Finding count of particular items from a list

Question

I have a List<String> with 1000 names. I want to find out the count of names which is starting with letter "S".

What will be the best option to do it?

Answer 1

If Linq is available

using System.Linq;
list.Where(s=>s!=null && s.StartsWith("S")).Count();

if Linq is not available.

int count=0;
foreach (string s in list) {
  if (s!=null && s.StartsWith("S")) count++;
}

Answer 2

Using linq makes this simple

var count = list.Where(x => x != null && x.StartsWith("S")).Count();

Answer 3

If you have access to LINQ, something like

int count = myList.Count(name => name.StartsWith("S"));

Otherwise, something like

int count = myList.FindAll(name => name.StartsWith("S")).Count;

(Edit: as Bob Vale points out in his answer, if any of your list entries could be null, you need to add a null check e.g. name => name != null && name.StartsWith("S").)

Answer 4

int k = 0;
foreach (string aName in yourStringList)
{
  if (aName.StartsWith("S"))
    {
    k++
    }
}

and k will have the number of names which starts with "S"