Calculates the difference between two arrays, without filtering duplicate values and using an optional custom comparer.

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• Definition
• Overloads
• Difference(IEnumerable target)
• Difference(IEnumerable target, IEqualityComparer comparer)

Calculates the difference between two arrays, without filtering duplicate values.

public static IEnumerable<T> Difference<T>(this IEnumerable<T> source, IEnumerable<T> target);

T
The type of the elements of the sequences.

source IEnumerable <TSource>
The source sequence.

target IEnumerable <TSource>
The target sequence.

IEnumerable<IEnumerable<TSource>>
A sequence containing all the elements that exist in the source sequence, and not the target sequence, without filtering duplicates.

ArgumentNullException
source is null

The following code example demonstrates how to use Difference(IEnumerable target) to find all elements existing in the source sequence, and not on the target sequence.

int[] array = new int[] { 1, 2, 3, 4, 5 };
int[] array2 = new int[] { 1, 2, 3 };

array.Difference(array2);
//=> [ 4, 5 ]

Calculates the difference between two arrays, without filtering duplicate values, using a custom equality comparer.

public static IEnumerable<T> Difference<T>(this IEnumerable<T> source, IEnumerable<T> target, IEqualityComparer<T> comparer);

T
The type of the elements of the sequences.

source IEnumerable <TSource>
The source sequence.

target IEnumerable <TSource>
The target sequence.

comparerIEqualityComparer<TSource>
The custom equality comparer to use for the comparison.

IEnumerable<IEnumerable<TSource>>
A sequence containing all the elements that exist in the source sequence, and not the target sequence, without filtering duplicates.

ArgumentNullException
source is null

-or-

comparer is null

The following code example demonstrates how to use Difference(IEnumerable target) to find all elements existing in the source sequence, and not on the target sequence, using a custom equality comparer.

string[] array = new string[] { "a", "b", "C" };
string[] array2 = new string[] { "a", "c" };

array.Difference(array2, StringCommparer.OrdinalIgnoreCase);
//=> b