The SequenceEqual operator

1. What is the SequenceEqual operator?

2. What is the signature of the SequenceEqual operator?

The SequenceEqual operator compares two sequences. If the two sequences have the same number of items and each item in the same position is equal the SequenceEqual operator returns true.

 

public static bool SequenceEqual<TSource>(

    this IEnumerable<TSource> first,

    IEnumerable<TSource> second);

 

public static bool SequenceEqual<TSource>(

    this IEnumerable<TSource> first,

    IEnumerable<TSource> second,

    IEqualityComparer<TSource> comparer);

 

Example 1:

 

            var customers1 = from c in Data.Customers

                             orderby c.Name

                             select c;

 

            var customers2 = from c in Data.Customers

                             orderby c.Name

                             select c;

 

 

            Trace.WriteLine(customers1.SequenceEqual(customers2));

 

            var customers3 = from c in Data.Customers

                             orderby c.Name descending

                             select c;

 

            Trace.WriteLine(customers3.SequenceEqual(customers1));

 

Output:

 

True

False