MissingFieldException Clase

Definición

Excepción que se produce cuando se intenta tener acceso dinámicamente a un campo que no existe.The exception that is thrown when there is an attempt to dynamically access a field that does not exist. Si se ha quitado o cambiado el nombre de un campo en una biblioteca de clases, vuelva a compilar los ensamblados que hagan referencia a dicha biblioteca.If a field in a class library has been removed or renamed, recompile any assemblies that reference that library.

public ref class MissingFieldException : MissingMemberException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class MissingFieldException : MissingMemberException
type MissingFieldException = class
    inherit MissingMemberException
    interface ISerializable
Public Class MissingFieldException
Inherits MissingMemberException
Herencia
Atributos
Implementaciones

Ejemplos

En este ejemplo se muestra lo que ocurre si intenta usar la reflexión para llamar a un método que no existe y tiene acceso a un campo que no existe.This example shows what happens if you attempt to use reflection to call a method that does not exist and access a field that does not exist. La aplicación se recupera al detectar MissingMethodException, MissingFieldExceptiony MissingMemberException.The application recovers by catching the MissingMethodException, MissingFieldException, and MissingMemberException.

using namespace System;
using namespace System::Reflection;

ref class App
{
};

int main()
{
    try
    {
        // Attempt to call a static DoSomething method defined in the App class.
        // However, because the App class does not define this method,
        // a MissingMethodException is thrown.
        App::typeid->InvokeMember("DoSomething", BindingFlags::Static |
            BindingFlags::InvokeMethod, nullptr, nullptr, nullptr);
    }
    catch (MissingMethodException^ ex)
    {
        // Show the user that the DoSomething method cannot be called.
        Console::WriteLine("Unable to call the DoSomething method: {0}",
            ex->Message);
    }

    try
    {
        // Attempt to access a static AField field defined in the App class.
        // However, because the App class does not define this field,
        // a MissingFieldException is thrown.
        App::typeid->InvokeMember("AField", BindingFlags::Static |
            BindingFlags::SetField, nullptr, nullptr, gcnew array<Object^>{5});
    }
    catch (MissingFieldException^ ex)
    {
        // Show the user that the AField field cannot be accessed.
        Console::WriteLine("Unable to access the AField field: {0}",
            ex->Message);
    }

    try
    {
        // Attempt to access a static AnotherField field defined in the App class.
        // However, because the App class does not define this field,
        // a MissingFieldException is thrown.
        App::typeid->InvokeMember("AnotherField", BindingFlags::Static |
            BindingFlags::GetField, nullptr, nullptr, nullptr);
    }
    catch (MissingMemberException^ ex)
    {
        // Notice that this code is catching MissingMemberException which is the
        // base class of MissingMethodException and MissingFieldException.
        // Show the user that the AnotherField field cannot be accessed.
        Console::WriteLine("Unable to access the AnotherField field: {0}",
            ex->Message);
    }
}
// This code produces the following output.
//
// Unable to call the DoSomething method: Method 'App.DoSomething' not found.
// Unable to access the AField field: Field 'App.AField' not found.
// Unable to access the AnotherField field: Field 'App.AnotherField' not found.
using System;
using System.Reflection;

public class App
{
    public static void Main()
    {

        try
        {
            // Attempt to call a static DoSomething method defined in the App class.
            // However, because the App class does not define this method,
            // a MissingMethodException is thrown.
            typeof(App).InvokeMember("DoSomething", BindingFlags.Static |
                BindingFlags.InvokeMethod, null, null, null);
        }
        catch (MissingMethodException e)
        {
            // Show the user that the DoSomething method cannot be called.
            Console.WriteLine("Unable to call the DoSomething method: {0}", e.Message);
        }

        try
        {
            // Attempt to access a static AField field defined in the App class.
            // However, because the App class does not define this field,
            // a MissingFieldException is thrown.
            typeof(App).InvokeMember("AField", BindingFlags.Static | BindingFlags.SetField,
                null, null, new Object[] { 5 });
        }
        catch (MissingFieldException e)
        {
         // Show the user that the AField field cannot be accessed.
         Console.WriteLine("Unable to access the AField field: {0}", e.Message);
        }

        try
        {
            // Attempt to access a static AnotherField field defined in the App class.
            // However, because the App class does not define this field,
            // a MissingFieldException is thrown.
            typeof(App).InvokeMember("AnotherField", BindingFlags.Static |
                BindingFlags.GetField, null, null, null);
        }
        catch (MissingMemberException e)
        {
         // Notice that this code is catching MissingMemberException which is the
         // base class of MissingMethodException and MissingFieldException.
         // Show the user that the AnotherField field cannot be accessed.
         Console.WriteLine("Unable to access the AnotherField field: {0}", e.Message);
        }
    }
}
// This code example produces the following output:
//
// Unable to call the DoSomething method: Method 'App.DoSomething' not found.
// Unable to access the AField field: Field 'App.AField' not found.
// Unable to access the AnotherField field: Field 'App.AnotherField' not found.
Imports System.Reflection

Public Class App
    Public Shared Sub Main() 
        Try
            ' Attempt to call a static DoSomething method defined in the App class.
            ' However, because the App class does not define this method, 
            ' a MissingMethodException is thrown.
            GetType(App).InvokeMember("DoSomething", BindingFlags.Static Or BindingFlags.InvokeMethod, _
                                       Nothing, Nothing, Nothing)
        Catch e As MissingMethodException
            ' Show the user that the DoSomething method cannot be called.
            Console.WriteLine("Unable to call the DoSomething method: {0}", e.Message)
        End Try
        Try
            ' Attempt to access a static AField field defined in the App class.
            ' However, because the App class does not define this field, 
            ' a MissingFieldException is thrown.
            GetType(App).InvokeMember("AField", BindingFlags.Static Or BindingFlags.SetField, _
                                       Nothing, Nothing, New [Object]() {5})
        Catch e As MissingFieldException
            ' Show the user that the AField field cannot be accessed.
            Console.WriteLine("Unable to access the AField field: {0}", e.Message)
        End Try
        Try
            ' Attempt to access a static AnotherField field defined in the App class.
            ' However, because the App class does not define this field, 
            ' a MissingFieldException is thrown.
            GetType(App).InvokeMember("AnotherField", BindingFlags.Static Or BindingFlags.GetField, _
                                       Nothing, Nothing, Nothing)
        Catch e As MissingMemberException
            ' Notice that this code is catching MissingMemberException which is the  
            ' base class of MissingMethodException and MissingFieldException.
            ' Show the user that the AnotherField field cannot be accessed.
            Console.WriteLine("Unable to access the AnotherField field: {0}", e.Message)
        End Try
    End Sub 
End Class 
' This code example produces the following output:
'
' Unable to call the DoSomething method: Method 'App.DoSomething' not found.
' Unable to access the AField field: Field 'App.AField' not found.
' Unable to access the AnotherField field: Field 'App.AnotherField' not found.

Comentarios

Normalmente, se genera un error de compilación si el código intenta obtener acceso a un miembro no existente de una clase.Normally a compilation error is generated if code attempts to access a nonexistent member of a class. MissingFieldExceptionestá diseñado para controlar los casos en los que se realiza un intento de obtener acceso de forma dinámica a un campo cambiado de nombre o eliminado de un ensamblado al que no se hace referencia por su nombre seguro.MissingFieldException is designed to handle cases where an attempt is made to dynamically access a renamed or deleted field of an assembly that is not referenced by its strong name. Se MissingFieldException produce cuando el código de un ensamblado dependiente intenta tener acceso a un campo que falta en un ensamblado que se ha modificado.The MissingFieldException is thrown when code in a dependent assembly attempts to access a missing field in an assembly that was modified.

MissingFieldExceptionusa el COR_E_MISSINGFIELD HRESULT, que tiene el valor 0x80131511.MissingFieldException uses the HRESULT COR_E_MISSINGFIELD, that has the value 0x80131511.

Para obtener una lista de valores de propiedad iniciales de una instancia de MissingFieldException, consulte el MissingFieldException constructores.For a list of initial property values for an instance of MissingFieldException, see the MissingFieldException constructors.

Constructores

MissingFieldException()

Inicializa una nueva instancia de la clase MissingFieldException.Initializes a new instance of the MissingFieldException class.

MissingFieldException(SerializationInfo, StreamingContext)

Inicializa una nueva instancia de la clase MissingFieldException con datos serializados.Initializes a new instance of the MissingFieldException class with serialized data.

MissingFieldException(String)

Inicializa una nueva instancia de la clase MissingFieldException con el mensaje de error especificado.Initializes a new instance of the MissingFieldException class with a specified error message.

MissingFieldException(String, Exception)

Inicializa una nueva instancia de la clase MissingFieldException con el mensaje de error especificado y una referencia a la excepción interna que representa la causa de esta excepción.Initializes a new instance of the MissingFieldException class with a specified error message and a reference to the inner exception that is the cause of this exception.

MissingFieldException(String, String)

Inicializa una nueva instancia de la clase MissingFieldException con el nombre de la clase y el nombre del campo que se hayan especificado.Initializes a new instance of the MissingFieldException class with the specified class name and field name.

Campos

ClassName

Contiene el nombre de clase del miembro que falta.Holds the class name of the missing member.

(Heredado de MissingMemberException)
MemberName

Contiene el nombre del miembro que falta.Holds the name of the missing member.

(Heredado de MissingMemberException)
Signature

Contiene la firma del miembro que falta.Holds the signature of the missing member.

(Heredado de MissingMemberException)

Propiedades

Data

Obtiene una colección de pares clave-valor que proporcionan más información definida por el usuario sobre la excepción.Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Heredado de Exception)
HelpLink

Obtiene o establece un vínculo al archivo de ayuda asociado a esta excepción.Gets or sets a link to the help file associated with this exception.

(Heredado de Exception)
HResult

Obtiene o establece HRESULT, un valor numérico codificado que se asigna a una excepción específica.Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Heredado de Exception)
InnerException

Obtiene la instancia Exception que produjo la excepción actual.Gets the Exception instance that caused the current exception.

(Heredado de Exception)
Message

Obtiene la cadena de texto que muestra la firma del campo que no se encuentra, el nombre de la clase y el nombre del campo.Gets the text string showing the signature of the missing field, the class name, and the field name. Esta propiedad es de sólo lectura.This property is read-only.

Source

Devuelve o establece el nombre de la aplicación o del objeto que generó el error.Gets or sets the name of the application or the object that causes the error.

(Heredado de Exception)
StackTrace

Obtiene una representación de cadena de los marcos inmediatos en la pila de llamadas.Gets a string representation of the immediate frames on the call stack.

(Heredado de Exception)
TargetSite

Obtiene el método que produjo la excepción actual.Gets the method that throws the current exception.

(Heredado de Exception)

Métodos

Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

(Heredado de Object)
GetBaseException()

Cuando se reemplaza en una clase derivada, devuelve la clase Exception que representa la causa principal de una o más excepciones posteriores.When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Heredado de Exception)
GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

(Heredado de Object)
GetObjectData(SerializationInfo, StreamingContext)

Establece el objeto SerializationInfo con el nombre de la clase, el nombre del miembro, la firma del miembro que falta e información adicional de la excepción.Sets the SerializationInfo object with the class name, the member name, the signature of the missing member, and additional exception information.

(Heredado de MissingMemberException)
GetType()

Obtiene el tipo de tiempo de ejecución de la instancia actual.Gets the runtime type of the current instance.

(Heredado de Exception)
MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

(Heredado de Object)
ToString()

Crea y devuelve una representación de cadena de la excepción actual.Creates and returns a string representation of the current exception.

(Heredado de Exception)

Eventos

SerializeObjectState

Ocurre cuando una excepción se serializa para crear un objeto de estado de excepción que contenga datos serializados sobre la excepción.Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Heredado de Exception)

Se aplica a

Consulte también: