Enumerable.Except Method
public static System.Collections.Generic.IEnumerable<TSource> Except<TSource>(
this System.Collections.Generic.IEnumerable<TSource> first,
System.Collections.Generic.IEnumerable<TSource> second
)
Computes the set difference of two sequences. This method returns elements in the first sequence that do not appear in the second sequence.
The Except method performs an order-preserving, set difference operation on two sequences. It returns only the elements from the first sequence that do not exist in the second sequence. The comparison is done using the default equality comparer for the type of the elements.
Parameters
- System.Collections.Generic.IEnumerable<TSource> first: The sequence to return elements from.
- System.Collections.Generic.IEnumerable<TSource> second: The sequence whose elements will be removed from the first sequence.
Type Parameters
TSource: The type of the elements of the input sequences.
Return Value
An IEnumerable<TSource> that contains the elements from the first sequence that do not appear in the second sequence.
Example
using System;
using System.Collections.Generic;
using System.Linq;
public class Example
{
public static void Main()
{
var numbersA = new List<int> { 1, 2, 3, 4, 5 };
var numbersB = new List<int> { 4, 5, 6, 7, 8 };
var difference = numbersA.Except(numbersB);
Console.WriteLine("Elements in numbersA but not in numbersB:");
foreach (var number in difference)
{
Console.WriteLine(number);
}
// Output:
// 1
// 2
// 3
}
}