Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
NotEqual Method (Expression, Expression, Boolean, MethodInfo)

Expression.NotEqual Method (Expression, Expression, Boolean, MethodInfo)

Creates a BinaryExpression that represents an inequality comparison.

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

public static BinaryExpression NotEqual(
	Expression left,
	Expression right,
	bool liftToNull,
	MethodInfo method
)

Parameters

left
Type: System.Linq.Expressions.Expression

An Expression to set the Left property equal to.

right
Type: System.Linq.Expressions.Expression

An Expression to set the Right property equal to.

liftToNull
Type: System.Boolean

true to set IsLiftedToNull to true; false to set IsLiftedToNull to false.

method
Type: System.Reflection.MethodInfo

A MethodInfo to set the Method property equal to.

Return Value

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

ExceptionCondition
ArgumentNullException

left or right is null.

ArgumentException

method is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly two arguments.

InvalidOperationException

method is null and the inequality operator is not defined for left.Type and right.Type.

The resulting BinaryExpression has the Method property set to the implementing method. The Type property is set to the type of the node. If the node is lifted, the IsLifted property is true and the IsLiftedToNull property is equal to liftToNull. Otherwise, they are both false. The Conversion property is null.

The following information describes the implementing method, the node type, and whether a node is lifted.

The following rules determine the implementing method for the operation:

  • If method is not null and it represents a non-void, static (Shared in Visual Basic) method that takes two arguments, it is the implementing method.

  • Otherwise, if the Type property of either left or right represents a user-defined type that overloads the inequality operator, the MethodInfo that represents that method is the implementing method.

  • Otherwise, the implementing method is null.

If the implementing method is not null:

  • If left.Type and right.Type are assignable to the corresponding argument types of the implementing method, the node is not lifted. The type of the node is the return type of the implementing method.

  • If the following two conditions are satisfied, the node is lifted; also, the type of the node is nullable Boolean if liftToNull is true or Boolean if liftToNull is false:

    • left.Type and right.Type are both value types of which at least one is nullable and the corresponding non-nullable types are equal to the corresponding argument types of the implementing method.

    • The return type of the implementing method is Boolean.

If the implementing method is null:

  • If left.Type and right.Type are both non-nullable, the node is not lifted. The type of the node is Boolean.

  • If left.Type and right.Type are both nullable, the node is lifted. The type of the node is nullable Boolean if liftToNull is true or Boolean if liftToNull is false.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
Show:
© 2015 Microsoft