How to find out whether two string arrays are equal to other [duplicate]

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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(a开发者_开发技巧rray1 == array2)  // it return false !!!!
{
  // 
}

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If you have access to Linq, use SequenceEqual. Otherwise, simply provide the code to first check if the arrays are equal length, and then if items are equal at each index.

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Have a look at the following on StackOverflow. I believe what you are looking for is the following. Comparing arrays in C#

var arraysAreEqual = Enumerable.SequenceEqual(array1, array2);

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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;
}

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You can use the .NET4 feature Array.IStructuralEquatable.Equals like this:

IStructuralEquatable equ = array1;
bool areEqual = equ.Equals(array2, EqualityComparer<string>.Default);

This can also be written on one line:

bool areEqual = (array1 as IStructuralEquatable).Equals(array2, EqualityComparer<string>.Default);

Using IStructuralEquatable has the advantage of allowing a custom comparer to be used.