Mega Code Archive
0401 FirstOrDefault
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The following demonstrates First versus FirstOrDefault:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int[] numbers = { 1, 2, 3, 4, 5 };
int firstBigError = numbers.First(n => n > 10); // Exception
int firstBigNumber = numbers.FirstOrDefault(n => n > 10); // 0
Console.WriteLine(firstBigError);
Console.WriteLine(firstBigNumber);
}
}
The output:
Unhandled Exception: System.InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate)
at Program.Main() in c:\g\Program.cs:line 11
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