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
The Object to locate in the ArrayList. The value can be a null reference (Nothing in Visual Basic).
- 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 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.