MethodCallExpression Classe

Definizione

public ref class MethodCallExpression : System::Linq::Expressions::Expression, System::Linq::Expressions::IArgumentProvider

public ref class MethodCallExpression sealed : System::Linq::Expressions::Expression

public ref class MethodCallExpression : System::Linq::Expressions::Expression

public class MethodCallExpression : System.Linq.Expressions.Expression, System.Linq.Expressions.IArgumentProvider

public sealed class MethodCallExpression : System.Linq.Expressions.Expression

public class MethodCallExpression : System.Linq.Expressions.Expression

type MethodCallExpression = class
    inherit Expression
    interface IArgumentProvider

type MethodCallExpression = class
    inherit Expression

Public Class MethodCallExpression
Inherits Expression
Implements IArgumentProvider

Public NotInheritable Class MethodCallExpression
Inherits Expression

Public Class MethodCallExpression
Inherits Expression

Ereditarietà

Object

Expression

MethodCallExpression

Implementazioni

IArgumentProvider

Esempio

Nell'esempio seguente viene creato un MethodCallExpression oggetto che rappresenta l'indicizzazione in una matrice bidimensionale.

string[,] gradeArray =
    { {"chemistry", "history", "mathematics"}, {"78", "61", "82"} };

System.Linq.Expressions.Expression arrayExpression =
    System.Linq.Expressions.Expression.Constant(gradeArray);

// Create a MethodCallExpression that represents indexing
// into the two-dimensional array 'gradeArray' at (0, 2).
// Executing the expression would return "mathematics".
System.Linq.Expressions.MethodCallExpression methodCallExpression =
    System.Linq.Expressions.Expression.ArrayIndex(
        arrayExpression,
        System.Linq.Expressions.Expression.Constant(0),
        System.Linq.Expressions.Expression.Constant(2));

Console.WriteLine(methodCallExpression.ToString());

// This code produces the following output:
//
// value(System.String[,]).Get(0, 2)

Dim gradeArray(,) As String = _
    {{"chemistry", "history", "mathematics"}, {"78", "61", "82"}}

Dim arrayExpression As System.Linq.Expressions.Expression = _
    System.Linq.Expressions.Expression.Constant(gradeArray)

' Create a MethodCallExpression that represents indexing
' into the two-dimensional array 'gradeArray' at (0, 2).
' Executing the expression would return "mathematics".
Dim methodCallExpression As System.Linq.Expressions.MethodCallExpression = _
    System.Linq.Expressions.Expression.ArrayIndex( _
        arrayExpression, _
        System.Linq.Expressions.Expression.Constant(0), _
        System.Linq.Expressions.Expression.Constant(2))

Console.WriteLine(methodCallExpression.ToString())

' This code produces the following output:
'
' value(System.String[,]).Get(0, 2)

Commenti

Usare il Callmetodo , ArrayIndexo ArrayIndex factory per creare un oggetto MethodCallExpression.

Il valore della NodeType proprietà di un MethodCallExpression oggetto è Call.