HashSet<T>.Clear Method ()

 

Removes all elements from a HashSet<T> object.

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

public void Clear()

Count is set to zero and references to other objects from elements of the collection are also released. The capacity remains unchanged until a call to TrimExcess is made.

This method is an O(n) operation, where n is Count.

The following example creates and populates a HashSet<T> collection, then clears it and releases the memory referenced by the collection.

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

    for (int i = 0; i < 10; i++)
    {
        Numbers.Add(i);
    }

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

    Numbers.Clear();
    Numbers.TrimExcess();

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

}
/* This example produces output similar to the following:
 * Numbers contains 10 elements: { 0 1 2 3 4 5 6 7 8 9 }
 * Numbers contains 0 elements: { }
 */

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
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