Expression.Loop Método

Definición

Espacio de nombres:
System.Linq.Expressions
Ensamblados:
System.Core.dll, System.Linq.Expressions.dll
Ensamblados:
netstandard.dll, System.Linq.Expressions.dll
Ensamblado:
System.Linq.Expressions.dll
Ensamblado:
System.Core.dll
Ensamblado:
netstandard.dll

Crea un LoopExpression.

Sobrecargas

Nombre Description
Loop(Expression)

Crea un LoopExpression objeto con el cuerpo especificado.
Loop(Expression, LabelTarget)

Crea un LoopExpression objeto con el cuerpo especificado y el destino de interrupción.
Loop(Expression, LabelTarget, LabelTarget)

Crea un LoopExpression objeto con el cuerpo especificado.

Loop(Expression)

Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs

Crea un LoopExpression objeto con el cuerpo especificado.

public:
 static System::Linq::Expressions::LoopExpression ^ Loop(System::Linq::Expressions::Expression ^ body);
public static System.Linq.Expressions.LoopExpression Loop(System.Linq.Expressions.Expression body);
static member Loop : System.Linq.Expressions.Expression -> System.Linq.Expressions.LoopExpression
Public Shared Function Loop (body As Expression) As LoopExpression

Parámetros

body
Expression

Cuerpo del bucle.

Devoluciones

LoopExpression

Objeto creado LoopExpression.

Se aplica a

Loop(Expression, LabelTarget)

Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs

Crea un LoopExpression objeto con el cuerpo especificado y el destino de interrupción.

public:
 static System::Linq::Expressions::LoopExpression ^ Loop(System::Linq::Expressions::Expression ^ body, System::Linq::Expressions::LabelTarget ^ break);
public static System.Linq.Expressions.LoopExpression Loop(System.Linq.Expressions.Expression body, System.Linq.Expressions.LabelTarget break);
public static System.Linq.Expressions.LoopExpression Loop(System.Linq.Expressions.Expression body, System.Linq.Expressions.LabelTarget? break);
static member Loop : System.Linq.Expressions.Expression * System.Linq.Expressions.LabelTarget -> System.Linq.Expressions.LoopExpression
Public Shared Function Loop (body As Expression, break As LabelTarget) As LoopExpression

Parámetros

body
Expression

Cuerpo del bucle.

break
LabelTarget

Destino de interrupción utilizado por el cuerpo del bucle.

Devoluciones

LoopExpression

Objeto creado LoopExpression.

Ejemplos

En el ejemplo siguiente se muestra cómo crear una expresión de bloque que contenga un LoopExpression objeto .

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

// Creating a parameter expression.
ParameterExpression value = Expression.Parameter(typeof(int), "value");

// Creating an expression to hold a local variable.
ParameterExpression result = Expression.Parameter(typeof(int), "result");

// Creating a label to jump to from a loop.
LabelTarget label = Expression.Label(typeof(int));

// Creating a method body.
BlockExpression block = Expression.Block(
    new[] { result },
    Expression.Assign(result, Expression.Constant(1)),
        Expression.Loop(
           Expression.IfThenElse(
               Expression.GreaterThan(value, Expression.Constant(1)),
               Expression.MultiplyAssign(result,
                   Expression.PostDecrementAssign(value)),
               Expression.Break(label, result)
           ),
       label
    )
);

// Compile and run an expression tree.
int factorial = Expression.Lambda<Func<int, int>>(block, value).Compile()(5);

Console.WriteLine(factorial);

// This code example produces the following output:
//
// 120

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

' Creating a parameter expression.
Dim value As ParameterExpression =
    Expression.Parameter(GetType(Integer), "value")

' Creating an expression to hold a local variable. 
Dim result As ParameterExpression =
    Expression.Parameter(GetType(Integer), "result")

' Creating a label to jump to from a loop.
Dim label As LabelTarget = Expression.Label(GetType(Integer))

' Creating a method body.
Dim block As BlockExpression = Expression.Block(
    New ParameterExpression() {result},
    Expression.Assign(result, Expression.Constant(1)),
    Expression.Loop(
        Expression.IfThenElse(
            Expression.GreaterThan(value, Expression.Constant(1)),
            Expression.MultiplyAssign(result,
                Expression.PostDecrementAssign(value)),
            Expression.Break(label, result)
        ),
        label
    )
)

' Compile an expression tree and return a delegate.
Dim factorial As Integer =
    Expression.Lambda(Of Func(Of Integer, Integer))(block, value).Compile()(5)

Console.WriteLine(factorial)

' This code example produces the following output:
'
' 120

Se aplica a

Loop(Expression, LabelTarget, LabelTarget)

Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs
Source:
LoopExpression.cs

Crea un LoopExpression objeto con el cuerpo especificado.

public:
 static System::Linq::Expressions::LoopExpression ^ Loop(System::Linq::Expressions::Expression ^ body, System::Linq::Expressions::LabelTarget ^ break, System::Linq::Expressions::LabelTarget ^ continue);
public static System.Linq.Expressions.LoopExpression Loop(System.Linq.Expressions.Expression body, System.Linq.Expressions.LabelTarget break, System.Linq.Expressions.LabelTarget continue);
public static System.Linq.Expressions.LoopExpression Loop(System.Linq.Expressions.Expression body, System.Linq.Expressions.LabelTarget? break, System.Linq.Expressions.LabelTarget? continue);
static member Loop : System.Linq.Expressions.Expression * System.Linq.Expressions.LabelTarget * System.Linq.Expressions.LabelTarget -> System.Linq.Expressions.LoopExpression
Public Shared Function Loop (body As Expression, break As LabelTarget, continue As LabelTarget) As LoopExpression

Parámetros

body
Expression

Cuerpo del bucle.

break
LabelTarget

Destino de interrupción utilizado por el cuerpo del bucle.

continue
LabelTarget

Destino de continuación utilizado por el cuerpo del bucle.

Devoluciones

LoopExpression

Objeto creado LoopExpression.

Se aplica a