Question

Possible Duplicate:
Comparing two List<string> for equality

How can I find out whether two arrays of string are equal to each other?

I used this, but it does not work, even though the contents of both are the same.

string[] array1 = new string[]{"A" , "B"}

string[] array2 = new string[]{"A" , "B"}

if(array1 == array2)  // it return false !!!!
{
  // 
}

Answer 1

static bool ArraysEqual<T>(T[] a1, T[] a2)
{
    if (ReferenceEquals(a1,a2))
        return true;

    if (a1 == null || a2 == null)
        return false;

    if (a1.Length != a2.Length)
        return false;

    EqualityComparer<T> comparer = EqualityComparer<T>.Default;
    for (int i = 0; i < a1.Length; i++)
    {
        if (!comparer.Equals(a1[i], a2[i])) return false;
    }
    return true;
}