Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

HashSet<T>::ExceptWith Method (IEnumerable<T>^)

 

Removes all elements in the specified collection from the current HashSet<T> object.

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

public:
virtual void ExceptWith(
	IEnumerable<T>^ other
) sealed

Parameters

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

The collection of items to remove from the HashSet<T> object.

Exception Condition
ArgumentNullException

other is null.

The ExceptWith method is the equivalent of mathematical set subtraction.

This method is an O(n) operation, where n is the number of elements in the other parameter.

The following example creates two HashSet<T> collections with overlapping sets of data. The lower range of values is then removed from the larger set using the ExceptWith method.

static void Main()
{
    HashSet<int>^ lowNumbers = gcnew HashSet<int>();
    HashSet<int>^ highNumbers = gcnew 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("highNumbers ExceptWith lowNumbers...");
    highNumbers->ExceptWith(lowNumbers);

    Console::Write("highNumbers contains {0} elements: ", highNumbers->Count);
    DisplaySet(highNumbers);
}
/* 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 }
 * highNumbers ExceptWith lowNumbers...
 * highNumbers contains 4 elements: { 6 7 8 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:
© 2017 Microsoft