ArrayList.IndexOf Method (Object, Int32)
Assembly: mscorlib (in mscorlib.dll)
abstract IndexOf : value:Object * startIndex:int -> int override IndexOf : value:Object * startIndex:int -> int
- Type: System.Object
- Type: System.Int32
The zero-based starting index of the search. 0 (zero) is valid in an empty list.
The ArrayList is searched forward starting at startIndex and ending at the last element.
This method performs a linear search; therefore, this method is an O(n) operation, where n is the number of elements from startIndex to the end of the ArrayList.
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.
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.