else { if (_dataSource is ICollection) { return ((ICollection)_dataSource).Count; } else { // The caller should not call this in the case of an IEnumerator datasource // This is required for paging, but the assumption is that the user will set // up custom paging. throw new InvalidOperationException(AtlasWeb.ListViewPagedDataSource_CannotGetCount); } } } } ////// private bool IsLastPage { get { if (StartRowIndex + MaximumRows >= DataSourceCount) return true; else return false; } } ////// public bool IsReadOnly { get { return false; } } ////// Indicates whether server-side paging is enabled /// public bool IsServerPagingEnabled { get { return _allowServerPaging; } } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public bool IsSynchronized { get { return false; } } public int MaximumRows { get { return _maximumRows; } set { _maximumRows = value; } } public int StartRowIndex { get { return _startRowIndex; } set { _startRowIndex = value; } } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public object SyncRoot { get { return this; } } ////// public int TotalRowCount { get { return _totalRowCount; } set { _totalRowCount = value; } } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public void CopyTo(Array array, int index) { for (IEnumerator e = this.GetEnumerator(); e.MoveNext(); ) array.SetValue(e.Current, index++); } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public IEnumerator GetEnumerator() { int startRowIndex = 0; int count = -1; if (!IsServerPagingEnabled) { startRowIndex = StartRowIndex; } if (_dataSource is ICollection) { count = Count; } if (_dataSource is IList) { return new EnumeratorOnIList((IList)_dataSource, startRowIndex, count); } else if (_dataSource is Array) { return new EnumeratorOnArray((object[])_dataSource, startRowIndex, count); } else if (_dataSource is ICollection) { return new EnumeratorOnICollection((ICollection)_dataSource, startRowIndex, count); } else { if (_allowServerPaging) { // startRowIndex does not matter // however count does... even if the data source contains more than 1 page of data in // it, we only want to enumerate over a single page of data // note: we can call Count here, even though we're dealing with an IEnumerator // because by now we have ensured that we're in custom paging mode return new EnumeratorOnIEnumerator(_dataSource.GetEnumerator(), Count); } else { // startRowIndex and count don't matter since we're going to enumerate over all the // data (either non-paged or custom paging scenario) return _dataSource.GetEnumerator(); } } } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) { if (_dataSource == null) return null; if (_dataSource is ITypedList) { return ((ITypedList)_dataSource).GetItemProperties(listAccessors); } return null; } ////// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public string GetListName(PropertyDescriptor[] listAccessors) { return String.Empty; } ////// private sealed class EnumeratorOnIEnumerator : IEnumerator { private IEnumerator realEnum; private int index; private int indexBounds; public EnumeratorOnIEnumerator(IEnumerator realEnum, int count) { this.realEnum = realEnum; this.index = -1; this.indexBounds = count; } public object Current { get { return realEnum.Current; } } public bool MoveNext() { bool result = realEnum.MoveNext(); index++; return result && (index < indexBounds); } public void Reset() { realEnum.Reset(); index = -1; } } ////// private sealed class EnumeratorOnICollection : IEnumerator { private ICollection collection; private IEnumerator collectionEnum; private int startRowIndex; private int index; private int indexBounds; public EnumeratorOnICollection(ICollection collection, int startRowIndex, int count) { this.collection = collection; this.startRowIndex = startRowIndex; this.index = -1; this.indexBounds = startRowIndex + count; if (indexBounds > collection.Count) { indexBounds = collection.Count; } } public object Current { get { return collectionEnum.Current; } } public bool MoveNext() { if (collectionEnum == null) { collectionEnum = collection.GetEnumerator(); for (int i = 0; i < startRowIndex; i++) collectionEnum.MoveNext(); } collectionEnum.MoveNext(); index++; return (startRowIndex + index) < indexBounds; } public void Reset() { collectionEnum = null; index = -1; } } ////// private sealed class EnumeratorOnIList : IEnumerator { private IList collection; private int startRowIndex; private int index; private int indexBounds; public EnumeratorOnIList(IList collection, int startRowIndex, int count) { this.collection = collection; this.startRowIndex = startRowIndex; this.index = -1; this.indexBounds = startRowIndex + count; if (indexBounds > collection.Count) { indexBounds = collection.Count; } } public object Current { get { if (index < 0) { throw new InvalidOperationException(AtlasWeb.ListViewPagedDataSource_EnumeratorMoveNextNotCalled); } return collection[startRowIndex + index]; } } public bool MoveNext() { index++; return (startRowIndex + index) < indexBounds; } public void Reset() { index = -1; } } ////// private sealed class EnumeratorOnArray : IEnumerator { private object[] array; private int startRowIndex; private int index; private int indexBounds; public EnumeratorOnArray(object[] array, int startRowIndex, int count) { this.array = array; this.startRowIndex = startRowIndex; this.index = -1; this.indexBounds = startRowIndex + count; if (indexBounds > array.Length) { indexBounds = array.Length; } } public object Current { get { if (index < 0) { throw new InvalidOperationException(AtlasWeb.ListViewPagedDataSource_EnumeratorMoveNextNotCalled); } return array[startRowIndex + index]; } } public bool MoveNext() { index++; return (startRowIndex + index) < indexBounds; } public void Reset() { index = -1; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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