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#if !NETFX_CORE
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// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.Collections;
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using System.Diagnostics;
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namespace PlatformSupport.Collections.Specialized
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{
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public delegate void NotifyCollectionChangedEventHandler(object sender, PlatformSupport.Collections.Specialized.NotifyCollectionChangedEventArgs e);
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public interface INotifyCollectionChanged
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{
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event NotifyCollectionChangedEventHandler CollectionChanged;
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}
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/// <summary>
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/// This enum describes the action that caused a CollectionChanged event.
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/// </summary>
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public enum NotifyCollectionChangedAction
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{
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/// <summary> One or more items were added to the collection. </summary>
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Add,
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/// <summary> One or more items were removed from the collection. </summary>
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Remove,
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/// <summary> One or more items were replaced in the collection. </summary>
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Replace,
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/// <summary> One or more items were moved within the collection. </summary>
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Move,
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/// <summary> The contents of the collection changed dramatically. </summary>
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Reset,
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}
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/// <summary>
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/// Arguments for the CollectionChanged event.
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/// A collection that supports INotifyCollectionChangedThis raises this event
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/// whenever an item is added or removed, or when the contents of the collection
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/// changes dramatically.
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/// </summary>
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public class NotifyCollectionChangedEventArgs : EventArgs
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{
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//------------------------------------------------------
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//
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// Constructors
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//
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//------------------------------------------------------
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a reset change.
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/// </summary>
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/// <param name="action">The action that caused the event (must be Reset).</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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throw new ArgumentException("action");
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InitializeAdd(action, null, -1);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a one-item change.
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/// </summary>
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/// <param name="action">The action that caused the event; can only be Reset, Add or Remove action.</param>
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/// <param name="changedItem">The item affected by the change.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, object changedItem)
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{
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if ((action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Add) && (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Remove)
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&& (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset))
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throw new ArgumentException("action");
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if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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{
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if (changedItem != null)
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throw new ArgumentException("action");
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InitializeAdd(action, null, -1);
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}
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else
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{
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InitializeAddOrRemove(action, new object[] { changedItem }, -1);
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}
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a one-item change.
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/// </summary>
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/// <param name="action">The action that caused the event.</param>
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/// <param name="changedItem">The item affected by the change.</param>
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/// <param name="index">The index where the change occurred.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, object changedItem, int index)
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{
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if ((action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Add) && (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Remove)
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&& (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset))
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throw new ArgumentException("action");
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if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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{
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if (changedItem != null)
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throw new ArgumentException("action");
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if (index != -1)
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throw new ArgumentException("action");
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InitializeAdd(action, null, -1);
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}
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else
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{
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InitializeAddOrRemove(action, new object[] { changedItem }, index);
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}
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a multi-item change.
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/// </summary>
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/// <param name="action">The action that caused the event.</param>
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/// <param name="changedItems">The items affected by the change.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList changedItems)
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{
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if ((action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Add) && (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Remove)
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&& (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset))
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throw new ArgumentException("action");
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if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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{
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if (changedItems != null)
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throw new ArgumentException("action");
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InitializeAdd(action, null, -1);
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}
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else
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{
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if (changedItems == null)
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throw new ArgumentNullException("changedItems");
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InitializeAddOrRemove(action, changedItems, -1);
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}
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a multi-item change (or a reset).
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/// </summary>
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/// <param name="action">The action that caused the event.</param>
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/// <param name="changedItems">The items affected by the change.</param>
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/// <param name="startingIndex">The index where the change occurred.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList changedItems, int startingIndex)
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{
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if ((action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Add) && (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Remove)
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&& (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset))
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throw new ArgumentException("action");
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if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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{
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if (changedItems != null)
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throw new ArgumentException("action");
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if (startingIndex != -1)
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throw new ArgumentException("action");
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InitializeAdd(action, null, -1);
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}
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else
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{
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if (changedItems == null)
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throw new ArgumentNullException("changedItems");
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if (startingIndex < -1)
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throw new ArgumentException("startingIndex");
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InitializeAddOrRemove(action, changedItems, startingIndex);
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}
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a one-item Replace event.
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/// </summary>
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/// <param name="action">Can only be a Replace action.</param>
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/// <param name="newItem">The new item replacing the original item.</param>
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/// <param name="oldItem">The original item that is replaced.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, object newItem, object oldItem)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Replace)
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throw new ArgumentException("action");
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InitializeMoveOrReplace(action, new object[] { newItem }, new object[] { oldItem }, -1, -1);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a one-item Replace event.
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/// </summary>
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/// <param name="action">Can only be a Replace action.</param>
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/// <param name="newItem">The new item replacing the original item.</param>
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/// <param name="oldItem">The original item that is replaced.</param>
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/// <param name="index">The index of the item being replaced.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, object newItem, object oldItem, int index)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Replace)
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throw new ArgumentException("action");
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InitializeMoveOrReplace(action, new object[] { newItem }, new object[] { oldItem }, index, index);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a multi-item Replace event.
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/// </summary>
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/// <param name="action">Can only be a Replace action.</param>
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/// <param name="newItems">The new items replacing the original items.</param>
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/// <param name="oldItems">The original items that are replaced.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList newItems, IList oldItems)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Replace)
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throw new ArgumentException("action");
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if (newItems == null)
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throw new ArgumentNullException("newItems");
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if (oldItems == null)
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throw new ArgumentNullException("oldItems");
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InitializeMoveOrReplace(action, newItems, oldItems, -1, -1);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a multi-item Replace event.
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/// </summary>
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/// <param name="action">Can only be a Replace action.</param>
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/// <param name="newItems">The new items replacing the original items.</param>
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/// <param name="oldItems">The original items that are replaced.</param>
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/// <param name="startingIndex">The starting index of the items being replaced.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList newItems, IList oldItems, int startingIndex)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Replace)
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throw new ArgumentException("action");
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if (newItems == null)
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throw new ArgumentNullException("newItems");
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if (oldItems == null)
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throw new ArgumentNullException("oldItems");
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InitializeMoveOrReplace(action, newItems, oldItems, startingIndex, startingIndex);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a one-item Move event.
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/// </summary>
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/// <param name="action">Can only be a Move action.</param>
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/// <param name="changedItem">The item affected by the change.</param>
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/// <param name="index">The new index for the changed item.</param>
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/// <param name="oldIndex">The old index for the changed item.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, object changedItem, int index, int oldIndex)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Move)
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throw new ArgumentException("action");
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if (index < 0)
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throw new ArgumentException("index");
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object[] changedItems = new object[] { changedItem };
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InitializeMoveOrReplace(action, changedItems, changedItems, index, oldIndex);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs that describes a multi-item Move event.
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/// </summary>
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/// <param name="action">The action that caused the event.</param>
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/// <param name="changedItems">The items affected by the change.</param>
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/// <param name="index">The new index for the changed items.</param>
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/// <param name="oldIndex">The old index for the changed items.</param>
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public NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList changedItems, int index, int oldIndex)
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{
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if (action != PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Move)
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throw new ArgumentException("action");
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if (index < 0)
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throw new ArgumentException("index");
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InitializeMoveOrReplace(action, changedItems, changedItems, index, oldIndex);
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}
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/// <summary>
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/// Construct a NotifyCollectionChangedEventArgs with given fields (no validation). Used by WinRT marshaling.
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/// </summary>
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internal NotifyCollectionChangedEventArgs(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList newItems, IList oldItems, int newIndex, int oldIndex)
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{
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_action = action;
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_newItems = (newItems == null) ? null : new ReadOnlyList(newItems);
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_oldItems = (oldItems == null) ? null : new ReadOnlyList(oldItems);
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_newStartingIndex = newIndex;
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_oldStartingIndex = oldIndex;
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}
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private void InitializeAddOrRemove(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList changedItems, int startingIndex)
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{
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if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Add)
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InitializeAdd(action, changedItems, startingIndex);
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else if (action == PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction.Remove)
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InitializeRemove(action, changedItems, startingIndex);
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else
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Debug.Assert(false, String.Format("Unsupported action: {0}", action.ToString()));
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}
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private void InitializeAdd(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList newItems, int newStartingIndex)
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{
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_action = action;
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_newItems = (newItems == null) ? null : new ReadOnlyList(newItems);
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_newStartingIndex = newStartingIndex;
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}
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private void InitializeRemove(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList oldItems, int oldStartingIndex)
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{
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_action = action;
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_oldItems = (oldItems == null) ? null : new ReadOnlyList(oldItems);
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_oldStartingIndex = oldStartingIndex;
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}
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private void InitializeMoveOrReplace(PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction action, IList newItems, IList oldItems, int startingIndex, int oldStartingIndex)
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{
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InitializeAdd(action, newItems, startingIndex);
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InitializeRemove(action, oldItems, oldStartingIndex);
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}
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//------------------------------------------------------
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//
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// Public Properties
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//
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//------------------------------------------------------
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/// <summary>
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/// The action that caused the event.
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/// </summary>
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public PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction Action
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{
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get { return _action; }
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}
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/// <summary>
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/// The items affected by the change.
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/// </summary>
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public IList NewItems
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{
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get { return _newItems; }
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}
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/// <summary>
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/// The old items affected by the change (for Replace events).
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/// </summary>
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public IList OldItems
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{
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get { return _oldItems; }
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}
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/// <summary>
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/// The index where the change occurred.
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/// </summary>
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public int NewStartingIndex
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{
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get { return _newStartingIndex; }
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}
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/// <summary>
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/// The old index where the change occurred (for Move events).
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/// </summary>
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public int OldStartingIndex
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{
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get { return _oldStartingIndex; }
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}
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//------------------------------------------------------
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//
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// Private Fields
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//
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//------------------------------------------------------
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private PlatformSupport.Collections.Specialized.NotifyCollectionChangedAction _action;
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private IList _newItems, _oldItems;
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private int _newStartingIndex = -1;
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private int _oldStartingIndex = -1;
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}
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internal sealed class ReadOnlyList : IList
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{
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private readonly IList _list;
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internal ReadOnlyList(IList list)
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{
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Debug.Assert(list != null);
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_list = list;
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}
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public int Count
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{
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get { return _list.Count; }
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}
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public bool IsReadOnly
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{
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get { return true; }
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}
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public bool IsFixedSize
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{
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get { return true; }
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}
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public bool IsSynchronized
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{
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get { return _list.IsSynchronized; }
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}
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public object this[int index]
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{
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get
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{
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return _list[index];
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}
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set
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{
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throw new NotSupportedException();
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}
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}
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public object SyncRoot
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{
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get { return _list.SyncRoot; }
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}
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public int Add(object value)
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{
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throw new NotSupportedException();
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}
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public void Clear()
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{
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throw new NotSupportedException();
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}
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public bool Contains(object value)
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{
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return _list.Contains(value);
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}
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public void CopyTo(Array array, int index)
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{
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_list.CopyTo(array, index);
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}
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public IEnumerator GetEnumerator()
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{
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return _list.GetEnumerator();
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}
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public int IndexOf(object value)
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{
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return _list.IndexOf(value);
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}
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public void Insert(int index, object value)
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{
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throw new NotSupportedException();
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}
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public void Remove(object value)
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{
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throw new NotSupportedException();
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}
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public void RemoveAt(int index)
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{
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throw new NotSupportedException();
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}
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}
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}
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#endif
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Reference in New Issue
Block a user