Find difference from IList<string[]> one and IList<string[]> two using Linq operation

Question

Hi is there any build in method using Linq or lambda expression or any other approach we can get records which is present and in IList<string[]> one but not in IList<string[]> two or vise versa. I tried with linq Except keyword but its not working, it's working perfect when I am doing operation on string[] not on IList<string[]> .

Answer 1

You need to implement an IEqualityComparer for string[] , arrays are compared by reference by default. Even if the elements of your arrays are same, the references are different.So the Except method treats them as different.

class ArrayComparer : IEqualityComparer<string[]>
{
    public bool Equals(string[] x, string[] y)
    {
        // do your comparison here
    }

    public int GetHashCode(string[] obj)
    {
        // write your hash algorithm 
    }

}

Then you can use this comparer by passing Except method like this:

var result = list1.Except(list2, new ArrayComparer());