Compares two sequences by comparing their items instead of their references. Also checks the case that both sequences are null. In this case the method returns true. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:IEnumerable

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Description

Compares two sequences by comparing their items instead of their references. Also checks the case that both sequences are null. In this case the method returns true.

Demo Code

//   Copyright (c) Slash Games. All rights reserved.
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Collections;

public class Main{
        /// <summary>
        ///   Compares two sequences by comparing their items instead of their references. Also checks the case that
        ///   both sequences are null. In this case the method returns true.
        /// </summary>
        /// <typeparam name="T">Type of items inside sequences.</typeparam>
        /// <param name="sequence1">First sequence.</param>
        /// <param name="sequence2">Second sequence.</param>
        /// <param name="comparer">Comparer to check equality between two objects.</param>
        /// <returns>
        ///   True if the sequences are equal (i.e. the sequences contain equal items in the same order), else false.
        /// </returns>
        public static bool SequenceEqual<T>(
            IEnumerable<T> sequence1, IEnumerable<T> sequence2, IEqualityComparer<T> comparer)
        {/*  ww  w.j  av  a2s  .c  om*/
            return sequence1 == sequence2
                   || sequence1 != null && sequence2 != null && sequence1.SequenceEqual(sequence2, comparer);
        }
        /// <summary>
        ///   Compares two sequences by comparing their items instead of their references. Also checks the case that
        ///   both sequences are null. In this case the method returns true.
        /// </summary>
        /// <typeparam name="T">Type of items inside sequences.</typeparam>
        /// <param name="sequence1">First sequence.</param>
        /// <param name="sequence2">Second sequence.</param>
        /// <returns>
        ///   True if the sequences are equal (i.e. the sequences contain equal items in the same order), else false.
        /// </returns>
        public static bool SequenceEqual<T>(IEnumerable<T> sequence1, IEnumerable<T> sequence2)
        {
            return sequence1 == sequence2
                   || sequence1 != null && sequence2 != null && sequence1.SequenceEqual(sequence2);
        }
}

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