List<Uri>.OrderBy() sort order based upon Contains()?

Question

I have a standard List<Uri> defined that contains a short list of items. I'd like to iterate over the list using a foreach() but would like to 'bring to the top' those items that contain a specific string value in order to process them first. Is this possible with the OrderBy() and, better yet, is it possible in a single line? Thanks!

Answer 1

You can do that:

foreach(var uri in uriList.OrderByDescending(uri => uri.ToString().Contains("foo"))
{
    // Use uri

Answer 2

Yes. you can use OrderByDescending() using an order that returns a boolean - example:

var results = items.OrderByDescending( x => x.Name=="Herbert").ToList();

In this case the order would return true for "Herbert" and false for all other values. All true values will be ordered after all false values - we reverse the order by using OrderByDescending() and have the desired outcome.

Adapted to your Uri list and Contains() which also returns a boolean this would mean:

foreach(var uri in uriList.OrderByDescending(x => x.ToString().Contains(someString))
{
   //..
}