ArrayList.LastIndexOf Method (Object, Int32, Int32)
Searches for the specified Object and returns the zero-based index of the last occurrence within the range of elements in the ArrayList that contains the specified number of elements and ends at the specified index.
Assembly: mscorlib (in mscorlib.dll)
abstract LastIndexOf : value:Object * startIndex:int * count:int -> int override LastIndexOf : value:Object * startIndex:int * count:int -> int
The zero-based starting index of the backward search.
The number of elements in the section to search.
The ArrayList is searched backward starting at startIndex and ending at startIndex minus count plus 1, if count is greater than 0.
This method performs a linear search; therefore, this method is an O(n) operation, where n is count.
This method determines equality by calling Object.Equals.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.
The following code example shows how to determine the index of the last occurrence of a specified element. Note that LastIndexOf is a backward search; therefore, count must be less than or equal to startIndex + 1.
Available since 10
Available since 1.1