Expression.LessThanOrEqual Method (Expression, Expression, Boolean, MethodInfo)
Creates a BinaryExpression that represents a "less than or equal" numeric comparison.
Assembly: System.Core (in System.Core.dll)
public static BinaryExpression LessThanOrEqual( Expression left, Expression right, bool liftToNull, MethodInfo method )
- Type: System.Boolean
left or right is null.
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.
method is null and the "less than or equal" 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 "less than or equal" operator, the MethodInfo that represents that method is the implementing method.
Otherwise, if left.Type and right.Type are numeric types, 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.
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
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1