Expression.Loop メソッド

定義

LoopExpression を作成します。Creates a LoopExpression.

オーバーロード

Loop(Expression)

指定した本体を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body.

Loop(Expression, LabelTarget)

指定した本体および break の移動先を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body and break target.

Loop(Expression, LabelTarget, LabelTarget)

指定した本体を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body.

Loop(Expression)

指定した本体を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body.

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

パラメーター

body
Expression

ループの本体。The body of the loop.

戻り値

作成された LoopExpressionThe created LoopExpression.

Loop(Expression, LabelTarget)

指定した本体および break の移動先を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body and break target.

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

パラメーター

body
Expression

ループの本体。The body of the loop.

break
LabelTarget

ループの本体によって使用される break の移動先。The break target used by the loop body.

戻り値

作成された LoopExpressionThe created LoopExpression.

次の例では、オブジェクトをLoopExpression含むブロック式を作成する方法を示します。The following example demonstrates how to create a block expression that contains a LoopExpression object.

// 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

Loop(Expression, LabelTarget, LabelTarget)

指定した本体を使用して、LoopExpression を作成します。Creates a LoopExpression with the given body.

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

パラメーター

body
Expression

ループの本体。The body of the loop.

break
LabelTarget

ループの本体によって使用される break の移動先。The break target used by the loop body.

continue
LabelTarget

ループの本体によって使用される continue の移動先。The continue target used by the loop body.

戻り値

作成された LoopExpressionThe created LoopExpression.

適用対象