Concatenating strings in C# object structure

Question

I have an object structure that looks like this:

var Results = new List<ResultObj>()
    {
        new ResultObj()
        {
            Messages = new List<MessageObj>()
            {
                new MessageObj()
                {
                    Message = "message 1"
                },
                new MessageObj()
                {
                    Message = "message 2"
                }
            }
        },
        new ResultObj()
        {
            Messages = new List<MessageObj>()
            {
                new MessageObj()
                {
                    Message = "message 3"
                }
            }
        }
    }

How do I use LINQ or another C# approach to get a single string with all the Message values concatenated together? Something like what's below

"message 1, message 2, message 3"

Thanks!

Aliostad · Accepted Answer · 2011-11-23 13:30:00Z

5

Use String.Join and SelectMany:

String.Join(", ", Results.SelectMany(x=> x.Messages).Select(y => y.Message ));

edited Nov 23, 2011 at 13:30

answered Nov 23, 2011 at 13:19

Aliostad

81.9k21 gold badges164 silver badges209 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ahmad Mageed Over a year ago

The use of SelectMany(x => x) will select the ResultObj items, not the Messages that belong to each ResultObj.

Ahmad Mageed · Accepted Answer · 2011-11-23 13:21:37Z

5

Use the Enumerable.SelectMany method to flatten the list, then use the String.Join method.

var query = Results.SelectMany(r => r.Messages)
                   .Select(m => m.Message);
var result = String.Join(", ", query);

answered Nov 23, 2011 at 13:21

Ahmad Mageed

96.9k20 gold badges170 silver badges177 bronze badges

Comments

Abbas · Accepted Answer · 2011-11-23 13:25:26Z

1

var allStrings = results.SelectMany(r => r.Messages).Select(m => m.Message);
var joined = String.Join(", ", allStrings);

answered Nov 23, 2011 at 13:25

Abbas

14.5k6 gold badges43 silver badges77 bronze badges

Collectives™ on Stack Overflow

Concatenating strings in C# object structure

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related