Gets the number of items currently contained by the collection.
Assembly: PresentationFramework (in PresentationFramework.dll)
The Capacity property represents the number of pre-allocated slots for storing items in this collection, whereas the property represents the actual number of items currently in the collection. The value of Capacity is always at least as large as the value of .
When newly added collection items cause the collection count to exceed the collection capacity, the capacity is automatically increased to accommodate the newly added collection items. Increasing the collection capacity involves allocating additional collection slots, which incurs both performance and memory overhead. Use the Capacity property to optimize the collection capacity in cases where the total or maximum number of collection items is known in advance. Use the TrimToSize method to cause the collection capacity to equalized with the current collection count.
This example demonstrates some of the more common operations that can be performed on a table's columns through the Columns property.
The following example inserts a new TableColumn. The new column is inserted at index position 0, making it the new first column in the table.
The TableColumnCollection collection uses standard zero-based indexing.
The following example accesses some arbitrary properties on columns in the TableColumnCollection collection, referring to particular columns by index.
The following example gets the number of columns currently hosted by the table.
The following example removes a particular column by reference.
The following example removes a particular column by index.
The following example removes all columns from the table's columns collection.
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.