HashSet<T>.SymmetricExceptWith Method (IEnumerable<T>)

 

Modifies the current HashSet<T> object to contain only elements that are present either in that object or in the specified collection, but not both.

Namespace:   System.Collections.Generic
Assembly:  System.Core (in System.Core.dll)

public void SymmetricExceptWith(
	IEnumerable<T> other
)

Parameters

other
Type: System.Collections.Generic.IEnumerable<T>

The collection to compare to the current HashSet<T> object.

Exception Condition
ArgumentNullException

other is null.

If the other parameter is a HashSet<T> collection with the same equality comparer as the current HashSet<T> object, this method is an O(n) operation. Otherwise, this method is an O(n + m) operation, where n is the number of elements in other and m is Count.

The following example creates two HashSet<T> collections with overlapping sets of data. The set that contains the lower values is then modified, using the SymmetricExceptWith method, to contain only the values that are not present in both sets.

static void Main()
{
    HashSet<int> lowNumbers = new HashSet<int>();
    HashSet<int> highNumbers = new HashSet<int>();

    for (int i = 0; i < 6; i++)
    {
        lowNumbers.Add(i);
    }

    for (int i = 3; i < 10; i++)
    {
        highNumbers.Add(i);
    }

    Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count);
    DisplaySet(lowNumbers);

    Console.Write("highNumbers contains {0} elements: ", highNumbers.Count);
    DisplaySet(highNumbers);

    Console.WriteLine("lowNumbers SymmetricExceptWith highNumbers...");
    lowNumbers.SymmetricExceptWith(highNumbers);

    Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count);
    DisplaySet(lowNumbers);



}
/* This example provides output similar to the following:
 * lowNumbers contains 6 elements: { 0 1 2 3 4 5 }
 * highNumbers contains 7 elements: { 3 4 5 6 7 8 9 }
 * lowNumbers SymmetricExceptWith highNumbers...
 * lowNumbers contains 7 elements: { 0 1 2 8 7 6 9 }
 */

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Return to top
Show: