MissingMethodException Classe

Definição

A exceção que é gerada quando há uma tentativa de acessar dinamicamente um método que não existe.The exception that is thrown when there is an attempt to dynamically access a method that does not exist.

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

Exemplos

Este exemplo mostra o que acontece se você tentar usar a reflexão para chamar um método que não existe e acessar 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 ao capturar o, MissingMethodException MissingFieldExceptiono e MissingMemberExceptiono.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.

Comentários

Normalmente, um erro de compilação é gerado se o código tenta acessar um método inexistente de uma classe.Normally a compilation error is generated if code attempts to access a nonexistent method of a class. MissingMethodExceptionfoi projetado para lidar com casos em que é feita uma tentativa de acessar dinamicamente um método renomeado ou excluído de um assembly que não é referenciado por seu nome forte.MissingMethodException is designed to handle cases where an attempt is made to dynamically access a renamed or deleted method of an assembly that is not referenced by its strong name. MissingMethodExceptioné gerado quando o código em um assembly dependente tenta acessar um método ausente em um assembly que foi modificado.MissingMethodException is thrown when code in a dependent assembly attempts to access a missing method in an assembly that was modified.

MissingMethodExceptionusa o HRESULT COR_E_MISSINGMETHOD, que tem o valor 0x80131513.MissingMethodException uses the HRESULT COR_E_MISSINGMETHOD, that has the value 0x80131513.

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

Observação

Essa exceção não está incluída no .net para aplicativos da Windows Store ou na biblioteca de classes portátil, mas é lançada por alguns membros que estão.This exception is not included in .NET for Windows Store apps or the Portable Class Library, but it is thrown by some members that are. Para capturar a exceção nesse caso, escreva uma catch instrução para MissingMemberException em vez disso.To catch the exception in that case, write a catch statement for MissingMemberException instead.

Construtores

MissingMethodException()

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

MissingMethodException(SerializationInfo, StreamingContext)

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

MissingMethodException(String)

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

MissingMethodException(String, Exception)

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

MissingMethodException(String, String)

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

Campos

ClassName

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

(Herdado de MissingMemberException)
MemberName

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

(Herdado de MissingMemberException)
Signature

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

(Herdado de MissingMemberException)

Propriedades

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.

(Herdado de Exception)
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.

(Herdado de Exception)
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.

(Herdado de Exception)
InnerException

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

(Herdado de Exception)
Message

Obtém a cadeia de caracteres de texto que mostra o nome de classe, o nome do método e a assinatura do método ausente.Gets the text string showing the class name, the method name, and the signature of the missing method. Esta propriedade é somente para leitura.This property is read-only.

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.

(Herdado de Exception)
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.

(Herdado de Exception)
TargetSite

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

(Herdado de Exception)

Métodos

Equals(Object)

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

(Herdado de Object)
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.

(Herdado de Exception)
GetHashCode()

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

(Herdado de Object)
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.

(Herdado de MissingMemberException)
GetType()

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

(Herdado de Exception)
MemberwiseClone()

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

(Herdado de Object)
ToString()

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

(Herdado de Exception)

Eventos

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.

(Herdado de Exception)

Aplica-se a

Veja também