IList<T>.IndexOf(T) Method

Reference

Definition

Namespace:: System.Collections.Generic

Assemblies:: mscorlib.dll, System.Runtime.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

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

public:
 int IndexOf(T item);

public int IndexOf(T item);

abstract member IndexOf : 'T -> int

Public Function IndexOf (item As T) As Integer

Parameters

item: T

The object to locate in the IList<T>.

Returns

Int32

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

Remarks

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

Applies to

Продукт	Версии
.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, 10
.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, 1.5, 1.6, 2.0, 2.1
UWP	10.0

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