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Type.GetMethod Method (String, BindingFlags, Binder, Type[], ParameterModifier[])

Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints.

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

public MethodInfo GetMethod (
	string name,
	BindingFlags bindingAttr,
	Binder binder,
	Type[] types,
	ParameterModifier[] modifiers
)
public final MethodInfo GetMethod (
	String name, 
	BindingFlags bindingAttr, 
	Binder binder, 
	Type[] types, 
	ParameterModifier[] modifiers
)
public final function GetMethod (
	name : String, 
	bindingAttr : BindingFlags, 
	binder : Binder, 
	types : Type[], 
	modifiers : ParameterModifier[]
) : MethodInfo

Parameters

name

The String containing the name of the method to get.

bindingAttr

A bitmask comprised of one or more BindingFlags that specify how the search is conducted.

-or-

Zero, to return a null reference (Nothing in Visual Basic).

binder

A Binder object that defines a set of properties and enables binding, which can involve selection of an overloaded method, coercion of argument types, and invocation of a member through reflection.

-or-

a null reference (Nothing in Visual Basic), to use the DefaultBinder.

types

An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or-

An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

modifiers

An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types array. The default binder does not process this parameter.

Return Value

A MethodInfo object representing the method that matches the specified requirements, if found; otherwise, a null reference (Nothing in Visual Basic).
Exception typeCondition

AmbiguousMatchException

More than one method is found with the specified name and matching the specified binding constraints.

ArgumentNullException

name is a null reference (Nothing in Visual Basic).

-or-

types is a null reference (Nothing in Visual Basic).

-or-

One of the elements in types is a null reference (Nothing in Visual Basic).

ArgumentException

types is multidimensional.

-or-

modifiers is multidimensional.

-or-

types and modifiers do not have the same length.

Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection.Binder class to write a custom binder that does process modifiers. ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

The types array and the modifiers array have the same length. A parameter specified in the types array can have the following attributes, which are specified in the modifiers array: pdIn, pdOut, pdLcid, pdRetval, pdOptional, and pdHasDefault, which represent [In], [Out], [lcid], [retval], [optional], and a value specifying whether the parameter has a default value. A parameter's associated attributes are stored in the metadata and enhance interoperability.

The following BindingFlags filter flags can be used to define which methods to include in the search:

  • You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.

  • Specify BindingFlags.Public to include public methods in the search.

  • Specify BindingFlags.NonPublic to include nonpublic methods (that is, private and protected members) in the search.

  • Specify BindingFlags.FlattenHierarchy to include public and protected static members up the hierarchy; private static members in inherited classes are not included.

The following BindingFlags modifier flags can be used to change how the search works:

  • BindingFlags.IgnoreCase to ignore the case of name.

  • BindingFlags.DeclaredOnly to search only the methods declared on the Type, not methods that were simply inherited.

See System.Reflection.BindingFlags for more information.

If the requested type is non-public and the caller does not have ReflectionPermission to reflect non-public objects outside the current assembly, this method returns a null reference (Nothing in Visual Basic).

NoteNote

You cannot omit parameters when looking up constructors and methods. You can only omit parameters when invoking.

If the current T:System.Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

NoteNote

For generic methods, do not include the type arguments in name. For example, the C# code GetMember("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int.

The following example gets method information and displays the signature and declaring type.


using System;
using System.Reflection;

public class MyClass
{
    public int i = 10;
    public string k = "My Field";
    public int MyMethod(int i)
    {
        this.i = i;
        return i;
    }
    public string MyMethod(string k)
    {
        this.k = k;
        return k;
    }
}
public class Type_GetMethod
{
    public static void Main()
    {
        try
        {
            // Get the type of MyClass.
            Type myType = typeof(MyClass);
            // Get the attributes and metadata of MyMethod.
            MethodInfo myMethodInfo = myType.GetMethod("MyMethod", 
                BindingFlags.Public | BindingFlags.Instance, null, 
                new Type[] {typeof(int)}, null);
            Console.WriteLine("\n Declaring type of the method {0} is: \n {1}", myMethodInfo,
                myMethodInfo.DeclaringType);
            // Get the attributes and metadata of MyMethod.
            MethodInfo myMethodInfo1 = myType.GetMethod("MyMethod", 
                BindingFlags.Public | BindingFlags.Instance, null, 
                new Type[] {typeof(string)}, null);
            Console.WriteLine("\n Declaring type of the method {0} is: \n {1}", myMethodInfo1,
                myMethodInfo1.DeclaringType);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception: {0}", e.Message);
        }
    }
}


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

public class MyClass
{
    public int i = 10;
    public String k = "My Field";

    public int MyMethod(int i)
    {
        this.i = i;
        return i;
    } //MyMethod

    public String MyMethod(String k)
    {
        this.k = k;
        return k;
    } //MyMethod
} //MyClass

public class Type_GetMethod
{
    public static void main(String[] args)
    {
        try {
            // Get the type of MyClass.
            Type myType = MyClass.class.ToType();
            // Get the attributes and metadata of MyMethod.
            MethodInfo myMethodInfo = myType.GetMethod("MyMethod",
                BindingFlags.Public | BindingFlags.Instance, null,
                new Type[] { int.class.ToType() }, null);
            Console.WriteLine("\n Declaring type of the method {0} is: \n {1}",
                myMethodInfo, myMethodInfo.get_DeclaringType());
            // Get the attributes and metadata of MyMethod.
            MethodInfo myMethodInfo1 = myType.GetMethod("MyMethod",
                BindingFlags.Public | BindingFlags.Instance, null,
                new Type[] { String.class.ToType() }, null);
            Console.WriteLine("\n Declaring type of the method {0} is: \n {1}",
                myMethodInfo1, myMethodInfo1.get_DeclaringType());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception: {0}", e.get_Message());
        }
    } //main
} //Type_GetMethod

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

.NET Compact Framework

Supported in: 2.0, 1.0
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