C# Linq intersect/except with one part of object

Question

I\'ve got a class:

class ThisClass
{
  private string a {get; set;}
  private string b {get; set;}
}

I would like to use the Intersect and

Answer 1

You should create IEqualityComparer. You can pass the IEqualityComparer to Intersect() method. This will help you get List(which intersect with bar) easier.

var intersectionList = foo.Intersect(bar, new ThisClassEqualityComparer()).ToList();


class ThisClassEqualityComparer : IEqualityComparer
{

    public bool Equals(ThisClass b1, ThisClass b2)
    {
        return b1.a == b2.a;
    }


    public int GetHashCode(Box bx)
    {
       // To ignore to compare hashcode, please consider this.
       // I would like to force Equals() to be called
       return 0;
    }

}