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How do I change the text on an object property of a generic list of objects?

Posted on 2009-04-10
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Last Modified: 2012-05-06
If Ive got a generic list of objects and I want to change the text on one of those objects properties, how do I do it?
 
Gary Davis
class Prod
        {
            public Prod()
            {
            }
 
            public int Id { get; set; }
            public string Title { get; set; }
        }
 
            var prd = new List<Prod>();
            var prd1 = new Prod {Id = 1, Title = "MY TITLE"};
            var prd2 = new Prod { Id = 2, Title = "SOME THING" };
            prd.Add(prd1);
            prd.Add(prd2);
 
  //this doesn't work - i assume because the lambda is trying to change the object, not the property
 
            prd.ForEach(x => x.Title.ToLower()); 
 
            foreach (var p in prd)
                Console.WriteLine(string.Format("id={0} title={1}", p.Id, p.Title));

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Question by:Gary Davis
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6 Comments
 
LVL 22

Expert Comment

by:p_davis
ID: 24117225
try

 prd.ForEach(delegate(Prod p1)
            {
                p1.Title = p1.Title.ToLower();
               
            });
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LVL 22

Accepted Solution

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p_davis earned 500 total points
ID: 24117233
or if you wish to stick to the lambda

 prd.ForEach(x =>x.Title = x.Title.ToLower());
0
 
LVL 22

Expert Comment

by:p_davis
ID: 24117241
basically it wasn't modifying it because ToLower() returns a string it doesn't modify the string that it is referencing.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 24117275
Change line 10 to:
prd.ForEach(x => x.Title = x.Title.ToLower()); 

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Expert Comment

by:käµfm³d 👽
ID: 24117282
Curses! Foiled by p_davis again  :)

Couldn't get my test app built fast enough, lol!
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LVL 22

Expert Comment

by:p_davis
ID: 24117292
happens to me all the time.
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