TypeLoadException Costruttori

Definizione

Inizializza una nuova istanza della classe TypeLoadException.Initializes a new instance of the TypeLoadException class.

Overload

TypeLoadException()

Inizializza una nuova istanza della classe TypeLoadException.Initializes a new instance of the TypeLoadException class.

TypeLoadException(String)

Inizializza una nuova istanza della classe TypeLoadException con un messaggio di errore specificato.Initializes a new instance of the TypeLoadException class with a specified error message.

TypeLoadException(SerializationInfo, StreamingContext)

Inizializza una nuova istanza della classe TypeLoadException con dati serializzati.Initializes a new instance of the TypeLoadException class with serialized data.

TypeLoadException(String, Exception)

Inizializza una nuova istanza della classe TypeLoadException con un messaggio di errore specificato e un riferimento all'eccezione interna che è la causa dell'eccezione corrente.Initializes a new instance of the TypeLoadException class with a specified error message and a reference to the inner exception that is the cause of this exception.

TypeLoadException()

Inizializza una nuova istanza della classe TypeLoadException.Initializes a new instance of the TypeLoadException class.

public:
 TypeLoadException();
public TypeLoadException ();
Public Sub New ()

Commenti

Questo costruttore inizializza la proprietà Message della nuova istanza di in un messaggio fornito dal sistema in cui viene descritto l'errore, ad esempio "si è verificato un errore durante il caricamento di un tipo".This constructor initializes the Message property of the new instance to a system-supplied message that describes the error, such as "A failure has occurred while loading a type." Questo messaggio prende in considerazione le impostazioni cultura correnti del sistema.This message takes into account the current system culture.

Nella tabella seguente vengono illustrati i valori di proprietà iniziali per un'istanza di TypeLoadException.The following table shows the initial property values for an instance of TypeLoadException.

ProprietàProperty ValoreValue
InnerException Riferimento null (Nothing in Visual Basic).A null reference (Nothing in Visual Basic).
Message Stringa localizzata del messaggio di errore.The localized error message string.

TypeLoadException(String)

Inizializza una nuova istanza della classe TypeLoadException con un messaggio di errore specificato.Initializes a new instance of the TypeLoadException class with a specified error message.

public:
 TypeLoadException(System::String ^ message);
public TypeLoadException (string message);
new TypeLoadException : string -> TypeLoadException
Public Sub New (message As String)

Parametri

message
String

Messaggio che descrive l'errore.The message that describes the error.

Esempi

Nell'esempio di codice riportato di seguito viene illustrato il costruttore TypeLoadException(String).The following code example demonstrates the TypeLoadException(String) constructor. Contiene un metodo che genera un TypeLoadException con un messaggio personalizzato e visualizza il messaggio di errore nella console.It contains a method that generates a TypeLoadException with a custom message, and displays the error message to the console.

using namespace System;

class TypeLoadExceptionDemoClass
{
   public:
      static bool GenerateException()
      {
         // Throw a TypeLoadException with a custom message.
         throw gcnew TypeLoadException("This is a custom TypeLoadException error message.");
      }
};

int main()
{
   try {
      // Call a method that throws an exception.  
      TypeLoadExceptionDemoClass::GenerateException();
   }
   catch ( TypeLoadException^ e ) {
      Console::WriteLine("TypeLoadException:\n   {0}", e->Message);
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception: \n\tError Message = {0}", e->Message );
   }

}
// The example displays the following output:
//       TypeLoadException:
//          This is a custom TypeLoadException error message.
using System;

public class Example
{
   public static void Main() 
   {
      try {
         // Call a method that throws an exception.
         TypeLoadExceptionDemoClass.GenerateException();
      }  
      catch (TypeLoadException e) {
         Console.WriteLine("TypeLoadException:\n   {0}", e.Message);
      }
   }
}

class TypeLoadExceptionDemoClass
{ 
   public static bool GenerateException() 
   {
      // Throw a TypeLoadException with a custom defined message.
      throw new TypeLoadException("This is a custom TypeLoadException error message.");
   }
}
// The example displays the following output:
//       TypeLoadException:
//          This is a custom TypeLoadException error message.
Public Class Example
   Public Shared Sub Main()
      Try
         ' Call a method that throws an exception.
         TypeLoadExceptionDemoClass.GenerateException()
      Catch e As TypeLoadException
         Console.WriteLine("TypeLoadException:{0}   {1}", vbCrLf, e.Message)
      End Try
   End Sub 
End Class 

Class TypeLoadExceptionDemoClass
   Public Shared Function GenerateException() As Boolean
      ' Throw a TypeLoadException with a custom message.
      Throw New TypeLoadException("This is a custom TypeLoadException error message.")
   End Function 
End Class 
' The example displays the following output:
'       TypeLoadException:
'          This is a custom TypeLoadException error message.

Commenti

Il contenuto del parametro di message deve essere comprensibile all'utente.The content of the message parameter should be understandable to the user. Il chiamante di questo costruttore è necessario per assicurarsi che questa stringa sia stata localizzata per le impostazioni cultura correnti del sistema.The caller of this constructor is required to ensure that this string has been localized for the current system culture.

Nella tabella seguente vengono illustrati i valori di proprietà iniziali per un'istanza di TypeLoadException.The following table shows the initial property values for an instance of TypeLoadException.

ProprietàProperty ValoreValue
InnerException Riferimento null (Nothing in Visual Basic).A null reference (Nothing in Visual Basic).
Message Stringa del messaggio di errore.The error message string.

TypeLoadException(SerializationInfo, StreamingContext)

Inizializza una nuova istanza della classe TypeLoadException con dati serializzati.Initializes a new instance of the TypeLoadException class with serialized data.

protected:
 TypeLoadException(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);
protected TypeLoadException (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
new TypeLoadException : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> TypeLoadException
Protected Sub New (info As SerializationInfo, context As StreamingContext)

Parametri

info
SerializationInfo

Oggetto contenente i dati dell'oggetto serializzato.The object that holds the serialized object data.

context
StreamingContext

Informazioni contestuali sull'origine o sulla destinazione.The contextual information about the source or destination.

Eccezioni

L'oggetto info è null.The info object is null.

Esempi

Nell'esempio seguente viene generata un'eccezione e vengono serializzati i dati dell'eccezione in un file e quindi viene ricostituita l'eccezione.The following example generates an exception, and serializes the exception data to a file, and then reconstitutes the exception. Per eseguire questo esempio di codice, è necessario specificare il nome completo dell'assembly.For this code example to run, you must provide the fully qualified assembly name. Per informazioni su come ottenere il nome completo dell'assembly, vedere nomi degli assembly.For information about how to obtain the fully qualified assembly name, see Assembly Names.

#using <System.Runtime.Serialization.Formatters.Soap.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::Runtime::Serialization;
using namespace System::Runtime::Serialization::Formatters::Soap;
using namespace System::IO;

// This class overrides the GetObjectData method and initializes
// its data with current time. 

[Serializable]
public ref class MyTypeLoadExceptionChild: public TypeLoadException
{
public:
   System::DateTime ErrorDateTime;
   MyTypeLoadExceptionChild()
   {
      ErrorDateTime = DateTime::Now;
   }

   MyTypeLoadExceptionChild( DateTime myDateTime )
   {
      ErrorDateTime = myDateTime;
   }


protected:
   MyTypeLoadExceptionChild( SerializationInfo^ sInfo, StreamingContext * sContext )
   {
      
      // Reconstitute the deserialized information into the instance.
      ErrorDateTime = sInfo->GetDateTime( "ErrorDate" );
   }


public:
   void GetObjectData( SerializationInfo^ sInfo, StreamingContext * sContext )
   {
      
      // Add a value to the Serialization information.
      sInfo->AddValue( "ErrorDate", ErrorDateTime );
   }

};

int main()
{
   
   // Load the mscorlib assembly and get a reference to it.
   // You must supply the fully qualified assembly name for mscorlib.dll here.
   Assembly^ myAssembly = Assembly::Load( "Assembly text name, Version, Culture, PublicKeyToken" );
   try
   {
      Console::WriteLine( "Attempting to load a type not present in the assembly 'mscorlib'" );
      
      // This loading of invalid type raises a TypeLoadException
      Type^ myType = myAssembly->GetType( "System::NonExistentType", true );
   }
   catch ( TypeLoadException^ ) 
   {
      
      // Serialize the exception to disk and reconstitute it back again.
      try
      {
         System::DateTime ErrorDatetime = DateTime::Now;
         Console::WriteLine( "A TypeLoadException has been raised." );
         
         // Create MyTypeLoadException instance with current time.
         MyTypeLoadExceptionChild^ myTypeLoadExceptionChild = gcnew MyTypeLoadExceptionChild( ErrorDatetime );
         IFormatter^ myFormatter = gcnew SoapFormatter;
         Stream^ myFileStream = gcnew FileStream( "typeload.xml",FileMode::Create,FileAccess::Write,FileShare::None );
         Console::WriteLine( "Serializing the TypeLoadException with DateTime as {0}", ErrorDatetime );
         
         // Serialize the MyTypeLoadException instance to a file.
         myFormatter->Serialize( myFileStream, myTypeLoadExceptionChild );
         myFileStream->Close();
         Console::WriteLine( "Deserializing the Exception." );
         myFileStream = gcnew FileStream( "typeload.xml",FileMode::Open,FileAccess::Read,FileShare::None );
         
         // Deserialize and reconstitute the instance from file.
         myTypeLoadExceptionChild = safe_cast<MyTypeLoadExceptionChild^>(myFormatter->Deserialize( myFileStream ));
         myFileStream->Close();
         Console::WriteLine( "Deserialized exception has ErrorDateTime = {0}", myTypeLoadExceptionChild->ErrorDateTime );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Exception : {0}", e->Message );
      }

   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception : {0}", e->Message );
   }

}


using System;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Soap; 
using System.Security.Permissions;
using System.IO;

class GetObjectDataDemo
{
   public static void Main()
   {
      // Get a reference to the assembly mscorlib.dll, which is always
      // loaded. (System.String is defined in mscorlib.)
      Assembly mscorlib = typeof(string).Assembly;

      try
      {
         Console.WriteLine ("Attempting to load a type not present in the assembly 'mscorlib'");
         // This loading of invalid type raises a TypeLoadException
         Type myType = mscorlib.GetType("System.NonExistentType", true);
      }         
      catch (TypeLoadException)
      {
         // Serialize the exception to disk and reconstitute it.
         System.DateTime ErrorDatetime = DateTime.Now;
         Console.WriteLine("A TypeLoadException has been raised.");

         // Create MyTypeLoadException instance with current time.
         MyTypeLoadException myException = new MyTypeLoadException(ErrorDatetime);
         IFormatter myFormatter = new SoapFormatter();
         Stream myFileStream = new FileStream("typeload.xml", FileMode.Create, FileAccess.Write, FileShare.None);
         Console.WriteLine("Serializing the TypeLoadException with DateTime as " + ErrorDatetime);

         // Serialize the MyTypeLoadException instance to a file.
         myFormatter.Serialize(myFileStream, myException);
         myFileStream.Close();

         Console.WriteLine("Deserializing the Exception.");
         myFileStream = new FileStream("typeload.xml", FileMode.Open, FileAccess.Read, FileShare.None);

         // Deserialize and reconstitute the instance from file.
         myException = (MyTypeLoadException) myFormatter.Deserialize(myFileStream);
         myFileStream.Close();
         Console.WriteLine("Deserialized exception has ErrorDateTime = " + myException.ErrorDateTime);
      }
   }
}

// This class overrides the GetObjectData method and initializes
// its data with current time. 

[Serializable]
public class MyTypeLoadException : TypeLoadException 
{
   private System.DateTime _errorDateTime = DateTime.Now;
   public DateTime ErrorDateTime { get { return _errorDateTime; }}

   public MyTypeLoadException(DateTime myDateTime) 
   {
      _errorDateTime = myDateTime;
   }

   protected MyTypeLoadException(SerializationInfo sInfo, StreamingContext sContext) 
       : base(sInfo, sContext)
   {
      // Reconstitute the deserialized information into the instance.
      _errorDateTime = sInfo.GetDateTime("ErrorDate");
   }

   // GetObjectData overrides must always have a demand for SerializationFormatter.
   [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true)]
   public override void GetObjectData(SerializationInfo sInfo, StreamingContext sContext) 
   {
      base.GetObjectData(sInfo, sContext);
      // Add a value to the Serialization information.
      sInfo.AddValue("ErrorDate", ErrorDateTime);
   }
}
Imports System.Reflection
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Soap
Imports System.Security.Permissions
Imports System.IO

Class GetObjectDataDemo

   Public Shared Sub Main()
      ' Get a reference to the assembly mscorlib.dll, which is always
      ' loaded. (System.String is defined in mscorlib.)
      Dim tString As Type = GetType(String)
      Dim mscorlib As [Assembly] = tString.Assembly

      Try
         Console.WriteLine("Attempting to load a type not present in the assembly 'mscorlib'")
         ' This loading of invalid type raises a TypeLoadException
         Dim myType As Type = mscorlib.GetType("System.NonExistentType", True)
      Catch
         ' Serialize the exception to disk and reconstitute it.
         Dim ErrorDatetime as System.DateTime = DateTime.Now
         Console.WriteLine("A TypeLoadException has been raised.")

         ' Create MyTypeLoadException instance with current time.
         Dim myException As new MyTypeLoadException(ErrorDatetime)
         Dim myFormatter as IFormatter  = new SoapFormatter()
         Dim myFileStream as Stream 
         myFileStream = New FileStream("typeload.xml", FileMode.Create, FileAccess.Write, FileShare.None)
         Console.WriteLine("Serializing the TypeLoadException with DateTime as " _
             & ErrorDatetime.ToString())

         ' Serialize the MyTypeLoadException instance to a file.
         myFormatter.Serialize(myFileStream, myException)
         myFileStream.Close()

         Console.WriteLine("Deserializing the Exception.")
         myFileStream = New FileStream("typeload.xml", FileMode.Open, FileAccess.Read, FileShare.None)

         ' Deserialize and reconstitute the instance from file.
         myException = CType(myFormatter.Deserialize(myFileStream), MyTypeLoadException)
         myFileStream.Close()
         Console.WriteLine("Deserialized exception has ErrorDateTime = " + myException.ErrorDateTime.ToString())
      End Try
   End Sub
End Class

' This class overrides the GetObjectData method and initializes
' its data with current time. 
<Serializable()> _
Public Class MyTypeLoadException
   Inherits TypeLoadException

   Private _errorDateTime As System.DateTime = DateTime.Now
   Public ReadOnly Property ErrorDateTime As DateTime
      Get
         Return _errorDateTime
      End Get
   End Property

   Public Sub New(myDateTime As DateTime)
      _errorDateTime = myDateTime
   End Sub

   Protected Sub New(sInfo As SerializationInfo, sContext As StreamingContext)
      MyBase.New(sInfo, sContext)
      ' Reconstitute the deserialized information into the instance.
      _errorDateTime = sInfo.GetDateTime("ErrorDate")
   End Sub

   ' GetObjectData overrides must always have a demand for SerializationFormatter.
   <SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter:=true)> _
   Public Overrides Sub GetObjectData(sInfo As SerializationInfo, sContext As StreamingContext)
      MyBase.GetObjectData(sInfo, sContext)
      ' Add a value to the Serialization information.
      sInfo.AddValue("ErrorDate", ErrorDateTime)
   End Sub

End Class

Commenti

Questo costruttore viene chiamato durante la deserializzazione per ricostituire l'oggetto dell'eccezione trasmesso tramite un flusso.This constructor is called during deserialization to reconstitute the exception object transmitted over a stream. Per altre informazioni, vedere serializzazione SOAP e XML.For more information, see XML and SOAP Serialization.

Vedi anche

TypeLoadException(String, Exception)

Inizializza una nuova istanza della classe TypeLoadException con un messaggio di errore specificato e un riferimento all'eccezione interna che è la causa dell'eccezione corrente.Initializes a new instance of the TypeLoadException class with a specified error message and a reference to the inner exception that is the cause of this exception.

public:
 TypeLoadException(System::String ^ message, Exception ^ inner);
public TypeLoadException (string message, Exception inner);
new TypeLoadException : string * Exception -> TypeLoadException
Public Sub New (message As String, inner As Exception)

Parametri

message
String

Messaggio di errore in cui viene indicato il motivo dell'eccezione.The error message that explains the reason for the exception.

inner
Exception

Eccezione che ha causato l'eccezione corrente.The exception that is the cause of the current exception. Se il parametro inner non è null, l'eccezione corrente viene generata in un blocco catch in cui viene gestita l'eccezione interna.If the inner parameter is not null, the current exception is raised in a catch block that handles the inner exception.

Esempi

Nell'esempio di codice riportato di seguito viene illustrato il costruttore TypeLoadException(String, Exception).The following code example demonstrates the TypeLoadException(String, Exception) constructor. Contiene un metodo che genera un TypeLoadException, intercetta tale eccezione e genera un nuovo TypeLoadException con un messaggio personalizzato, inclusa la TypeLoadException originale come eccezione interna.It contains a method that generates a TypeLoadException, catches that exception, and throws a new TypeLoadException with a custom message, including the original TypeLoadException as the inner exception.

using namespace System;
using namespace System::Runtime::InteropServices;
ref class TypeLoadExceptionDemoClass
{
public:

   // A call to this method will raise a TypeLoadException.

   [DllImport("NonExistentDLL.DLL",EntryPoint="MethodNotExists")]
   static void NonExistentMethod();
   static void GenerateException()
   {
      try
      {
         NonExistentMethod();
      }
      catch ( TypeLoadException^ e ) 
      {
         
         // Rethrow exception with the exception as inner exception
         throw gcnew TypeLoadException( "This exception was raised due to a call to an invalid method.",e );
      }

   }

};

int main()
{
   Console::WriteLine( "Calling a method in a non-existent DLL which triggers a TypeLoadException." );
   try
   {
      TypeLoadExceptionDemoClass::GenerateException();
   }
   catch ( TypeLoadException^ e ) 
   {
      Console::WriteLine( "TypeLoadException: \n\tError Message = {0}", e->Message );
      Console::WriteLine( "TypeLoadException: \n\tInnerException Message = {0}", e->InnerException->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception: \n\tError Message = {0}", e->Message );
   }

}


using System;
using System.Runtime.InteropServices;

public class TypeLoadException_Constructor3
{
   public static void Main() 
   {
      Console.WriteLine("Calling a method in a non-existent DLL which triggers a TypeLoadException.");
      try 
      {
         TypeLoadExceptionDemoClass.GenerateException();
      }  
      catch (TypeLoadException e)
      {
         Console.WriteLine ("TypeLoadException: \n\tError Message = " + e.Message);
         Console.WriteLine ("TypeLoadException: \n\tInnerException Message = " + e.InnerException.Message );
      }  
      catch (Exception e)
      {
         Console.WriteLine ("Exception: \n\tError Message = " + e.Message);
      }
   }
}

class TypeLoadExceptionDemoClass
{ 
   // A call to this method will raise a TypeLoadException.
   [DllImport("NonExistentDLL.DLL", EntryPoint="MethodNotExists")]
   public static extern void NonExistentMethod();

   public static void GenerateException() 
   {
      try 
      {
         NonExistentMethod();
      }
      catch (TypeLoadException e) 
      {
         // Rethrow exception with the exception as inner exception
         throw new TypeLoadException("This exception was raised due to a call to an invalid method.", e);
      }
   }
}
Imports System.Runtime.InteropServices

Public Class TypeLoadException_Constructor3
   Public Shared Sub Main()
      Console.WriteLine("Calling a method in a non-existent DLL which triggers a TypeLoadException.")
      Try
         TypeLoadExceptionDemoClass.GenerateException()
      Catch e As TypeLoadException
         Console.WriteLine(("TypeLoadException: " + ControlChars.Cr + ControlChars.Tab + "Error Message = " + e.Message))
         Console.WriteLine(("TypeLoadException: " + ControlChars.Cr + ControlChars.Tab + "InnerException Message = " + e.InnerException.Message))
      Catch e As Exception
         Console.WriteLine(("Exception: " + ControlChars.Cr + ControlChars.Tab + "Error Message = " + e.Message))
      End Try
   End Sub
End Class

Class TypeLoadExceptionDemoClass
   ' A call to this method will raise a TypeLoadException.
   Public Declare Sub NonExistentMethod Lib "NonExistentDLL.DLL" Alias "MethodNotExists" ()

   Public Shared Sub GenerateException()
      Try
         NonExistentMethod()
      Catch e As TypeLoadException
         ' Rethrow exception with the exception as inner exception
         Throw New TypeLoadException("This exception was raised due to a call to an invalid method.", e)
      End Try
   End Sub
End Class

Commenti

Un'eccezione generata come risultato diretto di un'eccezione precedente può includere un riferimento all'eccezione precedente nella proprietà InnerException.An exception that is thrown as a direct result of a previous exception can include a reference to the previous exception in the InnerException property. La proprietà InnerException restituisce lo stesso valore passato al costruttore oppure null nel caso in cui la proprietà InnerException non fornisca il valore di eccezione interna al costruttore.The InnerException property returns the same value that is passed into the constructor, or null if the InnerException property does not supply the inner exception value to the constructor.

Nella tabella seguente vengono illustrati i valori di proprietà iniziali per un'istanza di TypeLoadException.The following table shows the initial property values for an instance of TypeLoadException.

ProprietàProperty ValoreValue
InnerException Riferimento all'eccezione interna.The inner exception reference.
Message Stringa del messaggio di errore.The error message string.

Vedi anche

Si applica a