Sets the capacity to the actual number of elements in the List(T), if that number is less than a threshold value.
Assembly: mscorlib (in mscorlib.dll)
This method can be used to minimize a collection's memory overhead if no new elements will be added to the collection. The cost of reallocating and copying a large List(T) can be considerable, however, so the method does nothing if the list is at more than 90 percent of capacity. This avoids incurring a large reallocation cost for a relatively small gain.
The current threshold of 90 percent might change in future releases.
This method is an O(n) operation, where n is Count.
The capacity can also be set using the Capacity property.
The following example demonstrates how to check the capacity and count of a List(T) that contains a simple business object, and illustrates using the method to remove extra capacity.
The following example demonstrates the method. Several properties and methods of the List(T) class are used to add, insert, and remove items from a list of strings. Then the method is used to reduce the capacity to match the count, and the Capacity and Count properties are displayed. If the unused capacity had been less than 10 percent of total capacity, the list would not have been resized. Finally, the contents of the list are cleared.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.