Expression.AddAssign Methode

public:
 static System::Linq::Expressions::BinaryExpression ^ AddAssign(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right);

public static System.Linq.Expressions.BinaryExpression AddAssign(System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right);

static member AddAssign : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression -> System.Linq.Expressions.BinaryExpression

Public Shared Function AddAssign (left As Expression, right As Expression) As BinaryExpression

Parameters

Retouren

Een BinaryExpression met de NodeType eigenschap gelijk aan AddAssign en de Left eigenschappen die Right zijn ingesteld op de opgegeven waarden.

Voorbeelden

In het volgende codevoorbeeld ziet u hoe u een expressie maakt die een waarde toevoegt aan een variabele voor een geheel getal en vervolgens het resultaat van de bewerking toewijst aan de variabele.

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

// The Parameter expression is used to create a variable.
ParameterExpression variableExpr = Expression.Variable(typeof(int), "sampleVar");

// The block expression enables you to execute several expressions sequentually.
// In this bloc, the variable is first initialized with 1.
// Then the AddAssign method adds 2 to the variable and assigns the result to the variable.
BlockExpression addAssignExpr = Expression.Block(
    new ParameterExpression[] { variableExpr },
    Expression.Assign(variableExpr, Expression.Constant(1)),
    Expression.AddAssign(
        variableExpr,
        Expression.Constant(2)
    )
);

// Print out the expression from the block expression.
Console.WriteLine("The expressions from the block expression:");
foreach (var expr in addAssignExpr.Expressions)
    Console.WriteLine(expr.ToString());

Console.WriteLine("The result of executing the expression tree:");
// The following statement first creates an expression tree,
// then compiles it, and then executes it.
Console.WriteLine(Expression.Lambda<Func<int>>(addAssignExpr).Compile()());

// This code example produces the following output:
//
// The expressions from the block expression:
// (sampleVar = 1)
// (sampleVar += 2)

// The result of executing the expression tree:
// 3

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

' The parameter expression is used to create a variable.
Dim variableExpr As ParameterExpression = Expression.Variable(GetType(Integer), "sampleVar")

' The block expression enables you to execute several expressions sequentually.
' In this block, the variable is first initialized with 1. 
' Then the AddAssign method adds 2 to the variable and assigns the result to the variable.
Dim addAssignExpr As BlockExpression = Expression.Block(
    New ParameterExpression() {variableExpr},
    Expression.Assign(variableExpr, Expression.Constant(1)),
    Expression.AddAssign(
        variableExpr,
        Expression.Constant(2)
    )
)

' Print the expression from the block expression.
Console.WriteLine("The expressions from the block expression:")
For Each expr As Expression In addAssignExpr.Expressions
    Console.WriteLine(expr.ToString())
Next

Console.WriteLine("The result of executing the expression tree:")
' The following statement first creates an expression tree,
' then compiles it, and then executes it.
Console.WriteLine(Expression.Lambda(Of Func(Of Integer))(addAssignExpr).Compile()())

' This code example produces the following output:
'
' The expressions from the block expression:
' (sampleVar = 1)
' (sampleVar += 2)

' The result of executing the expression tree:
' 3

public:
 static System::Linq::Expressions::BinaryExpression ^ AddAssign(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right, System::Reflection::MethodInfo ^ method);

public static System.Linq.Expressions.BinaryExpression AddAssign(System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right, System.Reflection.MethodInfo method);

static member AddAssign : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression * System.Reflection.MethodInfo -> System.Linq.Expressions.BinaryExpression

Public Shared Function AddAssign (left As Expression, right As Expression, method As MethodInfo) As BinaryExpression

Parameters

Retouren

Een BinaryExpression met de NodeType eigenschap gelijk aan AddAssign en de Left, Righten Method eigenschappen die zijn ingesteld op de opgegeven waarden.

public:
 static System::Linq::Expressions::BinaryExpression ^ AddAssign(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right, System::Reflection::MethodInfo ^ method, System::Linq::Expressions::LambdaExpression ^ conversion);

public static System.Linq.Expressions.BinaryExpression AddAssign(System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right, System.Reflection.MethodInfo method, System.Linq.Expressions.LambdaExpression conversion);

static member AddAssign : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression * System.Reflection.MethodInfo * System.Linq.Expressions.LambdaExpression -> System.Linq.Expressions.BinaryExpression

Public Shared Function AddAssign (left As Expression, right As Expression, method As MethodInfo, conversion As LambdaExpression) As BinaryExpression

Parameters

Retouren

Een BinaryExpression met de NodeType eigenschap die gelijk is aan AddAssign en de Left, Righten MethodConversion eigenschappen die zijn ingesteld op de opgegeven waarden.