Expression.NotEqual Method (Expression, Expression, Boolean, MethodInfo)
Creates a BinaryExpression that represents an inequality comparison.
Assembly: System.Core (in System.Core.dll)
static member NotEqual : left:Expression * right:Expression * liftToNull:bool * method:MethodInfo -> BinaryExpression
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.BinaryExpressionA BinaryExpression that has the NodeType property equal to NotEqual and the Left, Right, IsLiftedToNull, and Method properties set to the specified values.
| Exception | Condition |
|---|---|
| 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:
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1