Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

ReadOnlyCollection(T).IList.IndexOf Method

Determines the index of a specific item in the IList.

Namespace:  System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)

private abstract IndexOf : 
        value:Object -> int  
private override IndexOf : 
        value:Object -> int

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

IList.IndexOf(Object)

ExceptionCondition
ArgumentException

value is not of the type specified for the generic type parameter T.

This method determines equality using the default comparer EqualityComparer(T).Default.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection(T) instance is cast to an IList interface.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Show:
© 2015 Microsoft