Expression.Increment 方法

定义

命名空间:

System.Linq.Expressions

程序集:

System.Linq.Expressions.dll

创建一个 UnaryExpression，它表示按 1 递增表达式值。

重载

Increment(Expression, MethodInfo)	创建一个 UnaryExpression，它表示按 1 递增表达式值。
Increment(Expression)	创建一个 UnaryExpression，它表示按 1 递增表达式值。

Increment(Expression, MethodInfo)

Source:

UnaryExpression.cs

创建一个 UnaryExpression，它表示按 1 递增表达式值。

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

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

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

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

参数

expression

Expression

要递增的 Expression。

method

MethodInfo

表示实现方法的 MethodInfo。

返回

UnaryExpression

一个表示已递增的表达式的 UnaryExpression。

注解

此表达式是功能性的，不会更改传递给它的 对象的值。

Increment(Expression)

Source:

UnaryExpression.cs

创建一个 UnaryExpression，它表示按 1 递增表达式值。

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

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

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

Public Shared Function Increment (expression As Expression) As UnaryExpression

参数

expression

Expression

要递增的 Expression。

返回

UnaryExpression

一个表示已递增的表达式的 UnaryExpression。

示例

下面的代码示例演示如何创建表示递增操作的表达式。

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

// This expression represents an increment operation.
double num = 5.5;
Expression incrementExpr = Expression.Increment(
                            Expression.Constant(num)
                        );

// Print out the expression.
Console.WriteLine(incrementExpr.ToString());

// The following statement first creates an expression tree,
// then compiles it, and then executes it.
Console.WriteLine(Expression.Lambda<Func<double>>(incrementExpr).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:
//
// Increment(5.5)
// 6.5
// object: 5.5

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

Dim num As Double = 5.5
' This expression represents an increment operation. 
Dim incrementExpr As Expression = Expression.Increment(
                            Expression.Constant(num)
                        )

' Print the expression.
Console.WriteLine(incrementExpr.ToString())

' The following statement first creates an expression tree,
' then compiles it, and then executes it.
Console.WriteLine(Expression.Lambda(Of Func(Of Double))(incrementExpr).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:
'
' Increment(5.5)
' 6.5
' object: 5.5

注解

此表达式是功能性的，不会更改传递给它的 对象的值。