MissingMemberException MissingMemberException MissingMemberException MissingMemberException Class

Definição

A exceção gerada quando há uma tentativa de acessar dinamicamente um membro de classe que não existe ou que não está declarado como público.The exception that is thrown when there is an attempt to dynamically access a class member that does not exist or that is not declared as public. Se um membro em uma biblioteca de classes tiver sido removido ou renomeado, recompile todos os assemblies referenciam essa biblioteca.If a member in a class library has been removed or renamed, recompile any assemblies that reference that library.

public ref class MissingMemberException : MemberAccessException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class MissingMemberException : MemberAccessException
type MissingMemberException = class
    inherit MemberAccessException
    interface ISerializable
Public Class MissingMemberException
Inherits MemberAccessException
Herança
Derivado
Atributos
Implementações

Exemplos

Este exemplo mostra o que acontece se você tentar usar a reflexão para chamar um método que não existe e o acesso um campo que não 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. O aplicativo recupera capturando as MissingMethodException, MissingFieldException, e 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
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.

Comentários

Normalmente, um erro de compilação é gerado se o código tenta acessar um membro não existente de uma classe.Normally a compilation error is generated if the code attempts to access a nonexistent member of a class. MissingMemberException foi projetado para lidar com casos em que um campo ou um método é excluído ou renomeado em um assembly e a alteração não será refletida em um segundo assembly.MissingMemberException is designed to handle cases where a field or a method is deleted or renamed in one assembly and the change is not reflected in a second assembly. No tempo de execução MissingMemberException será gerada quando o código no segundo conjunto tenta acessar o membro ausente no assembly primeiro.At runtime, MissingMemberException will be thrown when the code in the second assembly attempts to access the missing member in the first assembly.

MissingMemberException é a classe base para MissingFieldException e MissingMethodException.MissingMemberException is the base class for MissingFieldException and MissingMethodException. Em geral é melhor usar uma das classes derivadas da MissingMemberException para indicar com mais precisão a natureza exata do erro.In general it is better to use one of the derived classes of MissingMemberException to more precisely indicate the exact nature of the error. Gerar um MissingMemberException se você só estiver interessado em capturar o caso geral de um erro de membro ausente.Throw a MissingMemberException if you are only interested in capturing the general case of a missing member error.

MissingMemberException usa o HRESULT COR_E_MISSINGMEMBER, que tem o valor 0x80131512.MissingMemberException uses the HRESULT COR_E_MISSINGMEMBER, that has the value 0x80131512.

Para obter uma lista de valores de propriedade inicial para uma instância do MissingMemberException, consulte o MissingMemberException construtores.For a list of initial property values for an instance of MissingMemberException, see the MissingMemberException constructors.

Construtores

MissingMemberException() MissingMemberException() MissingMemberException() MissingMemberException()

Inicializa uma nova instância da classe MissingMemberException.Initializes a new instance of the MissingMemberException class.

MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext)

Inicializa uma nova instância da classe MissingMemberException com dados serializados.Initializes a new instance of the MissingMemberException class with serialized data.

MissingMemberException(String) MissingMemberException(String) MissingMemberException(String) MissingMemberException(String)

Inicializa uma nova instância da classe MissingMemberException com uma mensagem de erro especificada.Initializes a new instance of the MissingMemberException class with a specified error message.

MissingMemberException(String, Exception) MissingMemberException(String, Exception) MissingMemberException(String, Exception) MissingMemberException(String, Exception)

Inicializa uma nova instância da classe MissingMemberException com uma mensagem de erro especificada e uma referência à exceção interna que é a causa raiz da exceção.Initializes a new instance of the MissingMemberException class with a specified error message and a reference to the inner exception that is the root cause of this exception.

MissingMemberException(String, String) MissingMemberException(String, String) MissingMemberException(String, String) MissingMemberException(String, String)

Inicializa uma nova instância da classe MissingMemberException com o nome de classe e o nome de membro especificados.Initializes a new instance of the MissingMemberException class with the specified class name and member name.

Campos

ClassName ClassName ClassName ClassName

Contém o nome de classe do membro ausente.Holds the class name of the missing member.

MemberName MemberName MemberName MemberName

Contém o nome do membro ausente.Holds the name of the missing member.

Signature Signature Signature Signature

Contém a assinatura do membro ausente.Holds the signature of the missing member.

Propriedades

Data Data Data Data

Obtém uma coleção de pares de chave/valor que fornecem informações adicionais definidas pelo usuário sobre a exceção.Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink HelpLink HelpLink HelpLink

Obtém ou define um link para o arquivo de ajuda associado a essa exceção.Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult HResult HResult HResult

Obtém ou define HRESULT, um valor numérico codificado que é atribuído a uma exceção específica.Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException InnerException InnerException InnerException

Obtém a instância Exception que causou a exceção atual.Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message Message Message Message

Obtém a cadeia de caracteres de texto que mostra o nome de classe, o nome do membro e a assinatura do membro ausente.Gets the text string showing the class name, the member name, and the signature of the missing member.

Source Source Source Source

Obtém ou define o nome do aplicativo ou objeto que causa o erro.Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace StackTrace StackTrace StackTrace

Obtém uma representação de cadeia de caracteres de quadros imediatos na pilha de chamadas.Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite TargetSite TargetSite TargetSite

Obtém o método que gerou a exceção atual.Gets the method that throws the current exception.

(Inherited from Exception)

Métodos

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina se o objeto especificado é igual ao objeto atual.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetBaseException() GetBaseException() GetBaseException() GetBaseException()

Quando substituído em uma classe derivada, retorna a Exception que é a causa raiz de uma ou mais exceções subsequentes.When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Inherited from Exception)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serve como a função de hash padrão.Serves as the default hash function.

(Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext)

Define o objeto SerializationInfo com o nome de classe, o nome do membro, a assinatura do membro ausente e informações adicionais de exceção.Sets the SerializationInfo object with the class name, the member name, the signature of the missing member, and additional exception information.

GetType() GetType() GetType() GetType()

Obtém o tipo de tempo de execução da instância atual.Gets the runtime type of the current instance.

(Inherited from Exception)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Cria uma cópia superficial do Object atual.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Cria e retorna uma representação de cadeia de caracteres da exceção atual.Creates and returns a string representation of the current exception.

(Inherited from Exception)

Eventos

SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState

Ocorre quando uma exceção é serializada para criar um objeto de estado de exceção que contém dados serializados sobre a exceção.Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

Aplica-se a

Veja também