List<T>.IList.IndexOf(Object) Method
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Determines the index of a specific item in the IList.
virtual int System.Collections.IList.IndexOf(System::Object ^ item) = System::Collections::IList::IndexOf;
int IList.IndexOf(object item);
abstract member System.Collections.IList.IndexOf : obj -> int
override this.System.Collections.IList.IndexOf : obj -> int
Function IndexOf (item As Object) As Integer Implements IList.IndexOf
The index of item
if found in the list; otherwise, -1.
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.
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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