Convert the list to a Dictionary using the keySelector to extract keys from values and the specified comparer. Optimized for IList of T input. No checking for other types. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:IList

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Description

Convert the list to a Dictionary using the keySelector to extract keys from values and the specified comparer. Optimized for IList of T input. No checking for other types.

Demo Code

// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.Linq;
using System.Diagnostics.Contracts;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System;//from   w w w .  ja v a  2s. c  o  m

public class Main{
        /// <summary>
        /// Convert the list to a Dictionary using the keySelector to extract keys from values and the specified comparer. Optimized for IList of T input. No checking for other types.
        /// </summary>
        private static Dictionary<TKey, TValue> ToDictionaryFastNoCheck<TKey, TValue>(IList<TValue> list, Func<TValue, TKey> keySelector, IEqualityComparer<TKey> comparer)
        {
            Contract.Assert(list != null);
            Contract.Assert(keySelector != null);

            int listCount = list.Count;
            Dictionary<TKey, TValue> dictionary = new Dictionary<TKey, TValue>(listCount, comparer);
            for (int i = 0; i < listCount; i++)
            {
                TValue value = list[i];
                dictionary.Add(keySelector(value), value);
            }
            return dictionary;
        }
}

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