Question

private class CompAdvertisements : IComparer<Advertisements>
{
private string OrderBy { get; set; }

public CompAdvertisements(string orderBy)
{
OrderBy = orderBy;
}

#region IComparer<Advertisements> Members

public int Compare(Advertisements x, Advertisements y)
{
return x.Country.Name.CompareTo(y.Country.Name);

Can i also user x.Name.CompareTo(y.Name); in comparer that i will compare with two elements lik order by something and order by something2

Answer 1

Yes. If the outer comparison indicates that your two elements (Country.Name) are the same, then you instead return the result of an inner comparison (somethingElse). You can do that for an arbitrary depth of comparisons.

outerCompare = x.Country.Name.CompareTo(y.Country.Name);
if (outerCompare != 0)
{
    return outerCompare;
}
else
{
    return (x.Name.CompareTo(y.Name));
}