IList.IndexOf Method

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:
virtual int IndexOf(
	Object^ value
) sealed = IList::IndexOf

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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