MethodBase.Invoke Método

Definición

Invoca el método o constructor que refleja esta instancia de MethodInfo.Invokes the method or constructor reflected by this MethodInfo instance.

Sobrecargas

Invoke(Object, Object[])

Invoca el método o constructor representado por la instancia actual, utilizando los parámetros especificados.Invokes the method or constructor represented by the current instance, using the specified parameters.

Invoke(Object, BindingFlags, Binder, Object[], CultureInfo)

Cuando se reemplaza en una clase derivada, invoca el método o constructor reflejado con los parámetros especificados.When overridden in a derived class, invokes the reflected method or constructor with the given parameters.

Invoke(Object, Object[])

Invoca el método o constructor representado por la instancia actual, utilizando los parámetros especificados.Invokes the method or constructor represented by the current instance, using the specified parameters.

public:
 System::Object ^ Invoke(System::Object ^ obj, cli::array <System::Object ^> ^ parameters);
public object Invoke (object obj, object[] parameters);
member this.Invoke : obj * obj[] -> obj
Public Function Invoke (obj As Object, parameters As Object()) As Object

Parámetros

obj
Object

Objeto en el que se va a invocar al método o constructor.The object on which to invoke the method or constructor. Si el método es estático, se omite este argumento.If a method is static, this argument is ignored. Si un constructor es estático, este argumento debe ser null o una instancia de la clase que define el constructor.If a constructor is static, this argument must be null or an instance of the class that defines the constructor.

parameters
Object[]

Lista de argumentos del método o constructor invocado.An argument list for the invoked method or constructor. Esta es una matriz de objetos con el mismo número, orden y tipo que los parámetros del método o constructor al que se van a invocar.This is an array of objects with the same number, order, and type as the parameters of the method or constructor to be invoked. Si no hay ningún parámetro, parameters deberá ser null.If there are no parameters, parameters should be null.

Si el método o constructor representado por esta instancia tiene un parámetro ref (ByRef en Visual Basic), no es necesario ningún atributo especial para ese parámetro para invocar el método o constructor mediante esta función.If the method or constructor represented by this instance takes a ref parameter (ByRef in Visual Basic), no special attribute is required for that parameter in order to invoke the method or constructor using this function. Cualquier objeto de esta matriz que no se inicialice explícitamente con un valor contendrá el valor predeterminado de este tipo de objeto.Any object in this array that is not explicitly initialized with a value will contain the default value for that object type. Para los elementos de tipo de referencia, este valor es null.For reference-type elements, this value is null. Para los elementos de tipo de valor, este valor es 0, 0.0 o false, en función del tipo de elemento específico.For value-type elements, this value is 0, 0.0, or false, depending on the specific element type.

Devoluciones

Objeto que contiene el valor devuelto del método invocado, o null en caso de un constructor.An object containing the return value of the invoked method, or null in the case of a constructor.

Implementaciones

Excepciones

En las aplicaciones .NET para la Tienda Windows o la Biblioteca de clases portable, capture Exception en su lugar.In the.NET for Windows Store apps or the Portable Class Library, catch Exception instead.

El parámetro obj es null y el método no es estático.The obj parameter is null and the method is not static. O bien-or- La clase de obj no declara ni hereda el método.The method is not declared or inherited by the class of obj. O bien-or- Se invoca un constructor estático, y obj no es ni null ni una instancia de la clase que declaró el constructor.A static constructor is invoked, and obj is neither null nor an instance of the class that declared the constructor.

Los elementos de la matriz parameters no coinciden con la firma del método o constructor que esta instancia refleja.The elements of the parameters array do not match the signature of the method or constructor reflected by this instance.

El método o constructor invocado produce una excepción.The invoked method or constructor throws an exception.

o bien-or- La instancia actual es un DynamicMethod que contiene código no comprobable.The current instance is a DynamicMethod that contains unverifiable code. Vea la sección "Comprobación" en Comentarios para DynamicMethod.See the "Verification" section in Remarks for DynamicMethod.

La matriz parameters no tiene el número correcto de argumentos.The parameters array does not have the correct number of arguments.

En .NET para aplicaciones de la Tienda Windows o la Biblioteca de clases portable, capture en su lugar la excepción de clase base, MemberAccessException.In the .NET for Windows Store apps or the Portable Class Library, catch the base class exception, MemberAccessException, instead.

El autor de la llamada no tiene permiso para ejecutar el método o constructor representado por la instancia actual.The caller does not have permission to execute the method or constructor that is represented by the current instance.

El tipo que declara el método es un tipo genérico abierto.The type that declares the method is an open generic type. Es decir, la propiedad ContainsGenericParameters devuelve true para el tipo declarador.That is, the ContainsGenericParameters property returns true for the declaring type.

La instancia actual es un MethodBuilder.The current instance is a MethodBuilder.

Ejemplos

En el ejemplo de código siguiente se muestra la búsqueda dinámica de métodos mediante la reflexión.The following code example demonstrates dynamic method lookup using reflection. Tenga en cuenta que no puede MethodInfo utilizar el objeto de la clase base para invocar el método invalidado en la clase derivada, porque el enlace en tiempo de ejecución no puede resolver invalidaciones.Note that you cannot use the MethodInfo object from the base class to invoke the overridden method in the derived class, because late binding cannot resolve overrides.

using namespace System;
using namespace System::Reflection;

public ref class MagicClass
{
private:
    int magicBaseValue;

public:
    MagicClass()
    {
        magicBaseValue = 9;
    }

    int ItsMagic(int preMagic)
    {
        return preMagic * magicBaseValue;
    }
};

public ref class TestMethodInfo
{
public:
    static void Main()
    {
        // Get the constructor and create an instance of MagicClass

        Type^ magicType = Type::GetType("MagicClass");
        ConstructorInfo^ magicConstructor = magicType->GetConstructor(Type::EmptyTypes);
        Object^ magicClassObject = magicConstructor->Invoke(gcnew array<Object^>(0));

        // Get the ItsMagic method and invoke with a parameter value of 100

        MethodInfo^ magicMethod = magicType->GetMethod("ItsMagic");
        Object^ magicValue = magicMethod->Invoke(magicClassObject, gcnew array<Object^>(1){100});

        Console::WriteLine("MethodInfo.Invoke() Example\n");
        Console::WriteLine("MagicClass.ItsMagic() returned: {0}", magicValue);
    }
};

int main()
{
    TestMethodInfo::Main();
}

// The example program gives the following output:
//
// MethodInfo.Invoke() Example
//
// MagicClass.ItsMagic() returned: 900
using System;
using System.Reflection;

public class MagicClass
{
    private int magicBaseValue;

    public MagicClass()
    {
        magicBaseValue = 9;
    }
    
    public int ItsMagic(int preMagic)
    {
        return preMagic * magicBaseValue;
    }
}

public class TestMethodInfo
{
    public static void Main()
    {
        // Get the constructor and create an instance of MagicClass

        Type magicType = Type.GetType("MagicClass");
        ConstructorInfo magicConstructor = magicType.GetConstructor(Type.EmptyTypes);
        object magicClassObject = magicConstructor.Invoke(new object[]{});

        // Get the ItsMagic method and invoke with a parameter value of 100

        MethodInfo magicMethod = magicType.GetMethod("ItsMagic");
        object magicValue = magicMethod.Invoke(magicClassObject, new object[]{100});

        Console.WriteLine("MethodInfo.Invoke() Example\n");
        Console.WriteLine("MagicClass.ItsMagic() returned: {0}", magicValue);
    }
}

// The example program gives the following output:
//
// MethodInfo.Invoke() Example
//
// MagicClass.ItsMagic() returned: 900
Imports System.Reflection

Public Class MagicClass
    Private magicBaseValue As Integer

    Public Sub New()
        magicBaseValue = 9
    End Sub

    Public Function ItsMagic(preMagic As Integer) As Integer
        Return preMagic * magicBaseValue
    End Function
End Class

Public Class TestMethodInfo
    Public Shared Sub Main()
        ' Get the constructor and create an instance of MagicClass

        Dim magicType As Type = Type.GetType("MagicClass")
        Dim magicConstructor As ConstructorInfo = magicType.GetConstructor(Type.EmptyTypes)
        Dim magicClassObject As Object = magicConstructor.Invoke(New Object(){})

        ' Get the ItsMagic method and invoke with a parameter value of 100

        Dim magicMethod As MethodInfo = magicType.GetMethod("ItsMagic")
        Dim magicValue As Object = magicMethod.Invoke(magicClassObject, New Object(){100})

        Console.WriteLine("MethodInfo.Invoke() Example" + vbNewLine)
        Console.WriteLine("MagicClass.ItsMagic() returned: {0}", magicValue)
    End Sub
End Class

' The example program gives the following output:
'
' MethodInfo.Invoke() Example
'
' MagicClass.ItsMagic() returned: 900

Comentarios

Se trata de un método útil que llama Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) a la sobrecarga del Default método invokeAttr , pasando binder por culturey null para y.This is a convenience method that calls the Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) method overload, passing Default for invokeAttr and null for binder and culture.

Si el método invocado produce una excepción, el Exception.GetBaseException método devuelve la excepción.If the invoked method throws an exception, the Exception.GetBaseException method returns the exception.

Para invocar un método estático mediante MethodInfo su objeto, null pase objpara.To invoke a static method using its MethodInfo object, pass null for obj.

Nota

Si esta sobrecarga del método se utiliza para invocar un constructor de instancia, se obj reinicializa el objeto proporcionado para; es decir, se ejecutan todos los inicializadores de instancia.If this method overload is used to invoke an instance constructor, the object supplied for obj is reinitialized; that is, all instance initializers are executed. El valor devuelto es null.The return value is null. Si se invoca un constructor de clase, se reinicializa la clase; es decir, se ejecutan todos los inicializadores de clase.If a class constructor is invoked, the class is reinitialized; that is, all class initializers are executed. El valor devuelto es null.The return value is null.

Nota

A partir de ReflectionPermission ReflectionPermissionFlag.RestrictedMemberAccess , este método se puede utilizar para tener acceso a los miembros no públicos si el llamador se ha concedido con la marca y si el conjunto de permisos de los miembros no públicos está restringido al conjunto de permisos del llamador o a un .NET Framework 2.0 Service Pack 1.NET Framework 2.0 Service Pack 1subconjunto. mismo.Starting with the .NET Framework 2.0 Service Pack 1.NET Framework 2.0 Service Pack 1, this method can be used to access non-public members if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the non-public members is restricted to the caller's grant set, or a subset thereof. (Consulte consideraciones de seguridad para la reflexión).(See Security Considerations for Reflection.)

Para utilizar esta funcionalidad, la aplicación debe utilizar .NET Framework 3,5.NET Framework 3.5 o posterior como destino.To use this functionality, your application should target the .NET Framework 3,5.NET Framework 3.5 or later.

Si un parámetro del método actual es un tipo de valor y el argumento correspondiente en parameters es null, el tiempo de ejecución pasa una instancia inicializada con cero del tipo de valor.If a parameter of the current method is a value type, and the corresponding argument in parameters is null, the runtime passes a zero-initialized instance of the value type.

Seguridad

ReflectionPermission
Cuando se invoca enlazado en tiempo de ejecución mediante InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[])mecanismos como.when invoked late-bound through mechanisms such as InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[]). Enumeración asociada: MemberAccess.Associated enumeration: MemberAccess.

Consulte también:

Invoke(Object, BindingFlags, Binder, Object[], CultureInfo)

Cuando se reemplaza en una clase derivada, invoca el método o constructor reflejado con los parámetros especificados.When overridden in a derived class, invokes the reflected method or constructor with the given parameters.

public:
 abstract System::Object ^ Invoke(System::Object ^ obj, System::Reflection::BindingFlags invokeAttr, System::Reflection::Binder ^ binder, cli::array <System::Object ^> ^ parameters, System::Globalization::CultureInfo ^ culture);
public abstract object Invoke (object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, object[] parameters, System.Globalization.CultureInfo culture);
abstract member Invoke : obj * System.Reflection.BindingFlags * System.Reflection.Binder * obj[] * System.Globalization.CultureInfo -> obj

Parámetros

obj
Object

Objeto en el que se va a invocar al método o constructor.The object on which to invoke the method or constructor. Si el método es estático, se omite este argumento.If a method is static, this argument is ignored. Si un constructor es estático, este argumento debe ser null o una instancia de la clase que define el constructor.If a constructor is static, this argument must be null or an instance of the class that defines the constructor.

invokeAttr
BindingFlags

Una máscara de bits que es una combinación de 0 o más marcas de bits de BindingFlags.A bitmask that is a combination of 0 or more bit flags from BindingFlags. Si binder es null, se asignará el valor Default a este parámetro; por lo tanto, se omitirá cualquier valor que se pase.If binder is null, this parameter is assigned the value Default; thus, whatever you pass in is ignored.

binder
Binder

Objeto que habilita el enlace, la conversión de tipos de argumentos, las llamadas a miembros y la recuperación de objetos MemberInfo mediante reflexión.An object that enables the binding, coercion of argument types, invocation of members, and retrieval of MemberInfo objects via reflection. Si binder es null, se usa el enlazador predeterminado.If binder is null, the default binder is used.

parameters
Object[]

Lista de argumentos del método o constructor invocado.An argument list for the invoked method or constructor. Esta es una matriz de objetos con el mismo número, orden y tipo que los parámetros del método o constructor al que se van a invocar.This is an array of objects with the same number, order, and type as the parameters of the method or constructor to be invoked. Si no hay ningún parámetro, debe ser null.If there are no parameters, this should be null.

Si el método o constructor que representa esta instancia adopta un parámetro ByRef, éste no necesita ningún atributo especial para que pueda invocar el método o constructor utilizando esta función.If the method or constructor represented by this instance takes a ByRef parameter, there is no special attribute required for that parameter in order to invoke the method or constructor using this function. Cualquier objeto de esta matriz que no se inicialice explícitamente con un valor contendrá el valor predeterminado de este tipo de objeto.Any object in this array that is not explicitly initialized with a value will contain the default value for that object type. Para los elementos de tipo de referencia, este valor es null.For reference-type elements, this value is null. Para los elementos de tipo de valor, este valor es 0, 0.0 o false, en función del tipo de elemento específico.For value-type elements, this value is 0, 0.0, or false, depending on the specific element type.

culture
CultureInfo

Instancia de CultureInfo usada para regir la conversión de tipos.An instance of CultureInfo used to govern the coercion of types. Si es null, se utiliza CultureInfo para el subproceso actual.If this is null, the CultureInfo for the current thread is used. (Esto es necesario para convertir un objeto String que representa 1000 en un valor Double, por ejemplo, dado que 1000 se representa de maneras diferentes según la referencia cultural).(This is necessary to convert a String that represents 1000 to a Double value, for example, since 1000 is represented differently by different cultures.)

Devoluciones

Un tipo Object que contiene el valor devuelto del método invocado, o un objeto null en el caso de un constructor, o null si el tipo de valor devuelto del método es void.An Object containing the return value of the invoked method, or null in the case of a constructor, or null if the method's return type is void. Antes de llamar al método o constructor, Invoke comprueba si el usuario tiene permiso de acceso y si los parámetros son válidos.Before calling the method or constructor, Invoke checks to see if the user has access permission and verifies that the parameters are valid.

Implementaciones

Excepciones

El parámetro obj es null y el método no es estático.The obj parameter is null and the method is not static.

O bien-or- La clase de obj no declara ni hereda el método.The method is not declared or inherited by the class of obj.

O bien-or- Se invoca un constructor estático, y obj no es ni null ni una instancia de la clase que declaró el constructor.A static constructor is invoked, and obj is neither null nor an instance of the class that declared the constructor.

El tipo del parámetro parameters no coincide con la firma del método o constructor que esta instancia refleja.The type of the parameters parameter does not match the signature of the method or constructor reflected by this instance.

La matriz parameters no tiene el número correcto de argumentos.The parameters array does not have the correct number of arguments.

El método o constructor invocado produce una excepción.The invoked method or constructor throws an exception.

El autor de la llamada no tiene permiso para ejecutar el método o constructor representado por la instancia actual.The caller does not have permission to execute the method or constructor that is represented by the current instance.

El tipo que declara el método es un tipo genérico abierto.The type that declares the method is an open generic type. Es decir, la propiedad ContainsGenericParameters devuelve true para el tipo declarador.That is, the ContainsGenericParameters property returns true for the declaring type.

Ejemplos

En el ejemplo siguiente se muestran todos los System.Reflection.Binder miembros de la clase mediante Type.InvokeMemberuna sobrecarga de.The following example demonstrates all members of the System.Reflection.Binder class using an overload of Type.InvokeMember. El método CanConvertFrom privado busca tipos compatibles para un tipo determinado.The private method CanConvertFrom finds compatible types for a given type. Para obtener otro ejemplo de la invocación de miembros en un escenario de enlace personalizado, vea cargar y usar tipos dinámicamente.For another example of invoking members in a custom binding scenario, see Dynamically Loading and Using Types.

using namespace System;
using namespace System::Reflection;
using namespace System::Globalization;
using namespace System::Runtime::InteropServices;
public ref class MyBinder: public Binder
{
public:
   MyBinder()
      : Binder()
   {}

private:
   ref class BinderState
   {
   public:
      array<Object^>^args;
   };

public:
   virtual FieldInfo^ BindToField( BindingFlags bindingAttr, array<FieldInfo^>^match, Object^ value, CultureInfo^ culture ) override
   {
      if ( match == nullptr )
            throw gcnew ArgumentNullException( "match" );

      // Get a field for which the value parameter can be converted to the specified field type.
      for ( int i = 0; i < match->Length; i++ )
         if ( ChangeType( value, match[ i ]->FieldType, culture ) != nullptr )
                  return match[ i ];

      return nullptr;
   }

   virtual MethodBase^ BindToMethod( BindingFlags bindingAttr, array<MethodBase^>^match, array<Object^>^%args, array<ParameterModifier>^ modifiers, CultureInfo^ culture, array<String^>^names, [Out]Object^% state ) override
   {
      // Store the arguments to the method in a state Object*.
      BinderState^ myBinderState = gcnew BinderState;
      array<Object^>^arguments = gcnew array<Object^>(args->Length);
      args->CopyTo( arguments, 0 );
      myBinderState->args = arguments;
      state = myBinderState;
      if ( match == nullptr )
            throw gcnew ArgumentNullException;

      // Find a method that has the same parameters as those of the args parameter.
      for ( int i = 0; i < match->Length; i++ )
      {
         // Count the number of parameters that match.
         int count = 0;
         array<ParameterInfo^>^parameters = match[ i ]->GetParameters();

         // Go on to the next method if the number of parameters do not match.
         if ( args->Length != parameters->Length )
                  continue;

         // Match each of the parameters that the user expects the method to have.
         for ( int j = 0; j < args->Length; j++ )
         {
            // If the names parameter is not 0, then reorder args.
            if ( names != nullptr )
            {
               if ( names->Length != args->Length )
                              throw gcnew ArgumentException( "names and args must have the same number of elements." );

               for ( int k = 0; k < names->Length; k++ )
                  if ( String::Compare( parameters[ j ]->Name, names[ k ] ) == 0 )
                                    args[ j ] = myBinderState->args[ k ];
            }

            // Determine whether the types specified by the user can be converted to the parameter type.
            if ( ChangeType( args[ j ], parameters[ j ]->ParameterType, culture ) != nullptr )
                        count += 1;
            else
                        break;
         }
         if ( count == args->Length )
                  return match[ i ];
      }
      return nullptr;
   }

   virtual Object^ ChangeType( Object^ value, Type^ myChangeType, CultureInfo^ culture ) override
   {
      // Determine whether the value parameter can be converted to a value of type myType.
      if ( CanConvertFrom( value->GetType(), myChangeType ) )
         // Return the converted Object*.
         return Convert::ChangeType( value, myChangeType ); 
      else
         return nullptr;
   }

   virtual void ReorderArgumentArray( array<Object^>^%args, Object^ state ) override
   {
      // Return the args that had been reordered by BindToMethod.
      (safe_cast<BinderState^>(state))->args->CopyTo( args, 0 );
   }

   virtual MethodBase^ SelectMethod( BindingFlags bindingAttr, array<MethodBase^>^match, array<Type^>^types, array<ParameterModifier>^ modifiers ) override
   {
      if ( match == nullptr )
            throw gcnew ArgumentNullException( "match" );

      for ( int i = 0; i < match->Length; i++ )
      {
         // Count the number of parameters that match.
         int count = 0;
         array<ParameterInfo^>^parameters = match[ i ]->GetParameters();

         // Go on to the next method if the number of parameters do not match.
         if ( types->Length != parameters->Length )
                  continue;

         // Match each of the parameters that the user expects the method to have.
         for ( int j = 0; j < types->Length; j++ )
         {
            // Determine whether the types specified by the user can be converted to parameter type.
            if ( CanConvertFrom( types[ j ], parameters[ j ]->ParameterType ) )
                        count += 1;
            else
                        break;
         }
         // Determine whether the method has been found.
         if ( count == types->Length )
                  return match[ i ];
      }
      return nullptr;
   }

   virtual PropertyInfo^ SelectProperty( BindingFlags bindingAttr, array<PropertyInfo^>^match, Type^ returnType, array<Type^>^indexes, array<ParameterModifier>^ modifiers ) override
   {
      if ( match == nullptr )
            throw gcnew ArgumentNullException( "match" );

      for ( int i = 0; i < match->Length; i++ )
      {
         // Count the number of indexes that match.
         int count = 0;
         array<ParameterInfo^>^parameters = match[ i ]->GetIndexParameters();

         // Go on to the next property if the number of indexes do not match.
         if ( indexes->Length != parameters->Length )
                  continue;

         // Match each of the indexes that the user expects the property to have.
         for ( int j = 0; j < indexes->Length; j++ )
            // Determine whether the types specified by the user can be converted to index type.
            if ( CanConvertFrom( indexes[ j ], parameters[ j ]->ParameterType ) )
                        count += 1;
            else
                        break;

         // Determine whether the property has been found.
         if ( count == indexes->Length )
         {
            // Determine whether the return type can be converted to the properties type.
            if ( CanConvertFrom( returnType, match[ i ]->PropertyType ) )
                  return match[ i ];
            else
                  continue;
         }
      }
      return nullptr;
   }

private:

   // Determines whether type1 can be converted to type2. Check only for primitive types.
   bool CanConvertFrom( Type^ type1, Type^ type2 )
   {
      if ( type1->IsPrimitive && type2->IsPrimitive )
      {
         TypeCode typeCode1 = Type::GetTypeCode( type1 );
         TypeCode typeCode2 = Type::GetTypeCode( type2 );

         // If both type1 and type2 have the same type, return true.
         if ( typeCode1 == typeCode2 )
                  return true;

         // Possible conversions from Char follow.
         if ( typeCode1 == TypeCode::Char )
         {
            switch ( typeCode2 )
            {
               case TypeCode::UInt16:
                  return true;

               case TypeCode::UInt32:
                  return true;

               case TypeCode::Int32:
                  return true;

               case TypeCode::UInt64:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from Byte follow.
         if ( typeCode1 == TypeCode::Byte )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Char:
                  return true;

               case TypeCode::UInt16:
                  return true;

               case TypeCode::Int16:
                  return true;

               case TypeCode::UInt32:
                  return true;

               case TypeCode::Int32:
                  return true;

               case TypeCode::UInt64:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from SByte follow.
         if ( typeCode1 == TypeCode::SByte )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Int16:
                  return true;

               case TypeCode::Int32:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from UInt16 follow.
         if ( typeCode1 == TypeCode::UInt16 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::UInt32:
                  return true;

               case TypeCode::Int32:
                  return true;

               case TypeCode::UInt64:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from Int16 follow.
         if ( typeCode1 == TypeCode::Int16 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Int32:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from UInt32 follow.
         if ( typeCode1 == TypeCode::UInt32 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::UInt64:
                  return true;

               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from Int32 follow.
         if ( typeCode1 == TypeCode::Int32 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Int64:
                  return true;

               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from UInt64 follow.
         if ( typeCode1 == TypeCode::UInt64 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from Int64 follow.
         if ( typeCode1 == TypeCode::Int64 )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Single:
                  return true;

               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }

         // Possible conversions from Single follow.
         if ( typeCode1 == TypeCode::Single )
         {
            switch ( typeCode2 )
            {
               case TypeCode::Double:
                  return true;

               default:
                  return false;
            }
         }
      }

      return false;
   }

};

public ref class MyClass1
{
public:
   short myFieldB;
   int myFieldA;
   void MyMethod( long i, char k )
   {
      Console::WriteLine( "\nThis is MyMethod(long i, char k)" );
   }

   void MyMethod( long i, long j )
   {
      Console::WriteLine( "\nThis is MyMethod(long i, long j)" );
   }
};

int main()
{
   // Get the type of MyClass1.
   Type^ myType = MyClass1::typeid;

   // Get the instance of MyClass1.
   MyClass1^ myInstance = gcnew MyClass1;
   Console::WriteLine( "\nDisplaying the results of using the MyBinder binder.\n" );

   // Get the method information for MyMethod.
   array<Type^>^types = {short::typeid,short::typeid};
   MethodInfo^ myMethod = myType->GetMethod( "MyMethod", static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance), gcnew MyBinder, types, nullptr );
   Console::WriteLine( myMethod );

   // Invoke MyMethod.
   array<Object^>^obj = {32,32};
   myMethod->Invoke( myInstance, BindingFlags::InvokeMethod, gcnew MyBinder, obj, CultureInfo::CurrentCulture );
}
using System;
using System.Reflection;
using System.Globalization;

public class MyBinder : Binder 
{
    public MyBinder() : base()
    {
    }
    private class BinderState
    {
        public object[] args;
    }
    public override FieldInfo BindToField(
        BindingFlags bindingAttr,
        FieldInfo[] match,
        object value,
        CultureInfo culture
        )
    {
        if(match == null)
            throw new ArgumentNullException("match");
        // Get a field for which the value parameter can be converted to the specified field type.
        for(int i = 0; i < match.Length; i++)
            if(ChangeType(value, match[i].FieldType, culture) != null)
                return match[i];
        return null;
    }
    public override MethodBase BindToMethod(
        BindingFlags bindingAttr,
        MethodBase[] match,
        ref object[] args,
        ParameterModifier[] modifiers,
        CultureInfo culture,
        string[] names,
        out object state
        )
    {
        // Store the arguments to the method in a state object.
        BinderState myBinderState = new BinderState();
        object[] arguments = new Object[args.Length];
        args.CopyTo(arguments, 0);
        myBinderState.args = arguments;
        state = myBinderState;
        if(match == null)
            throw new ArgumentNullException();
        // Find a method that has the same parameters as those of the args parameter.
        for(int i = 0; i < match.Length; i++)
        {
            // Count the number of parameters that match.
            int count = 0;
            ParameterInfo[] parameters = match[i].GetParameters();
            // Go on to the next method if the number of parameters do not match.
            if(args.Length != parameters.Length)
                continue;
            // Match each of the parameters that the user expects the method to have.
            for(int j = 0; j < args.Length; j++)
            {
                // If the names parameter is not null, then reorder args.
                if(names != null)
                {
                    if(names.Length != args.Length)
                        throw new ArgumentException("names and args must have the same number of elements.");
                    for(int k = 0; k < names.Length; k++)
                        if(String.Compare(parameters[j].Name, names[k].ToString()) == 0)
                            args[j] = myBinderState.args[k];
                }
                // Determine whether the types specified by the user can be converted to the parameter type.
                if(ChangeType(args[j], parameters[j].ParameterType, culture) != null)
                    count += 1;
                else
                    break;
            }
            // Determine whether the method has been found.
            if(count == args.Length)
                return match[i];
        }
        return null;
    }
    public override object ChangeType(
        object value,
        Type myChangeType,
        CultureInfo culture
        )
    {
        // Determine whether the value parameter can be converted to a value of type myType.
        if(CanConvertFrom(value.GetType(), myChangeType))
            // Return the converted object.
            return Convert.ChangeType(value, myChangeType);
        else
            // Return null.
            return null;
    }
    public override void ReorderArgumentArray(
        ref object[] args,
        object state
        )
    {
        // Return the args that had been reordered by BindToMethod.
        ((BinderState)state).args.CopyTo(args, 0);
    }
    public override MethodBase SelectMethod(
        BindingFlags bindingAttr,
        MethodBase[] match,
        Type[] types,
        ParameterModifier[] modifiers
        )
    {
        if(match == null)
            throw new ArgumentNullException("match");
        for(int i = 0; i < match.Length; i++)
        {
            // Count the number of parameters that match.
            int count = 0; 
            ParameterInfo[] parameters = match[i].GetParameters();
            // Go on to the next method if the number of parameters do not match.
            if(types.Length != parameters.Length)
                continue;
            // Match each of the parameters that the user expects the method to have.
            for(int j = 0; j < types.Length; j++)
                // Determine whether the types specified by the user can be converted to parameter type.
                if(CanConvertFrom(types[j], parameters[j].ParameterType))
                    count += 1;
                else
                    break;
            // Determine whether the method has been found.
            if(count == types.Length)
                return match[i];
        }
        return null;
    }
    public override PropertyInfo SelectProperty(
        BindingFlags bindingAttr,
        PropertyInfo[] match,
        Type returnType,
        Type[] indexes,
        ParameterModifier[] modifiers
        )
    {
        if(match == null)
            throw new ArgumentNullException("match");
        for(int i = 0; i < match.Length; i++)
        {
            // Count the number of indexes that match.
            int count = 0;
            ParameterInfo[] parameters = match[i].GetIndexParameters();
            // Go on to the next property if the number of indexes do not match.
            if(indexes.Length != parameters.Length)
                continue;
            // Match each of the indexes that the user expects the property to have.
            for(int j = 0; j < indexes.Length; j++)
                // Determine whether the types specified by the user can be converted to index type.
                if(CanConvertFrom(indexes[j], parameters[j].ParameterType))
                    count += 1;
                else
                    break;
            // Determine whether the property has been found.
            if(count == indexes.Length)
                // Determine whether the return type can be converted to the properties type.
                if(CanConvertFrom(returnType, match[i].PropertyType))
                    return match[i];
                else
                    continue;
        }
        return null;
    }
    // Determines whether type1 can be converted to type2. Check only for primitive types.
    private bool CanConvertFrom(Type type1, Type type2)
    {
        if(type1.IsPrimitive && type2.IsPrimitive)
        {
            TypeCode typeCode1 = Type.GetTypeCode(type1);
            TypeCode typeCode2 = Type.GetTypeCode(type2);
            // If both type1 and type2 have the same type, return true.
            if(typeCode1 == typeCode2)
                return true;
            // Possible conversions from Char follow.
            if(typeCode1 == TypeCode.Char)
                switch(typeCode2)
                {
                    case TypeCode.UInt16 : return true;
                    case TypeCode.UInt32 : return true;
                    case TypeCode.Int32  : return true;
                    case TypeCode.UInt64 : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from Byte follow.
            if(typeCode1 == TypeCode.Byte)
                switch(typeCode2)
                {
                    case TypeCode.Char   : return true;
                    case TypeCode.UInt16 : return true;
                    case TypeCode.Int16  : return true;
                    case TypeCode.UInt32 : return true;
                    case TypeCode.Int32  : return true;
                    case TypeCode.UInt64 : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from SByte follow.
            if(typeCode1 == TypeCode.SByte)
                switch(typeCode2)
                {
                    case TypeCode.Int16  : return true;
                    case TypeCode.Int32  : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from UInt16 follow.
            if(typeCode1 == TypeCode.UInt16)
                switch(typeCode2)
                {
                    case TypeCode.UInt32 : return true;
                    case TypeCode.Int32  : return true;
                    case TypeCode.UInt64 : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from Int16 follow.
            if(typeCode1 == TypeCode.Int16)
                switch(typeCode2)
                {
                    case TypeCode.Int32  : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from UInt32 follow.
            if(typeCode1 == TypeCode.UInt32)
                switch(typeCode2)
                {
                    case TypeCode.UInt64 : return true;
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from Int32 follow.
            if(typeCode1 == TypeCode.Int32)
                switch(typeCode2)
                {
                    case TypeCode.Int64  : return true;
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from UInt64 follow.
            if(typeCode1 == TypeCode.UInt64)
                switch(typeCode2)
                {
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from Int64 follow.
            if(typeCode1 == TypeCode.Int64)
                switch(typeCode2)
                {
                    case TypeCode.Single : return true;
                    case TypeCode.Double : return true;
                    default              : return false;
                }
            // Possible conversions from Single follow.
            if(typeCode1 == TypeCode.Single)
                switch(typeCode2)
                {
                    case TypeCode.Double : return true;
                    default              : return false;
                }
        }
        return false;
    }
}
public class MyClass1
{
    public short myFieldB;
    public int myFieldA; 
    public void MyMethod(long i, char k)
    {
        Console.WriteLine("\nThis is MyMethod(long i, char k)");
    }
    public void MyMethod(long i, long j)
    {
        Console.WriteLine("\nThis is MyMethod(long i, long j)");
    }
}
public class Binder_Example
{
    public static void Main()
    {
        // Get the type of MyClass1.
        Type myType = typeof(MyClass1);
        // Get the instance of MyClass1.
        MyClass1 myInstance = new MyClass1();
        Console.WriteLine("\nDisplaying the results of using the MyBinder binder.\n");
        // Get the method information for MyMethod.
        MethodInfo myMethod = myType.GetMethod("MyMethod", BindingFlags.Public | BindingFlags.Instance,
            new MyBinder(), new Type[] {typeof(short), typeof(short)}, null);
        Console.WriteLine(myMethod);
        // Invoke MyMethod.
        myMethod.Invoke(myInstance, BindingFlags.InvokeMethod, new MyBinder(), new Object[] {(int)32, (int)32}, CultureInfo.CurrentCulture);
    }
}
Imports System.Reflection
Imports System.Globalization

Public Class MyBinder
    Inherits Binder
    Public Sub New()
        MyBase.new()
    End Sub
    Private Class BinderState
        Public args() As Object
    End Class

    Public Overrides Function BindToField(ByVal bindingAttr As BindingFlags, ByVal match() As FieldInfo, ByVal value As Object, ByVal culture As CultureInfo) As FieldInfo
        If match Is Nothing Then
            Throw New ArgumentNullException("match")
        End If
        ' Get a field for which the value parameter can be converted to the specified field type.
        Dim i As Integer
        For i = 0 To match.Length - 1
            If Not (ChangeType(value, match(i).FieldType, culture) Is Nothing) Then
                Return match(i)
            End If
        Next i
        Return Nothing
    End Function 'BindToField

    Public Overrides Function BindToMethod(ByVal bindingAttr As BindingFlags, ByVal match() As MethodBase, ByRef args() As Object, ByVal modifiers() As ParameterModifier, ByVal culture As CultureInfo, ByVal names() As String, ByRef state As Object) As MethodBase
        ' Store the arguments to the method in a state object.
        Dim myBinderState As New BinderState()
        Dim arguments() As Object = New [Object](args.Length) {}
        args.CopyTo(arguments, 0)
        myBinderState.args = arguments
        state = myBinderState

        If match Is Nothing Then
            Throw New ArgumentNullException()
        End If
        ' Find a method that has the same parameters as those of args.
        Dim i As Integer
        For i = 0 To match.Length - 1
            ' Count the number of parameters that match.
            Dim count As Integer = 0
            Dim parameters As ParameterInfo() = match(i).GetParameters()
            ' Go on to the next method if the number of parameters do not match.
            If args.Length <> parameters.Length Then
                GoTo ContinueFori
            End If
            ' Match each of the parameters that the user expects the method to have.
            Dim j As Integer
            For j = 0 To args.Length - 1
                ' If names is not null, then reorder args.
                If Not (names Is Nothing) Then
                    If names.Length <> args.Length Then
                        Throw New ArgumentException("names and args must have the same number of elements.")
                    End If
                    Dim k As Integer
                    For k = 0 To names.Length - 1
                        If String.Compare(parameters(j).Name, names(k).ToString()) = 0 Then
                            args(j) = myBinderState.args(k)
                        End If
                    Next k
                End If ' Determine whether the types specified by the user can be converted to parameter type.
                If Not (ChangeType(args(j), parameters(j).ParameterType, culture) Is Nothing) Then
                    count += 1
                Else
                    Exit For
                End If
            Next j
            ' Determine whether the method has been found.
            If count = args.Length Then
                Return match(i)
            End If
ContinueFori:
        Next i
        Return Nothing
    End Function 'BindToMethod

    Public Overrides Function ChangeType(ByVal value As Object, ByVal myChangeType As Type, ByVal culture As CultureInfo) As Object
        ' Determine whether the value parameter can be converted to a value of type myType.
        If CanConvertFrom(value.GetType(), myChangeType) Then
            ' Return the converted object.
            Return Convert.ChangeType(value, myChangeType)
            ' Return null.
        Else
            Return Nothing
        End If
    End Function 'ChangeType

    Public Overrides Sub ReorderArgumentArray(ByRef args() As Object, ByVal state As Object)
        'Redimension the array to hold the state values.
        ReDim args(CType(state, BinderState).args.Length)
        ' Return the args that had been reordered by BindToMethod.
        CType(state, BinderState).args.CopyTo(args, 0)
    End Sub

    Public Overrides Function SelectMethod(ByVal bindingAttr As BindingFlags, ByVal match() As MethodBase, ByVal types() As Type, ByVal modifiers() As ParameterModifier) As MethodBase
        If match Is Nothing Then
            Throw New ArgumentNullException("match")
        End If
        Dim i As Integer
        For i = 0 To match.Length - 1
            ' Count the number of parameters that match.
            Dim count As Integer = 0
            Dim parameters As ParameterInfo() = match(i).GetParameters()
            ' Go on to the next method if the number of parameters do not match.
            If types.Length <> parameters.Length Then
                GoTo ContinueFori
            End If
            ' Match each of the parameters that the user expects the method to have.
            Dim j As Integer
            For j = 0 To types.Length - 1
                ' Determine whether the types specified by the user can be converted to parameter type.
                If CanConvertFrom(types(j), parameters(j).ParameterType) Then
                    count += 1
                Else
                    Exit For
                End If
            Next j ' Determine whether the method has been found.
            If count = types.Length Then
                Return match(i)
            End If
ContinueFori:
        Next i
        Return Nothing
    End Function 'SelectMethod
    Public Overrides Function SelectProperty(ByVal bindingAttr As BindingFlags, ByVal match() As PropertyInfo, ByVal returnType As Type, ByVal indexes() As Type, ByVal modifiers() As ParameterModifier) As PropertyInfo
        If match Is Nothing Then
            Throw New ArgumentNullException("match")
        End If
        Dim i As Integer
        For i = 0 To match.Length - 1
            ' Count the number of indexes that match.
            Dim count As Integer = 0
            Dim parameters As ParameterInfo() = match(i).GetIndexParameters()

            ' Go on to the next property if the number of indexes do not match.
            If indexes.Length <> parameters.Length Then
                GoTo ContinueFori
            End If
            ' Match each of the indexes that the user expects the property to have.
            Dim j As Integer
            For j = 0 To indexes.Length - 1
                ' Determine whether the types specified by the user can be converted to index type.
                If CanConvertFrom(indexes(j), parameters(j).ParameterType) Then
                    count += 1
                Else
                    Exit For
                End If
            Next j ' Determine whether the property has been found.
            If count = indexes.Length Then
                ' Determine whether the return type can be converted to the properties type.
                If CanConvertFrom(returnType, match(i).PropertyType) Then
                    Return match(i)
                Else
                    GoTo ContinueFori
                End If
            End If
ContinueFori:
        Next i
        Return Nothing
    End Function 'SelectProperty

    ' Determine whether type1 can be converted to type2. Check only for primitive types.
    Private Function CanConvertFrom(ByVal type1 As Type, ByVal type2 As Type) As Boolean
        If type1.IsPrimitive And type2.IsPrimitive Then
            Dim typeCode1 As TypeCode = Type.GetTypeCode(type1)
            Dim typeCode2 As TypeCode = Type.GetTypeCode(type2)
            ' If both type1 and type2 have same type, return true.
            If typeCode1 = typeCode2 Then
                Return True
            End If ' Possible conversions from Char follow.
            If typeCode1 = TypeCode.Char Then
                Select Case typeCode2
                    Case TypeCode.UInt16
                        Return True
                    Case TypeCode.UInt32
                        Return True
                    Case TypeCode.Int32
                        Return True
                    Case TypeCode.UInt64
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from Byte follow.
            If typeCode1 = TypeCode.Byte Then
                Select Case typeCode2
                    Case TypeCode.Char
                        Return True
                    Case TypeCode.UInt16
                        Return True
                    Case TypeCode.Int16
                        Return True
                    Case TypeCode.UInt32
                        Return True
                    Case TypeCode.Int32
                        Return True
                    Case TypeCode.UInt64
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from SByte follow.
            If typeCode1 = TypeCode.SByte Then
                Select Case typeCode2
                    Case TypeCode.Int16
                        Return True
                    Case TypeCode.Int32
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from UInt16 follow.
            If typeCode1 = TypeCode.UInt16 Then
                Select Case typeCode2
                    Case TypeCode.UInt32
                        Return True
                    Case TypeCode.Int32
                        Return True
                    Case TypeCode.UInt64
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from Int16 follow.
            If typeCode1 = TypeCode.Int16 Then
                Select Case typeCode2
                    Case TypeCode.Int32
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from UInt32 follow.
            If typeCode1 = TypeCode.UInt32 Then
                Select Case typeCode2
                    Case TypeCode.UInt64
                        Return True
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from Int32 follow.
            If typeCode1 = TypeCode.Int32 Then
                Select Case typeCode2
                    Case TypeCode.Int64
                        Return True
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from UInt64 follow.
            If typeCode1 = TypeCode.UInt64 Then
                Select Case typeCode2
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from Int64 follow.
            If typeCode1 = TypeCode.Int64 Then
                Select Case typeCode2
                    Case TypeCode.Single
                        Return True
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If ' Possible conversions from Single follow.
            If typeCode1 = TypeCode.Single Then
                Select Case typeCode2
                    Case TypeCode.Double
                        Return True
                    Case Else
                        Return False
                End Select
            End If
        End If
        Return False
    End Function 'CanConvertFrom
End Class


Public Class MyClass1
    Public myFieldB As Short
    Public myFieldA As Integer

    Public Overloads Sub MyMethod(ByVal i As Long, ByVal k As Char)
        Console.WriteLine(ControlChars.NewLine & "This is MyMethod(long i, char k).")
    End Sub

    Public Overloads Sub MyMethod(ByVal i As Long, ByVal j As Long)
        Console.WriteLine(ControlChars.NewLine & "This is MyMethod(long i, long j).")
    End Sub
End Class


Public Class Binder_Example
    Public Shared Sub Main()
        ' Get the type of MyClass1.
        Dim myType As Type = GetType(MyClass1)
        ' Get the instance of MyClass1.
        Dim myInstance As New MyClass1()
        Console.WriteLine(ControlChars.Cr & "Displaying the results of using the MyBinder binder.")
        Console.WriteLine()
        ' Get the method information for MyMethod.
        Dim myMethod As MethodInfo = myType.GetMethod("MyMethod", BindingFlags.Public Or BindingFlags.Instance, New MyBinder(), New Type() {GetType(Short), GetType(Short)}, Nothing)
        Console.WriteLine(MyMethod)
        ' Invoke MyMethod.
        myMethod.Invoke(myInstance, BindingFlags.InvokeMethod, New MyBinder(), New [Object]() {CInt(32), CInt(32)}, CultureInfo.CurrentCulture)
    End Sub
End Class

Comentarios

Invoca dinámicamente el método reflejado por esta instancia en objy pasa los parámetros especificados.Dynamically invokes the method reflected by this instance on obj, and passes along the specified parameters. Si el método es estático, se obj omite el parámetro.If the method is static, the obj parameter is ignored. Para los métodos no estáticos obj , debe ser una instancia de una clase que hereda o declara el método y debe ser del mismo tipo que esta clase.For non-static methods, obj should be an instance of a class that inherits or declares the method and must be the same type as this class. Si el método no tiene parámetros, el valor de parameters debe ser null.If the method has no parameters, the value of parameters should be null. De lo contrario, el número, el tipo y el orden parameters de los elementos de deberían ser idénticos al número, tipo y orden de los parámetros del método reflejado por esta instancia.Otherwise, the number, type, and order of elements in parameters should be identical to the number, type, and order of parameters for the method reflected by this instance.

No se pueden omitir los parámetros opcionales en Invokelas llamadas a.You may not omit optional parameters in calls to Invoke. Para invocar un método omitiendo parámetros opcionales, debe llamar Type.InvokeMember a en su lugar.To invoke a method omitting optional parameters, you should call Type.InvokeMember instead.

Nota

Si esta sobrecarga del método se utiliza para invocar un constructor de instancia, se obj reinicializa el objeto proporcionado para; es decir, se ejecutan todos los inicializadores de instancia.If this method overload is used to invoke an instance constructor, the object supplied for obj is reinitialized; that is, all instance initializers are executed. El valor devuelto es null.The return value is null. Si se invoca un constructor de clase, se reinicializa la clase; es decir, se ejecutan todos los inicializadores de clase.If a class constructor is invoked, the class is reinitialized; that is, all class initializers are executed. El valor devuelto es null.The return value is null.

En el caso de los parámetros primitivos de paso a valor, se realiza una ampliación normal (Int16-> Int32, por ejemplo).For pass-by-value primitive parameters, normal widening is performed (Int16 -> Int32, for example). Para los parámetros de referencia de paso a valor, se permite la ampliación de referencia normal (clase derivada a clase base y clase base a tipo de interfaz).For pass-by-value reference parameters, normal reference widening is allowed (derived class to base class, and base class to interface type). Sin embargo, para los parámetros primitivos de paso por referencia, los tipos deben coincidir exactamente.However, for pass-by-reference primitive parameters, the types must match exactly. En el caso de los parámetros de referencia de paso por referencia, se sigue aplicando la ampliación normal.For pass-by-reference reference parameters, the normal widening still applies.

Por ejemplo, si el método reflejado por esta instancia se declara public boolean Compare(String a, String b)como parameters , debe ser una matriz de Objects con longitud 2 tal que parameters[0] = new Object("SomeString1") and parameters[1] = new Object("SomeString2").For example, if the method reflected by this instance is declared as public boolean Compare(String a, String b), then parameters should be an array of Objects with length 2 such that parameters[0] = new Object("SomeString1") and parameters[1] = new Object("SomeString2").

Si un parámetro del método actual es un tipo de valor y el argumento correspondiente en parameters es null, el tiempo de ejecución pasa una instancia inicializada con cero del tipo de valor.If a parameter of the current method is a value type, and the corresponding argument in parameters is null, the runtime passes a zero-initialized instance of the value type.

La reflexión utiliza la búsqueda de método dinámico al invocar métodos virtuales.Reflection uses dynamic method lookup when invoking virtual methods. Por ejemplo, supongamos que la clase B hereda de la clase A y ambos implementan un método virtual denominado M. Ahora Supongamos que tiene MethodInfo un objeto que representa M en la clase a. Si usa el Invoke método para invocar M en un objeto de tipo b, la reflexión usará la implementación proporcionada por la clase b. Aunque el objeto de tipo B se convierta en, se usa la implementación proporcionada por la clase B (vea el ejemplo de código siguiente).For example, suppose that class B inherits from class A and both implement a virtual method named M. Now suppose that you have a MethodInfo object that represents M on class A. If you use the Invoke method to invoke M on an object of type B, then reflection will use the implementation given by class B. Even if the object of type B is cast to A, the implementation given by class B is used (see code sample below).

Por otro lado, si el método no es virtual, la reflexión usará la implementación proporcionada por el tipo a partir del cual MethodInfo se obtuvo, independientemente del tipo de objeto pasado como destino.On the other hand, if the method is non-virtual, then reflection will use the implementation given by the type from which the MethodInfo was obtained, regardless of the type of the object passed as the target.

Las restricciones de acceso se omiten para el código de plena confianza.Access restrictions are ignored for fully trusted code. Es decir, se puede tener acceso a los constructores, métodos, campos y propiedades privados y se pueden invocar mediante reflexión siempre que el código sea de plena confianza.That is, private constructors, methods, fields, and properties can be accessed and invoked via reflection whenever the code is fully trusted.

Si el método invocado produce una excepción, TargetInvocationException.GetException devuelve la excepción.If the invoked method throws an exception, TargetInvocationException.GetException returns the exception. Esta implementación produce una NotSupportedExceptionexcepción.This implementation throws a NotSupportedException.

Nota

A partir de ReflectionPermission ReflectionPermissionFlag.RestrictedMemberAccess , este método se puede utilizar para tener acceso a los miembros no públicos si el llamador se ha concedido con la marca y si el conjunto de permisos de los miembros no públicos está restringido al conjunto de permisos del llamador o a un .NET Framework 2.0 Service Pack 1.NET Framework 2.0 Service Pack 1subconjunto. mismo.Starting with the .NET Framework 2.0 Service Pack 1.NET Framework 2.0 Service Pack 1, this method can be used to access non-public members if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the non-public members is restricted to the caller's grant set, or a subset thereof. (Consulte consideraciones de seguridad para la reflexión).(See Security Considerations for Reflection.)

Para utilizar esta funcionalidad, la aplicación debe utilizar .NET Framework 3,5.NET Framework 3.5 o posterior como destino.To use this functionality, your application should target the .NET Framework 3,5.NET Framework 3.5 or later.

Seguridad

ReflectionPermission
Cuando se invoca enlazado en tiempo de ejecución mediante InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[])mecanismos como.when invoked late-bound through mechanisms such as InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[]). Enumeración asociada: MemberAccess.Associated enumeration: MemberAccess.

Consulte también:

Se aplica a