Exception.Message Özellik

Tanım

Ad Alanı:

System

Bütünleştirilmiş Kod:

System.Runtime.dll

Kaynak:

Exception.cs

Geçerli özel durumu açıklayan bir ileti alır.

public:
 virtual property System::String ^ Message { System::String ^ get(); };

public virtual string Message { get; }

member this.Message : string

Public Overridable ReadOnly Property Message As String

Özellik Değeri

String

Özel durumun nedenini veya boş bir dizeyi ("") açıklayan hata iletisi.

Örnekler

Aşağıdaki kod örneği bir Exception özel durum oluşturup yakalar ve özelliğini kullanarak Message özel durumun kısa iletisini görüntüler.

// 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://learn.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://learn.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://learn.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://learn.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://learn.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://learn.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://learn.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://learn.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)

Açıklamalar

Hata iletileri özel durumu işleyen geliştiriciyi hedefler. özelliğinin Message metni hatayı tamamen açıklamalı ve mümkün olduğunda hatanın nasıl düzeltilmesi gerektiğini de açıklamalıdır. Üst düzey özel durum işleyicileri iletiyi son kullanıcılara gösterebilir, bu nedenle iletinin dil bilgisi açısından doğru olduğundan ve iletinin her cümlesinin noktayla bitdiğinden emin olmanız gerekir. Soru işaretlerini veya ünlem işaretlerini kullanmayın. Uygulamanız yerelleştirilmiş özel durum iletileri kullanıyorsa, bunların doğru çevrildiğinden emin olmanız gerekir.

Önemli

Özel durum iletilerinde uygun izinleri denetlemeden hassas bilgileri açıklamayın.

özelliğinin Message değeri tarafından ToStringdöndürülen bilgilere eklenir. Message özelliği yalnızca oluşturulurken Exceptionayarlanır. Geçerli örnek için oluşturucuya hiçbir ileti sağlanmadıysa, sistem geçerli sistem kültürü kullanılarak biçimlendirilmiş bir varsayılan ileti sağlar.

Devralanlara Notlar

özelliği Message , ileti içeriği veya biçimi üzerinde denetim gerektiren sınıflarda geçersiz kılınmış. Uygulama kodu genellikle yakalanan bir özel durumla ilgili bilgileri görüntülemesi gerektiğinde bu özelliğe erişir.

Hata iletisi yerelleştirilmiş olmalıdır.