Easiest way to compare arrays in C#

You could use Enumerable.SequenceEqual. This works for any IEnumerable<T>, not just arrays.

Use Enumerable.SequenceEqual in LINQ.

int[] arr1 = new int[] { 1,2,3};int[] arr2 = new int[] { 3,2,1 };Console.WriteLine(arr1.SequenceEqual(arr2)); // falseConsole.WriteLine(arr1.Reverse().SequenceEqual(arr2)); // true

Also for arrays (and tuples) you can use new interfaces from .NET 4.0: IStructuralComparable and IStructuralEquatable. Using them you can not only check equality of arrays but also compare them.

static class StructuralExtensions{    public static bool StructuralEquals<T>(this T a, T b)        where T : IStructuralEquatable    {        return a.Equals(b, StructuralComparisons.StructuralEqualityComparer);    }    public static int StructuralCompare<T>(this T a, T b)        where T : IStructuralComparable    {        return a.CompareTo(b, StructuralComparisons.StructuralComparer);    }}{    var a = new[] { 1, 2, 3 };    var b = new[] { 1, 2, 3 };    Console.WriteLine(a.Equals(b)); // False    Console.WriteLine(a.StructuralEquals(b)); // True}{    var a = new[] { 1, 3, 3 };    var b = new[] { 1, 2, 3 };    Console.WriteLine(a.StructuralCompare(b)); // 1}