Coalescing in LINQ query

Question

I have these code :

var result = new Collection<object>();

result.Add(list.Select(s => new
               {
                   s.ID,
                   s.Users
               })
           );

Users is a collection which means it can contains multiple names for example "John", "Rick", "Tom" , etc. I want to coalsescing it into one string "John, Rick, Tom" . Any idea how to achieve this result?

Thank you

UPDATE :

Answer

var result = new Collection<object>();

result.Add(list.Select(s => new
               {
                   s.ID,
                   Users = string.Join(",", s.Users)
               })
           );

Answer 1

Directly from your code, it's easier to just go to

result.Add(list.Select(s => new
                {s.ID, string.Join(",",s.Users)}));

That should return you a list of pairs with ID, and joined strings of users delimited by ",".

Answer 2

If Users is a List, you can use the following code:

var result = new Collection<object>();

result.Add(list.Select(s => new
               {
                   s.ID,
                   string.Join(",", s.Users.ToArray())   
               })
           );

Also, you can check this similar question : C# List to string with delimiter