| Input: | IEnumerable<TSource> |
| Optional expression: | TSource => bool |
Count simply enumerates over a sequence, returning the number of items:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int fullCount = new int[] { 5, 6, 7 }.Count(); // 3
Console.WriteLine(fullCount);
}
}
The output:
3
You can optionally supply a predicate:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int digitCount = "java2s.com".Count(c => char.IsDigit(c)); // 3
Console.WriteLine(digitCount);
}
}
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