Question

I have List<MyObject> listObjects where I would like a unique list of MyObject.CategoryName as List<string>.

I have the following linq so far.

var categoryNames = from element in listObjects
orderby element.CategoryName
group element by element.CategoryName;

However, var categoryNames is a IEnumerable<IGrouping<string, MyObject>>.

How can I get the list as a List<string>?

thank you.

Answer 1

var categoryNames = listObjects.Select(x => x.CategoryName).Distinct().ToList();

In words: “Grab only the category names, and then ignore duplicates, and put them into a list.”