Iterating through a list with out using ForEach loop

Question

I have a list of list of strings:

var list = new List<string> {"apples","peaches", "mango"};

Is there a way to iterate through the list and display the items in a console window without using foreach loop may be by using lambdas and delegates.

I would like to the output to be like below each in a new line:

The folowing fruits are available:
apples
peaches
mango

Heres an hint : retrieve the length and iterate from 0 to length -1 — Hugo Dozois, Mar 11 '13 at 23:09
There are dozens of ways to do this. What are the requirements and why does `foreach` not satisfy them? — Oren Melzer, Mar 11 '13 at 23:10
duplicate of http://stackoverflow.com/questions/559415/concat-all-strings-inside-a-liststring-using-linq — hatchet - done with SOverflow, Mar 11 '13 at 23:11

score 21 · Accepted Answer · answered Mar 11 '13 at 23:12

21

You can use String.Join to concatenate all lines:

string lines = string.Join(Environment.NewLine, list);
Console.Write(lines);

answered Mar 11 '13 at 23:12

Tim Schmelter

450,073
74
686
939

score 11 · Answer 2 · answered Mar 11 '13 at 23:10

11

By far the most obvious is the good old-fashioned for loop:

for (var i = 0; i < list.Count; i++)
{
    System.Console.WriteLine("{0}", list[i]);
}

answered Mar 11 '13 at 23:10

Philip Kendall

4,304
1
23
42

Ok, For me this is the clearest version and I like it the most. Thanks – Combine Jul 05 '15 at 07:57

score 3 · Answer 3 · answered Mar 11 '13 at 23:11

3

for (int i = 0; i < list.Count; i++)
    {
    Console.WriteLine(list[i])
    }

answered Mar 11 '13 at 23:11

Unicorno Marley

1,744
1
14
17

score 3 · Answer 4 · answered Mar 11 '13 at 23:12

3

I love this particular aspect of linq

list.ForEach(Console.WriteLine);

It's not using a ForEach loop per se as it uses the ForEach actor. But hey it's still an iteration.

answered Mar 11 '13 at 23:12

Preet Sangha

64,563
18
145
216

1

Note that `List.ForEach` is not a LINQ method, but just a plain old regular `List` method; LINQ methods are never purely called for their side effects as `List.ForEach` is. – Philip Kendall Mar 11 '13 at 23:25
Yeah technically I agree but these features are usually lumped together with linq :-) – Preet Sangha Mar 12 '13 at 01:15

score 1 · Answer 5 · answered Mar 11 '13 at 23:13

1

You can use List<T>.ForEach method, which actually is not part of LINQ, but looks like it was:

list.ForEach(i => Console.WriteLine(i));

answered Mar 11 '13 at 23:13

MarcinJuraszek

124,003
15
196
263

score 1 · Answer 6 · edited Mar 11 '13 at 23:19

1

Well, you could try the following:

Debug.WriteLine("The folowing fruits are available:");
list.ForEach(f => Debug.WriteLine(f));

It's the very equivalent of a foreach loop, but not using the foreach keyword,

That being said, I don't know why you'd want to avoid a foreach loop when iterating over a list of objects.

edited Mar 11 '13 at 23:19

Philip Kendall

4,304
1
23
42

answered Mar 11 '13 at 23:13

joce

9,624
19
56
74

score 1 · Answer 7 · answered Sep 22 '16 at 10:07

1

There are three ways to iterate a List:

//1 METHOD
foreach (var item in myList)
{
    Console.WriteLine("Id is {0}, and description is {1}", item.id, item.description);
}

//2 METHOD   
for (int i = 0; i<myList.Count; i++)
{ 
    Console.WriteLine("Id is {0}, and description is {1}", myList[i].id, myMoney[i].description);
}

//3 METHOD lamda style
myList.ForEach(item => Console.WriteLine("id is {0}, and description is {1}", item.id, item.description));

answered Sep 22 '16 at 10:07

daniele3004

13,072
12
67
75

The brevity of method 3 is popular with some devs but it has the disadvantage that you cannot "break" -out of it, if processing can be curtailed before all items have been accessed. – Zeek2 Jun 07 '18 at 13:58

Iterating through a list with out using ForEach loop

7 Answers7