问==或.Equals()

EN

class ClassName
{
    public bool Equals(ClassName other)
    {
        if (other == null)
        {
            return false;
        }
        else
        {
            //Do your equality test here.
        }
    }

    public override bool Equals(object obj)
    {
        ClassName other = obj as null; //Null and non-ClassName objects will both become null
        if (obj == null)
        {
            return false;
        }
        else
        {
            return Equals(other);
        }
    }

    public bool operator ==(ClassName left, ClassName right)
    {
        if (left == null)
        {
            return right == null;
        }
        else
        {
            return left.Equals(right);
        }
    }

    public bool operator !=(ClassName left, ClassName right)
    {
        if (left == null)
        {
            return right != null;
        }
        else
        {
            return !left.Equals(right);
        }
    }

    public override int GetHashCode()
    {
        //Return something useful here, typically all members shifted or XORed together works
    }
}