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IReflect.InvokeMember Method

Invokes a specified member.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

Object InvokeMember (
	string name,
	BindingFlags invokeAttr,
	Binder binder,
	Object target,
	Object[] args,
	ParameterModifier[] modifiers,
	CultureInfo culture,
	string[] namedParameters
)
Object InvokeMember (
	String name, 
	BindingFlags invokeAttr, 
	Binder binder, 
	Object target, 
	Object[] args, 
	ParameterModifier[] modifiers, 
	CultureInfo culture, 
	String[] namedParameters
)
function InvokeMember (
	name : String, 
	invokeAttr : BindingFlags, 
	binder : Binder, 
	target : Object, 
	args : Object[], 
	modifiers : ParameterModifier[], 
	culture : CultureInfo, 
	namedParameters : String[]
) : Object

Parameters

name

The name of the member to find.

invokeAttr

One of the BindingFlags invocation attributes. The invokeAttr parameter may be a constructor, method, property, or field. A suitable invocation attribute must be specified. Invoke the default member of a class by passing the empty string ("") as the name of the member.

binder

One of the BindingFlags bit flags. Implements Binder, containing properties related to this method.

target

The object on which to invoke the specified member. This parameter is ignored for static members.

args

An array of objects that contains the number, order, and type of the parameters of the member to be invoked. This is an empty array if there are no parameters.

modifiers

An array of ParameterModifier objects. This array has the same length as the args parameter, representing the invoked member's argument attributes in the metadata. A parameter can have the following attributes: pdIn, pdOut, pdRetval, pdOptional, and pdHasDefault. These represent [In], [Out], [retval], [optional], and a default parameter, respectively. These attributes are used by various interoperability services.

culture

An instance of CultureInfo used to govern the coercion of types. For example, culture converts a String that represents 1000 to a Double value, since 1000 is represented differently by different cultures. If this parameter is a null reference (Nothing in Visual Basic), the CultureInfo for the current thread is used.

namedParameters

A String array of parameters.

Return Value

The specified member.

Exception typeCondition

ArgumentException

invokeAttr is BindingFlags.CreateInstance and another bit flag is also set.

ArgumentException

invokeAttr is not BindingFlags.CreateInstance and name is a null reference (Nothing in Visual Basic).

ArgumentException

invokeAttr is not an invocation attribute from BindingFlags.

ArgumentException

invokeAttr specifies both get and set for a property or field.

ArgumentException

invokeAttr specifies both a field set and an Invoke method. args are provided for a field get.

ArgumentException

More than one argument is specified for a field set.

MissingFieldException

The field or property cannot be found.

MissingMethodException

The method cannot be found.

SecurityException

A private member is invoked without the necessary ReflectionPermission.

The method that is to be invoked must be accessible and provide the most specific match with the specified argument list, under the constraints of the specified binder and invocation attributes.

A method is invoked if the number of parameters in the method declaration equals the number of arguments in the specified argument list, and the type of each argument can be converted by the binder to the type of the parameter.

NoteNote

The array of parameter modifiers passed in to InvokeMember must contain a single parameter modifier. Only the first parameter modifier is considered when determining which argument needs to be passed by reference when exposed to COM.

The binder finds all matching methods, in accordance with the type of binding requested (BindingFlags.InvokeMethod, GetProperties, and so on). The set of methods is filtered by the name, number of arguments, and a set of search modifiers defined in the binder. After the method is selected, it is invoked, and accessibility is checked at that point. The search may control which set of methods is searched based upon the accessibility attribute associated with the method. BindToMethod selects the method to be invoked. The default binder selects the most specific match.

Access restrictions are ignored for fully trusted code. That is, private constructors, methods, fields, and properties can be accessed and invoked through reflection whenever the code is fully trusted.

The following example obtains the value of the Now property.

using System;
using System.Reflection;

public class MainClass 
{ 
    public static void Main(string[] args)
    {
        Type tDate = typeof(System.DateTime);
        Object result = tDate.InvokeMember("Now", 
            BindingFlags.GetProperty, null, null, new Object[0]);
        Console.WriteLine(result.ToString());
    }
}

import System.*;
import System.Reflection.*;

public class MainClass
{   
    public static void main(String[] args)
    {
        Type tDate = Type.GetType("System.DateTime");
        Object result = tDate.InvokeMember("Now", 
            BindingFlags.GetProperty, null, null, new Object[0]);
        Console.WriteLine(result.ToString());
    } //main
} //MainClass

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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