List<T>.Item[Int32] List<T>.Item[Int32] List<T>.Item[Int32] List<T>.Item[Int32] Property

Definition

Gets or sets the element at the specified index.

public:
 property T default[int] { T get(int index); void set(int index, T value); };
public T this[int index] { get; set; }
member this.Item(int) : 'T with get, set
Default Public Property Item(index As Integer) As T
Parameters
index
Int32 Int32 Int32 Int32

The zero-based index of the element to get or set.

Property Value

The element at the specified index.

Implements
Exceptions

Examples

The example in this section demonstrates the Item[Int32] property (the indexer in C#) and various other properties and methods of the List<T> generic class. After the list has been created and populated using the Add method, an element is retrieved and displayed using the Item[Int32] property. (For an example that uses the Item[Int32] property to set the value of a list element, see AsReadOnly.)

Note

Visual Basic, C#, and C++ all have syntax for accessing the Item[Int32] property without using its name. Instead, the variable containing the List<T> is used as if it were an array.

The C# language uses the keyword to define the indexers instead of implementing the Item[Int32] property. Visual Basic implements Item[Int32] as a default property, which provides the same indexing functionality.

List<string> dinosaurs = new List<string>();

Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);

dinosaurs.Add("Tyrannosaurus");
dinosaurs.Add("Amargasaurus");
dinosaurs.Add("Mamenchisaurus");
dinosaurs.Add("Deinonychus");
dinosaurs.Add("Compsognathus");
Dim dinosaurs As New List(Of String)

Console.WriteLine(vbLf & "Capacity: {0}", dinosaurs.Capacity)

dinosaurs.Add("Tyrannosaurus")
dinosaurs.Add("Amargasaurus")
dinosaurs.Add("Mamenchisaurus")
dinosaurs.Add("Deinonychus")
dinosaurs.Add("Compsognathus")
// Shows accessing the list using the Item property.
Console.WriteLine("\ndinosaurs[3]: {0}", dinosaurs[3]);
' Shows how to access the list using the Item property.
Console.WriteLine(vbLf & "dinosaurs(3): {0}", dinosaurs(3))

Remarks

List<T> accepts null as a valid value for reference types and allows duplicate elements.

This property provides the ability to access a specific element 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.

Applies to

See Also