Checks whether a collection is the same as another collection. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:ICollection

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Description

Checks whether a collection is the same as another collection.

Demo Code


using System.Collections;

public class Main{
        /// <summary>
      ///     Checks whether a collection is the same as another collection.
      /// </summary>
      /// <param name="listA">The list A.</param>
      /// <param name="listB">The list B.</param>
      /// <returns>
      ///     True if the two collections contain all the same items in the same order.
      /// </returns>
      public static bool IsEqualTo(IEnumerable listA, IEnumerable listB)
      {/*w ww  .  j a v  a  2 s. com*/
         if (ReferenceEquals(listA, listB))
         {
            return true;
         }

         //if (listA == listB)
         if (Equals(listA, listB))
         {
            return true;
         }

         if ((listA == null) || (listB == null))
         {
            return false;
         }

         var enumeratorA = listA.GetEnumerator();
         var enumeratorB = listB.GetEnumerator();

         var enumAHasValue = enumeratorA.MoveNext();
         var enumBHasValue = enumeratorB.MoveNext();

         while (enumAHasValue && enumBHasValue)
         {
            var currentA = enumeratorA.Current;
            var currentB = enumeratorB.Current;

            if (currentA == currentB)
            {
               enumAHasValue = enumeratorA.MoveNext();
               enumBHasValue = enumeratorB.MoveNext();

               continue;
            }

            if (!ObjectHelper.AreEqual(currentA, currentB))
            {
               return false;
            }

            enumAHasValue = enumeratorA.MoveNext();
            enumBHasValue = enumeratorB.MoveNext();
         }

         // If we get here, and both enumerables don't have any value left, they are equal
         return !(enumAHasValue || enumBHasValue);
      }
}

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