Exception.Message Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene un mensaje que describe la excepción actual.
public:
virtual property System::String ^ Message { System::String ^ get(); };public virtual string Message { get; }member this.Message : stringPublic Overridable ReadOnly Property Message As StringValor de propiedad
Mensaje de error que explica la razón de la excepción, o cadena vacía ("").
Implementaciones
Ejemplos
En el ejemplo de código siguiente se produce y, a continuación, se detecta una Exception excepción y se muestra el mensaje de texto de la excepción mediante la Message propiedad .
// Example for the Exception::HelpLink, Exception::Source,
// Exception::StackTrace, and Exception::TargetSite properties.
using namespace System;
namespace NDP_UE_CPP
{
// Derive an exception; the constructor sets the HelpLink and
// Source properties.
public ref class LogTableOverflowException: public Exception
{
private:
static String^ overflowMessage = "The log table has overflowed.";
public:
LogTableOverflowException( String^ auxMessage, Exception^ inner )
: Exception( String::Format( "{0} - {1}", overflowMessage, auxMessage ), inner )
{
this->HelpLink = "https://docs.microsoft.com";
this->Source = "Exception_Class_Samples";
}
};
public ref class LogTable
{
public:
LogTable( int numElements )
{
logArea = gcnew array<String^>(numElements);
elemInUse = 0;
}
protected:
array<String^>^logArea;
int elemInUse;
public:
// The AddRecord method throws a derived exception if
// the array bounds exception is caught.
int AddRecord( String^ newRecord )
{
try
{
logArea[ elemInUse ] = newRecord;
return elemInUse++;
}
catch ( Exception^ ex )
{
throw gcnew LogTableOverflowException( String::Format( "Record \"{0}\" was not logged.", newRecord ),ex );
}
}
};
// Create a log table and force an overflow.
void ForceOverflow()
{
LogTable^ log = gcnew LogTable( 4 );
try
{
for ( int count = 1; ; count++ )
{
log->AddRecord( String::Format( "Log record number {0}", count ) );
}
}
catch ( Exception^ ex )
{
Console::WriteLine( "\nMessage ---\n{0}", ex->Message );
Console::WriteLine( "\nHelpLink ---\n{0}", ex->HelpLink );
Console::WriteLine( "\nSource ---\n{0}", ex->Source );
Console::WriteLine( "\nStackTrace ---\n{0}", ex->StackTrace );
Console::WriteLine( "\nTargetSite ---\n{0}", ex->TargetSite->ToString() );
}
}
}
int main()
{
Console::WriteLine( "This example of \n Exception::Message, \n"
" Exception::HelpLink, \n Exception::Source, \n"
" Exception::StackTrace, and \n Exception::"
"TargetSite \ngenerates the following output." );
NDP_UE_CPP::ForceOverflow();
}
/*
This example of
Exception::Message,
Exception::HelpLink,
Exception::Source,
Exception::StackTrace, and
Exception::TargetSite
generates the following output.
Message ---
The log table has overflowed. - Record "Log record number 5" was not logged.
HelpLink ---
https://docs.microsoft.com
Source ---
Exception_Class_Samples
StackTrace ---
at NDP_UE_CPP.LogTable.AddRecord(String newRecord)
at NDP_UE_CPP.ForceOverflow()
TargetSite ---
Int32 AddRecord(System.String)
*/
// Example for the Exception.HelpLink, Exception.Source,
// Exception.StackTrace, and Exception.TargetSite properties.
using System;
namespace NDP_UE_CS
{
// Derive an exception; the constructor sets the HelpLink and
// Source properties.
class LogTableOverflowException : Exception
{
const string overflowMessage = "The log table has overflowed.";
public LogTableOverflowException(
string auxMessage, Exception inner ) :
base( String.Format( "{0} - {1}",
overflowMessage, auxMessage ), inner )
{
this.HelpLink = "https://docs.microsoft.com";
this.Source = "Exception_Class_Samples";
}
}
class LogTable
{
public LogTable( int numElements )
{
logArea = new string[ numElements ];
elemInUse = 0;
}
protected string[ ] logArea;
protected int elemInUse;
// The AddRecord method throws a derived exception if
// the array bounds exception is caught.
public int AddRecord( string newRecord )
{
try
{
logArea[ elemInUse ] = newRecord;
return elemInUse++;
}
catch( Exception e )
{
throw new LogTableOverflowException(
String.Format( "Record \"{0}\" was not logged.",
newRecord ), e );
}
}
}
class OverflowDemo
{
// Create a log table and force an overflow.
public static void Main()
{
LogTable log = new LogTable( 4 );
Console.WriteLine(
"This example of \n Exception.Message, \n" +
" Exception.HelpLink, \n Exception.Source, \n" +
" Exception.StackTrace, and \n Exception." +
"TargetSite \ngenerates the following output." );
try
{
for( int count = 1; ; count++ )
{
log.AddRecord(
String.Format(
"Log record number {0}", count ) );
}
}
catch( Exception ex )
{
Console.WriteLine( "\nMessage ---\n{0}", ex.Message );
Console.WriteLine(
"\nHelpLink ---\n{0}", ex.HelpLink );
Console.WriteLine( "\nSource ---\n{0}", ex.Source );
Console.WriteLine(
"\nStackTrace ---\n{0}", ex.StackTrace );
Console.WriteLine(
"\nTargetSite ---\n{0}", ex.TargetSite );
}
}
}
}
/*
This example of
Exception.Message,
Exception.HelpLink,
Exception.Source,
Exception.StackTrace, and
Exception.TargetSite
generates the following output.
Message ---
The log table has overflowed. - Record "Log record number 5" was not logged.
HelpLink ---
https://docs.microsoft.com
Source ---
Exception_Class_Samples
StackTrace ---
at NDP_UE_CS.LogTable.AddRecord(String newRecord)
at NDP_UE_CS.OverflowDemo.Main()
TargetSite ---
Int32 AddRecord(System.String)
*/
// Example for the Exception.HelpLink, Exception.Source,
// Exception.StackTrace, and Exception.TargetSite properties.
open System
let overflowMessage = "The log table has overflowed."
// Derive an exception; the constructor sets the HelpLink and
// Source properties.
type LogTableOverflowException(auxMessage, inner) as this =
inherit Exception($"%s{overflowMessage} - %s{auxMessage}", inner)
do
this.HelpLink <- "https://docs.microsoft.com"
this.Source <- "Exception_Class_Samples"
type LogTable(numElements) =
let logArea = Array.zeroCreate<string> numElements
let mutable elemInUse = 0
// The AddRecord method throws a derived exception if
// the array bounds exception is caught.
member this.AddRecord(newRecord) =
try
logArea[elemInUse] <- newRecord
elemInUse <- elemInUse + 1
elemInUse - 1
with e ->
raise (LogTableOverflowException($"Record \"{newRecord}\" was not logged.", e) )
// Create a log table and force an overflow.
let log = LogTable 4
printfn
"""This example of
Exception.Message,
Exception.HelpLink,
Exception.Source,
Exception.StackTrace, and
Exception.TargetSite
generates the following output."""
try
for count = 1 to 1000000 do
log.AddRecord $"Log record number {count}"
|> ignore
with ex ->
printfn $"\nMessage ---\n{ex.Message}"
printfn $"\nHelpLink ---\n{ex.HelpLink}"
printfn $"\nSource ---\n{ex.Source}"
printfn $"\nStackTrace ---\n{ex.StackTrace}"
printfn $"\nTargetSite ---\n{ex.TargetSite}"
// This example of
// Exception.Message,
// Exception.HelpLink,
// Exception.Source,
// Exception.StackTrace, and
// Exception.TargetSite
// generates the following output.
// Message ---
// The log table has overflowed. - Record "Log record number 5" was not logged.
// HelpLink ---
// https://docs.microsoft.com
// Source ---
// Exception_Class_Samples
// StackTrace ---
// at NDP_UE_FS.LogTable.AddRecord(String newRecord)
// at <StartupCode$fs>.$NDP_UE_FS.main@()
// TargetSite ---
// Int32 AddRecord(System.String)
' Example for the Exception.HelpLink, Exception.Source,
' Exception.StackTrace, and Exception.TargetSite properties.
Namespace NDP_UE_VB
' Derive an exception; the constructor sets the HelpLink and
' Source properties.
Class LogTableOverflowException
Inherits Exception
Private Const overflowMessage As String = _
"The log table has overflowed."
Public Sub New( auxMessage As String, inner As Exception )
MyBase.New( String.Format( "{0} - {1}", _
overflowMessage, auxMessage ), inner )
Me.HelpLink = "https://docs.microsoft.com"
Me.Source = "Exception_Class_Samples"
End Sub
End Class
Class LogTable
Public Sub New(numElements As Integer)
logArea = New String(numElements) {}
elemInUse = 0
End Sub
Protected logArea() As String
Protected elemInUse As Integer
' The AddRecord method throws a derived exception if
' the array bounds exception is caught.
Public Function AddRecord( newRecord As String ) As Integer
Try
Dim curElement as Integer = elemInUse
logArea( elemInUse ) = newRecord
elemInUse += 1
Return curElement
Catch ex As Exception
Throw New LogTableOverflowException( _
String.Format( "Record ""{0}"" was not logged.", _
newRecord ), ex )
End Try
End Function ' AddRecord
End Class
Module OverflowDemo
' Create a log table and force an overflow.
Sub Main( )
Dim log As New LogTable( 4 )
Console.WriteLine( "This example of " & vbCrLf & _
" Exception.Message, " & vbCrLf & _
" Exception.HelpLink, " & vbCrLf & _
" Exception.Source, " & vbCrLf & _
" Exception.StackTrace, and " & vbCrLf & _
" Exception.TargetSite " & vbCrLf & _
"generates the following output." )
Try
Dim count As Integer = 0
Do
log.AddRecord( _
String.Format( "Log record number {0}", count ) )
count += 1
Loop
Catch ex As Exception
Console.WriteLine( vbCrLf & _
"Message ---" & vbCrLf & ex.Message )
Console.WriteLine( vbCrLf & _
"HelpLink ---" & vbCrLf & ex.HelpLink )
Console.WriteLine( vbCrLf & _
"Source ---" & vbCrLf & ex.Source )
Console.WriteLine( vbCrLf & _
"StackTrace ---" & vbCrLf & ex.StackTrace )
Console.WriteLine( vbCrLf & "TargetSite ---" & _
vbCrLf & ex.TargetSite.ToString( ) )
End Try
End Sub
End Module ' OverflowDemo
End Namespace ' NDP_UE_VB
' This example of
' Exception.Message,
' Exception.HelpLink,
' Exception.Source,
' Exception.StackTrace, and
' Exception.TargetSite
' generates the following output.
'
' Message ---
' The log table has overflowed. - Record "Log record number 5" was not logged.
'
' HelpLink ---
' https://docs.microsoft.com
'
' Source ---
' Exception_Class_Samples
'
' StackTrace ---
' at NDP_UE_VB.LogTable.AddRecord(String newRecord)
' at NDP_UE_VB.OverflowDemo.Main()
'
' TargetSite ---
' Int32 AddRecord(System.String)
Comentarios
Los mensajes de error tienen como destino al desarrollador que controla la excepción. El texto de la Message propiedad debe describir completamente el error y, cuando sea posible, también debe explicar cómo corregir el error. Los controladores de excepciones de nivel superior pueden mostrar el mensaje a los usuarios finales, por lo que debe asegurarse de que es correcto gramaticalmente y que cada frase del mensaje termina con un punto. No use signos de interrogación ni signos de exclamación. Si la aplicación usa mensajes de excepción localizados, debe asegurarse de que se traducen con precisión.
Importante
No revele información confidencial en los mensajes de excepción sin comprobar los permisos adecuados.
El valor de la Message propiedad se incluye en la información devuelta por ToString. La Message propiedad solo se establece al crear un Exceptionobjeto . Si no se proporcionó ningún mensaje al constructor de la instancia actual, el sistema proporciona un mensaje predeterminado que tiene formato mediante la referencia cultural del sistema actual.
Notas a los desarrolladores de herederos
La Message propiedad se invalida en clases que requieren control sobre el contenido o el formato del mensaje. Normalmente, el código de la aplicación accede a esta propiedad cuando necesita mostrar información sobre una excepción detectada.
El mensaje de error debe localizarse.
Se aplica a
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