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//-----------------------------------------------------------------------
// <copyright file="KeyedCollectionDelegate.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.Messaging {
using System;
using System.Collections.ObjectModel;
using System.Diagnostics.Contracts;
/// <summary>
/// A KeyedCollection whose item -> key transform is provided via a delegate
/// to its constructor, and null items are disallowed.
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TItem">The type of the item.</typeparam>
[Serializable]
internal class KeyedCollectionDelegate<TKey, TItem> : KeyedCollection<TKey, TItem> {
/// <summary>
/// The delegate that returns a key for the given item.
/// </summary>
private Func<TItem, TKey> getKeyForItemDelegate;
/// <summary>
/// Initializes a new instance of the KeyedCollectionDelegate class.
/// </summary>
/// <param name="getKeyForItemDelegate">The delegate that gets the key for a given item.</param>
internal KeyedCollectionDelegate(Func<TItem, TKey> getKeyForItemDelegate) {
Requires.NotNull(getKeyForItemDelegate, "getKeyForItemDelegate");
this.getKeyForItemDelegate = getKeyForItemDelegate;
}
/// <summary>
/// When implemented in a derived class, extracts the key from the specified element.
/// </summary>
/// <param name="item">The element from which to extract the key.</param>
/// <returns>The key for the specified element.</returns>
protected override TKey GetKeyForItem(TItem item) {
ErrorUtilities.VerifyArgumentNotNull(item, "item"); // null items not supported.
return this.getKeyForItemDelegate(item);
}
}
}
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