SortDescriptionCollection.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / ComponentModel / SortDescriptionCollection.cs / 1 / SortDescriptionCollection.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) 2003 by Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: dynamic collection of SortDescriptions 
//
// See spec at [....]/connecteddata/Specs/CollectionView.mht 
//
// History:
//  03/24/2005 : [....]   - created
// 
//---------------------------------------------------------------------------
using System; 
using System.Collections; 
using System.Collections.ObjectModel;
using System.Collections.Specialized; 
using System.Windows;

using MS.Utility;
 
namespace System.ComponentModel
{ 
    ///  
    /// Implementation of a dynamic data collection of SortDescriptions.
    ///  
    public class SortDescriptionCollection : Collection, INotifyCollectionChanged
    {
        //-----------------------------------------------------
        // 
        //  Public Events
        // 
        //----------------------------------------------------- 

        #region Public Events 

        /// 
        /// Occurs when the collection changes, either by adding or removing an item.
        ///  
        /// 
        /// see  
        ///  
        event NotifyCollectionChangedEventHandler INotifyCollectionChanged.CollectionChanged
        { 
            add
            {
                CollectionChanged += value;
            } 
            remove
            { 
                CollectionChanged -= value; 
            }
        } 

        /// 
        /// Occurs when the collection changes, either by adding or removing an item.
        ///  
        protected event NotifyCollectionChangedEventHandler CollectionChanged;
 
        #endregion Public Events 

 
        //------------------------------------------------------
        //
        //  Protected Methods
        // 
        //-----------------------------------------------------
 
        #region Protected Methods 

        ///  
        /// called by base class Collection<T> when the list is being cleared;
        /// raises a CollectionChanged event to any listeners
        /// 
        protected override void ClearItems() 
        {
            base.ClearItems(); 
            OnCollectionChanged(NotifyCollectionChangedAction.Reset); 
        }
 
        /// 
        /// called by base class Collection<T> when an item is removed from list;
        /// raises a CollectionChanged event to any listeners
        ///  
        protected override void RemoveItem(int index)
        { 
            SortDescription removedItem = this[index]; 
            base.RemoveItem(index);
            OnCollectionChanged(NotifyCollectionChangedAction.Remove, removedItem, index); 
        }

        /// 
        /// called by base class Collection<T> when an item is added to list; 
        /// raises a CollectionChanged event to any listeners
        ///  
        protected override void InsertItem(int index, SortDescription item) 
        {
            item.Seal(); 
            base.InsertItem(index, item);
            OnCollectionChanged(NotifyCollectionChangedAction.Add, item, index);
        }
 
        /// 
        /// called by base class Collection<T> when an item is set in the list; 
        /// raises a CollectionChanged event to any listeners 
        /// 
        protected override void SetItem(int index, SortDescription item) 
        {
            item.Seal();
            SortDescription originalItem = this[index];
            base.SetItem(index, item); 
            OnCollectionChanged(NotifyCollectionChangedAction.Remove, originalItem, index);
            OnCollectionChanged(NotifyCollectionChangedAction.Add, item, index); 
        } 

        ///  
        /// raise CollectionChanged event to any listeners
        /// 
        private void OnCollectionChanged(NotifyCollectionChangedAction action, object item, int index)
        { 
            if (CollectionChanged != null)
            { 
                CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, item, index)); 
            }
        } 
        // raise CollectionChanged event to any listeners
        void OnCollectionChanged(NotifyCollectionChangedAction action)
        {
            if (CollectionChanged != null) 
            {
                CollectionChanged(this, new NotifyCollectionChangedEventArgs(action)); 
            } 
        }
        #endregion Protected Methods 


        /// 
        /// Immutable, read-only SortDescriptionCollection 
        /// 
        class EmptySortDescriptionCollection : SortDescriptionCollection, IList 
        { 
            //------------------------------------------------------
            // 
            //  Protected Methods
            //
            //------------------------------------------------------
 
            #region Protected Methods
 
            ///  
            /// called by base class Collection<T> when the list is being cleared;
            /// raises a CollectionChanged event to any listeners 
            /// 
            protected override void ClearItems()
            {
                throw new NotSupportedException(); 
            }
 
            ///  
            /// called by base class Collection<T> when an item is removed from list;
            /// raises a CollectionChanged event to any listeners 
            /// 
            protected override void RemoveItem(int index)
            {
                throw new NotSupportedException(); 
            }
 
            ///  
            /// called by base class Collection<T> when an item is added to list;
            /// raises a CollectionChanged event to any listeners 
            /// 
            protected override void InsertItem(int index, SortDescription item)
            {
                throw new NotSupportedException(); 
            }
 
            ///  
            /// called by base class Collection<T> when an item is set in list;
            /// raises a CollectionChanged event to any listeners 
            /// 
            protected override void SetItem(int index, SortDescription item)
            {
                throw new NotSupportedException(); 
            }
 
            #endregion Protected Methods 

            #region IList Implementations 

            // explicit implementation to override the IsReadOnly and IsFixedSize properties

            bool IList.IsFixedSize 
            {
                  get { return true; } 
            } 

            bool IList.IsReadOnly 
            {
                  get { return true; }
            }
            #endregion IList Implementations 

        } 
 
        /// 
        /// returns an empty and non-modifiable SortDescriptionCollection 
        /// 
        public static readonly SortDescriptionCollection Empty = new EmptySortDescriptionCollection();

    } 
}
 
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SortDescriptionCollection.cs source code in C# .NET

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