AF SDK Reference

AFCollection(T).Item Property (Int32)

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AFCollection(T).Item Property (Int32)

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Last UpdatedNov 18, 2025
2 minute read

Returns the item located at the passed in index.

Gets or sets the item at the specified index.

Namespace: OSIsoft.AF
Assembly: OSIsoft.AFSDK (in OSIsoft.AFSDK.dll) Version: 3.1.1.1182

Syntax

public T this[
	int index
] { get; set; }

Public Default Property Item ( 
	index As Integer
) As T
	Get
	Set

Dim instance As AFCollection
Dim index As Integer
Dim value As T

value = instance(index)

instance(index) = value

public:
virtual property T default[int index] {
	T get (int index) sealed;
	void set (int index, T value) sealed;
}

abstract Item : 'T with get, set
override Item : 'T with get, set

Parameters

index: Type: SystemInt32
The zero-based index of the item to get or set.

Property Value

Type: T
The item at the specified index.

Implements

IListTItemInt32

Exceptions

Exception	Condition
ArgumentOutOfRangeException	index is less than zero or is equal to or greater than Count.
NotSupportedException	The collection is read-only when attempting to set the item.
ArgumentNullException	The value was when attempting to set the item.

Remarks

The collection does not accept as a valid value and does allow duplicate items.

This property provides the ability to access a specific item in the collection by using the following syntax: myCollection[index].

Retrieving the value of this property is an O(1) operation; setting the property is also an O(1) operation.

AF SDK Reference