Expression.ArrayIndex Method (Expression, Expression)

Creates a BinaryExpression that represents applying an array index operator to an array of rank one.

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static BinaryExpression ArrayIndex(
	Expression array,
	Expression index


Type: System.Linq.Expressions.Expression

A Expression to set the Left property equal to.

Type: System.Linq.Expressions.Expression

A Expression to set the Right property equal to.

Return Value

Type: System.Linq.Expressions.BinaryExpression
A BinaryExpression that has the NodeType property equal to ArrayIndex and the Left and Right properties set to the specified values.


array or index is null.


array.Type does not represent an array type.


array.Type represents an array type whose rank is not 1.


index.Type does not represent the Int32 type.

index must represent an index of type Int32.

The Method property of the resulting BinaryExpression is null, and both IsLifted and IsLiftedToNull are set to false. The Type property is equal to the element type of array.Type. The Conversion property is null.

.NET Framework

Supported in: 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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