InvocationExpression Class (System.Linq.Expressions)

.NET Framework Class Library

InvocationExpression Class

Represents an expression that applies a delegate or lambda expression to a list of argument expressions.

Namespace: System.Linq.Expressions
Assembly: System.Core (in System.Core.dll)

Syntax

Visual Basic (Declaration)

Public NotInheritable Class InvocationExpression _
    Inherits Expression

Visual Basic (Usage)

Dim instance As InvocationExpression

public sealed class InvocationExpression : Expression

Visual C++

public ref class InvocationExpression sealed : public Expression

JScript

public final class InvocationExpression extends Expression

Remarks

Use the Invoke factory methods to create an InvocationExpression.

The NodeType of an InvocationExpression is Invoke.

Examples

The following example creates an InvocationExpression that represents invoking a lambda expression with specified arguments.

Visual Basic

Dim largeSumTest As System.Linq.Expressions.Expression(Of System.Func(Of Integer, Integer, Boolean)) = _
    Function(num1, num2) (num1 + num2) > 1000

' Create an InvocationExpression that represents applying
' the arguments '539' and '281' to the lambda expression 'largeSumTest'.
Dim invocationExpression As System.Linq.Expressions.InvocationExpression = _
    System.Linq.Expressions.Expression.Invoke( _
        largeSumTest, _
        System.Linq.Expressions.Expression.Constant(539), _
        System.Linq.Expressions.Expression.Constant(281))

Console.WriteLine(invocationExpression.ToString())

' This code produces the following output:
'
' Invoke((num1, num2) => ((num1 + num2) > 1000),539,281)

System.Linq.Expressions.Expression<Func<int, int, bool>> largeSumTest =
    (num1, num2) => (num1 + num2) > 1000;

// Create an InvocationExpression that represents applying
// the arguments '539' and '281' to the lambda expression 'largeSumTest'.
System.Linq.Expressions.InvocationExpression invocationExpression =
    System.Linq.Expressions.Expression.Invoke(
        largeSumTest,
        System.Linq.Expressions.Expression.Constant(539),
        System.Linq.Expressions.Expression.Constant(281));

Console.WriteLine(invocationExpression.ToString());

// This code produces the following output:
//
// Invoke((num1, num2) => ((num1 + num2) > 1000),539,281)

Inheritance Hierarchy

System..::.Object
System.Linq.Expressions..::.Expression
System.Linq.Expressions..::.InvocationExpression

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5

Reference

InvocationExpression Members

System.Linq.Expressions Namespace