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


Determines the index of a specific item in the IList<T>.

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

int IndexOf(
	T item


Type: T

The object to locate in the IList<T>.

Return Value

Type: System.Int32

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

If an object occurs multiple times in the list, the IndexOf method always returns the first instance found.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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