HashSet<T>::TrimExcess Method ()
Sets the capacity of a HashSet<T> object to the actual number of elements it contains, rounded up to a nearby, implementation-specific value.
Assembly: System.Core (in System.Core.dll)
You can use the TrimExcess method to minimize a HashSet<T> object's memory overhead once it is known that no new elements will be added. To completely clear a HashSet<T> object and release all memory referenced by it, call this method after calling the Clear method.
This method is an O(n) operation, where n is Count.
The following example creates and populates a HashSet<T> collection, and then clears the collection and releases the memory referenced by it.
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