Collection<T>.IList.IndexOf Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Determines the index of a specific item in the IList.
Namespace: System.Collections.ObjectModel
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Private Function IndexOf ( _
value As Object _
) As Integer Implements IList.IndexOf
int IList.IndexOf(
Object value
)
Parameters
- value
Type: System.Object
The Object to locate in the IList.
Return Value
Type: System.Int32
The index of value if found in the list; otherwise, -1.
Implements
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException | value is of a type that is not assignable to the IList. |
Remarks
This method determines equality using the default comparer Comparer<T>.Default. Comparer<T>.Default checks whether type T implements System.IComparable<T> and uses that implementation, if available. If not, Comparer<T>.Default checks whether type T implements System.IComparable. If type T does not implement either interface, this method uses Object.Equals.
This method is an O(n) operation, where n is Count.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.