Checking for duplicates in a List of Objects C#

Question

I am looking for a really fast way to check for duplicates in a list of objects.

I was thinking of simply looping through the list and doing a manual comparison th

Answer 1

If any duplicate occurs throws exception. Dictionary checks keys by itself. this is the easiest way.

try
{
  dupList.ToDictionary(a=>new {a.checkThis,a.checkThat});
}
catch{
 //message: list items is not uniqe
}