Implement IEqualityComparer

Question

I would like to get distinct objects from a list. I tried to implement IEqualityComparer but wasn\'t successful. Please review my code and give me an explanation fo

Answer 1

IEqualityComparer is an interface which is used to find whether an object is equal or not. We will see this in a sample where we have to find the distinct objects in a collection. This interface will implement the method Equals(T obj1,T obj2).

abstract public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Address { set; get; }
}

public enum SortType
{
    ByID,
    BySalary
}

public class EmployeeDistinctEquality : IEqualityComparer
{
    public EmployeeDistinctEquality()
    {

    }

    public bool Equals(Employee x, Employee y)
    {
        if (x == null && y == null)
            return true;
        else if (x == null || y == null)
            return false;
        else if (x.Id == y.Id)
            return true;
        else
            return false;
    }

    public int GetHashCode(Employee obj)
    {
        return obj.Id.GetHashCode();
    }
}

Refer to this link for more detailed information:

http://dotnetvisio.blogspot.in/2015/12/usage-of-icomparer-icomparable-and.html