Check if a single value in List in C#

Question

How to check a single value is in a List. My List contains few random numbers: 13, 55, 34, 122, 322, 2132, 4345, 3000.

I want to have a bool check the list if it contains int 4 or any other number. List can have large numbers in three or four figures in the list.

It would be nice to guide me to design helper in webmatrix to provide bool results for this value check.

Have you tried anything? Have you heard of the instance method `List.Contains()`? — e_ne, Jan 07 '13 at 04:38
Hi, and welcome to SO. You'll have more success getting an answer if you demonstrate some specific code, particularly something you've already tried. — DWright, Jan 07 '13 at 05:00

score 1 · Answer 1 · answered Jan 07 '13 at 04:41

1

Try this,intVariable is your variable to search

bool isInList = intList.IndexOf(intVariable) != -1;

answered Jan 07 '13 at 04:41

sajanyamaha

It didn't work for me or I was not implementing correctly. Thanks any way. – Nasir Raza Jan 09 '13 at 14:01

score 0 · Answer 2 · answered Jan 07 '13 at 04:45

0

You can't get away without iteration (loop). Use Enumerable.Any(that uses iterator internally) for simplicity.

var ints = new int[] {1,2,3,4,5};
var any5 = ints.Any( i=> i== 5);

answered Jan 07 '13 at 04:45

Tilak

Can you show what you have tried? I have checked the query before posting here. – Tilak Jan 09 '13 at 14:02

score 0 · Answer 3 · answered Jan 07 '13 at 12:03

0

if the list is not that big why dont you loop inside the list

foreach(int a in MyList)
{
   if(a == "that_value")
   {
     break;
   }
}

answered Jan 07 '13 at 12:03

befree2j

I am already doing through loop; some what similar to this. Thanks. – Nasir Raza Jan 09 '13 at 14:00
I think there should be some other method to call this procedure through web helper in web matrix rather than putting this kind of loop over different places. – Nasir Raza Jan 09 '13 at 14:08

3 Answers3