How to Convert a list of objects to a string list

Question

I have a list of Person objects

class Person
{
    string FirstName{get;set;}
    int Age {get;set;}
}

Now in this Person objects list

Person1 has FirstName="Alan", Age=20

Person 2 has FirstName="Josephine", Age=21

I need to get a new List, where each list item has the first name concatenated with the age

List I need:

Alan:20

Josephine:21

...so on

I have this so far...

var PersonConcatenatedList= from p in PersonList
                            select new {firstName= p.FirstName, Age=p.Age};

err...but now how to ouput the desired list format ? :(

Any help will be greatly appreciated. thanks

Selman Genç · Accepted Answer · 2014-05-23 14:54:51Z

3

Use string.Join:

var PersonConcatenatedList = PersonList
                            .Select(x => string.Join(":", x.FirstName, x.Age));

Since you need a list of strings you shouldn't create ananymous types.Simple string concatanation would also work:

PersonList.Select(x => x.FirstName + ":" + x.Age));

If you want output as a single string, then use string.Join via Environment.NewLine and concatanate the results with new line character:

var output = string.Join(Environment.NewLine, PersonConcatenatedList);

edited May 23, 2014 at 14:54

answered May 23, 2014 at 14:48

Selman Genç

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1 Comment

Cam Bruce Over a year ago

The result will be a collection, so you can format the new line after each iteration in the UI.

Andy · Accepted Answer · 2014-05-23 14:54:52Z

1

String.Join() is one way to go. But for good programming I suggest implementing the .ToString() method.

class Person
{
    string FirstName { get; set; }
    int Age { get; set; }

    public override string ToString()
    {
        return this.FirstName + ":" + this.Age;
    }
}

Then simply use the following:

var result = personList.Select(person => person.ToString());

answered May 23, 2014 at 14:54

Andy

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