UnaryExpression Class (System.Linq.Expressions)

UnaryExpression Class
This page is specific to:.NET Framework Version:3.5Silverlight 3 4.0

.NET Framework Class Library

UnaryExpression Class

Represents an expression that has a unary operator.

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

Syntax

C++

JScript

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'Usage

Dim instance As UnaryExpression

'Declaration

Public NotInheritable Class UnaryExpression _
    Inherits Expression

Remarks

The following table summarizes the factory methods that can be used to create a UnaryExpression that has a specific node type.

NodeType	Factory Method
ArrayLength	ArrayLength
Convert	Convert
ConvertChecked	ConvertChecked
Negate	Negate
NegateChecked	NegateChecked
Not	Not
Quote	Quote
TypeAs	TypeAs
UnaryPlus	UnaryPlus

In addition, the MakeUnary methods can also be used to create a UnaryExpression. These factory methods can be used to create a UnaryExpression of any node type that represents a unary operation. The parameter of these methods that is of type NodeType specifies the desired node type.

Examples

The following example creates a UnaryExpression object that represents the reference conversion of a non-nullable integer expression to the nullable integer type.

C++

JScript

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' Create a UnaryExpression that represents a reference
' conversion of an Integer to an Integer? (a nullable Integer).
Dim typeAsExpression As System.Linq.Expressions.UnaryExpression = _
    System.Linq.Expressions.Expression.TypeAs( _
        System.Linq.Expressions.Expression.Constant(34, Type.GetType("System.Int32")), _
        Type.GetType("System.Nullable`1[System.Int32]"))

Console.WriteLine(typeAsExpression.ToString())

' This code produces the following output:
'
' (34 As Nullable`1)

Inheritance Hierarchy

System..::.Object
System.Linq.Expressions..::.Expression
System.Linq.Expressions..::.UnaryExpression

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

Version Information

.NET Framework

Supported in: 3.5

Reference

UnaryExpression Members

System.Linq.Expressions Namespace