Expression.Decrement Method (Expression)

Parameters

• expression
  Type: System.Linq.Expressions.Expression
  An Expression to decrement.

Return Value

Type: System.Linq.Expressions.UnaryExpression
A UnaryExpression that represents the decremented expression.

' Add the following directive to your file:
' Imports System.Linq.Expressions   

Dim num As Double = 5.5

' This expression represents a decrement operation 
' that subtracts 1 from a value. 
Dim decrementExpr As Expression = Expression.Decrement(
                            Expression.Constant(num)
                        )

' Print the expression.
outputBlock.Text &= decrementExpr.ToString() & vbCrLf

' The following statement first creates an expression tree,
' then compiles it, and then executes it.
outputBlock.Text &=
    Expression.Lambda(Of Func(Of Double))(decrementExpr).Compile()() & vbCrLf

' The value of the variable did not change,
' because the expression is functional.
outputBlock.Text &= "object: " & num & vbCrLf

' This code example produces the following output:
'
' Decrement(5.5)
' 4.5
' object: 5.5

// Add the following directive to your file:
// using System.Linq.Expressions;  

double num = 5.5;

// This expression represents a decrement operation 
// that subtracts 1 from a value. 
Expression decrementExpr = Expression.Decrement(
                            Expression.Constant(num)
                        );

// Print expression.
outputBlock.Text += decrementExpr.ToString() + "\n";

// The following statement first creates an expression tree,
// then compiles it, and then executes it.
outputBlock.Text +=
    Expression.Lambda<Func<double>>(decrementExpr).Compile()() + "\n";

// The value of the variable did not change,
// because the expression is functional.
outputBlock.Text += "object: " + num + "\n";

// This code example produces the following output:
//
// Decrement(5.5)
// 4.5
// object: 5.5