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[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Searches for the specified Object and returns the zero-based index of the first occurrence within the entire ArrayList.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overridable Function IndexOf ( _
value As Object _
) As Integer
public virtual int IndexOf(
Object value
)
public:
virtual int IndexOf(
Object^ value
)
abstract IndexOf :
value:Object -> int
override IndexOf :
value:Object -> int
public function IndexOf(
value : Object
) : int
Parameters
- value
Type: System. . :: . .Object
The Object to locate in the ArrayList. The value can be nullNothingnullptrunita null reference (Nothing in Visual Basic).
Return Value
Type: System. . :: . .Int32
The zero-based index of the first occurrence of value within the entire ArrayList, if found; otherwise, -1.
Implements
IList. . :: . .IndexOf(Object)
Remarks
The ArrayList is searched forward starting at the first element and ending at the last element.
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.
.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.