Expression.GreaterThan Method (Expression, Expression)
Creates a BinaryExpression that represents a "greater than" numeric comparison.
Assemblies: System.Core (in System.Core.dll)
System.Linq.Expressions (in System.Linq.Expressions.dll)
'Declaration Public Shared Function GreaterThan ( _ left As Expression, _ right As Expression _ ) As BinaryExpression
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. Otherwise, it is false. The IsLiftedToNull property is always false. The Conversion property is Nothing.
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 the implementing method is not Nothing:
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 and the type of the node is Boolean:
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 Nothing:
The following code example shows how to create an expression that compares two integers.
' Add the following directive to your file: ' Imports System.Linq.Expressions ' This expression compares the values of its two arguments. ' Both arguments must be of the same type. Dim greaterThanExpr As Expression = Expression.GreaterThan( Expression.Constant(42), Expression.Constant(45) ) ' Print the expression. Console.WriteLine(greaterThanExpr.ToString()) ' The following statement first creates an expression tree, ' then compiles it, and then executes it. Console.WriteLine( Expression.Lambda(Of Func(Of Boolean))(greaterThanExpr).Compile()()) ' This code example produces the following output: ' ' (42 > 45) ' False