Collection<'T>.IList.IndexOf Method (Object)

 

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.

Exception Condition
ArgumentException

value is of a type that is not assignable to the IList.

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.

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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