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HashSet<T>.Clear Method

.NET Framework 4

Other Versions

Removes all elements from a HashSet<T> object.

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

Syntax

C++

Copy

public void Clear()

Implements

ICollection<T>.Clear()

Remarks

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.

Examples

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

Copy


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: { }
 */

Version Information

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

HashSet<T> Class

System.Collections.Generic Namespace

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