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List<T>.IList.IndexOf Method (Object)

 

Determines the index of a specific item in the IList.

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

int IList.IndexOf(
	object item
)

Parameters

item
Type: System.Object

The object to locate in the IList.

Return Value

Type: System.Int32

The index of item if found in the list; otherwise, –1.

Exception Condition
ArgumentException

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

This method determines equality using the default equality comparer EqualityComparer<T>.Default for T, the type of values in the list.

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

Universal Windows Platform
Available since 4.5
.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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