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Home Forums Explain the ElementAt(), and ElementAtOrDefault() functions in LINQ with C#. – MindStick
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1 Answers

Ashutosh Patel
Ashutosh Patel 12 Feb 2025
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ElementAt() vs ElementAtOrDefault() in LINQ (C#)

ElementAt() and ElementAtOrDefault() are both used to retrieve the element at a specific index in a collection, but they handle out-of-range indexes differently.

ElementAt()

  • Returns the element at the specified index.
  • Throws an exception (ArgumentOutOfRangeException) if the index is out of range.

Example (Retrieving an Element by Index)

using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
   static void Main()
   {
       List<int> numbers = new List<int> { 10, 20, 30, 40, 50 };
       int element = numbers.ElementAt(2); // Gets the 3rd element (index starts at 0)
       Console.WriteLine("Element at index 2: " + element);
       // Output: Element at index 2: 30
       
       // Below code return out of range an error
       List<int> numbers2 = new List<int> { 10, 20, 30 };
       int element2 = numbers2.ElementAt(5); // Index 5 is out of range
       // Throws: ArgumentOutOfRangeException: "Index was out of range"
   }
}

ElementAtOrDefault()

  • Returns the element at the specified index.
  • If the index is out of range, it returns the default value (null for reference types, 0 for numeric types, false for bool).
using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
   static void Main()
   {
       List<int> numbers = new List<int> { 10, 20, 30, 40, 50 };
       int element = numbers.ElementAtOrDefault(2);
       Console.WriteLine("Element at index 2: " + element);
       // Output: Element at index 2: 30
       int outOfRangeElement = numbers.ElementAtOrDefault(5);
       Console.WriteLine("Element at index 5: " + outOfRangeElement);
       // Output: Element at index 5: 0 (default for int)
       
       // for string type
       List<string> names = new List<string> { "Alice", "Bob", "Charlie" };
       string result = names.ElementAtOrDefault(4);
       Console.WriteLine(result == null ? "No element found" : result);
       // Output: No element found (since index 4 is out of range)
   }
}

When to use what?

  • When you are sure the index exists, use ElementAt().
  • When the index is out of range, use ElementAtOrDefault() to prevent exceptions.

Also, Read: What are LINQ Last(), and LastOrDefault() functions?   

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