Expression.Decrement Método

Definición

Espacio de nombres:

System.Linq.Expressions

Ensamblado:

System.Linq.Expressions.dll

Crea un objeto UnaryExpression que representa la disminución de la expresión en 1.

Sobrecargas

Decrement(Expression)	Crea un objeto UnaryExpression que representa la disminución de la expresión en 1.
Decrement(Expression, MethodInfo)	Crea un objeto UnaryExpression que representa la disminución de la expresión en 1.

Decrement(Expression)

Source:

UnaryExpression.cs

Crea un objeto UnaryExpression que representa la disminución de la expresión en 1.

public:
 static System::Linq::Expressions::UnaryExpression ^ Decrement(System::Linq::Expressions::Expression ^ expression);

public static System.Linq.Expressions.UnaryExpression Decrement (System.Linq.Expressions.Expression expression);

static member Decrement : System.Linq.Expressions.Expression -> System.Linq.Expressions.UnaryExpression

Public Shared Function Decrement (expression As Expression) As UnaryExpression

Parámetros

expression

Expression

Expression que se va a disminuir.

Devoluciones

UnaryExpression

UnaryExpression que representa la expresión disminuida.

Ejemplos

En el ejemplo de código siguiente se muestra cómo crear una expresión que resta 1 de un valor determinado.

// 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.
Console.WriteLine(decrementExpr.ToString());

// The following statement first creates an expression tree,
// then compiles it, and then executes it.
Console.WriteLine(
    Expression.Lambda<Func<double>>(decrementExpr).Compile()());

// The value of the variable did not change,
// because the expression is functional.
Console.WriteLine("object: " + num);

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

' 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.
Console.WriteLine(decrementExpr.ToString())

' The following statement first creates an expression tree,
' then compiles it, and then executes it.
Console.WriteLine(
    Expression.Lambda(Of Func(Of Double))(decrementExpr).Compile()())

' The value of the variable did not change,
' because the expression is functional.
Console.WriteLine("object: " & num)

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

Comentarios

Esta expresión es funcional y no cambia el valor del objeto que se le pasa.

Decrement(Expression, MethodInfo)

Source:

UnaryExpression.cs

Crea un objeto UnaryExpression que representa la disminución de la expresión en 1.

public:
 static System::Linq::Expressions::UnaryExpression ^ Decrement(System::Linq::Expressions::Expression ^ expression, System::Reflection::MethodInfo ^ method);

public static System.Linq.Expressions.UnaryExpression Decrement (System.Linq.Expressions.Expression expression, System.Reflection.MethodInfo? method);

static member Decrement : System.Linq.Expressions.Expression * System.Reflection.MethodInfo -> System.Linq.Expressions.UnaryExpression

Public Shared Function Decrement (expression As Expression, method As MethodInfo) As UnaryExpression

Parámetros

expression

Expression

Expression que se va a disminuir.

method

MethodInfo

MethodInfo que representa el método de implementación.

Devoluciones

UnaryExpression

UnaryExpression que representa la expresión disminuida.

Comentarios

Esta expresión es funcional y no cambia el valor del objeto que se le pasa.