IndexOf Method (Object, Int32)
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Searches for the specified Object and returns the zero-based index of the first occurrence within the range of elements in the ArrayList that extends from the specified index to the last element.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overridable Function IndexOf ( _
value As Object, _
startIndex As Integer _
) As Integer
public virtual int IndexOf(
Object value,
int startIndex
)
public:
virtual int IndexOf(
Object^ value,
int startIndex
)
abstract IndexOf :
value:Object *
startIndex:int -> int
override IndexOf :
value:Object *
startIndex:int -> int
public function IndexOf(
value : Object,
startIndex : int
) : int
Parameters
- value
Type: System. . :: . .Object
The Object to locate in the ArrayList. The value can be nullNothingnullptrunita null reference (Nothing in Visual Basic).
- startIndex
Type: System. . :: . .Int32
The zero-based starting index of the search. 0 (zero) is valid in an empty list.
Return Value
Type: System. . :: . .Int32
The zero-based index of the first occurrence of value within the range of elements in the ArrayList that extends from startIndex to the last element, if found; otherwise, -1.
Remarks
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.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see dd66cd4c-b087-415f-9c3e-94e3a1835f74.