Exception.HResult Properti

Definisi

Ruang nama:

System

Rakitan:

netstandard.dll, System.Runtime.dll

Sumber:

Exception.cs

Mendapatkan atau mengatur HRESULT, nilai numerik berkode yang ditetapkan ke pengecualian tertentu.

public:
 property int HResult { int get(); void set(int value); };

public int HResult { get; set; }

member this.HResult : int with get, set

Public Property HResult As Integer

Nilai Properti

Int32

Nilai HRESULT.

Contoh

Contoh kode berikut mendefinisikan kelas turunan Exception yang mengatur HResult properti ke nilai kustom dalam konstruktornya.

// Example for the Exception.HResult property.
using System;

namespace NDP_UE_CS
{
    // Create the derived exception class.
    class SecondLevelException : Exception
    {
        const int SecondLevelHResult = unchecked( (int)0x81234567 );

        // Set HResult for this exception, and include it in
        // the exception message.
        public SecondLevelException( string message, Exception inner ) :
            base( string.Format( "(HRESULT:0x{1:X8}) {0}",
                message, SecondLevelHResult ), inner )
        {
            HResult = SecondLevelHResult;
        }
    }

    class HResultDemo
    {
        public static void Main()
        {
            // This function forces a division by 0 and throws
            // a second exception.
            try
            {
                try
                {
                    int  zero = 0;
                    int  ecks = 1 / zero;
                }
                catch( Exception ex )
                {
                    throw new SecondLevelException(
                        "Forced a division by 0 and threw " +
                        "a second exception.", ex );
                }
            }
            catch( Exception ex )
            {
                Console.WriteLine( ex.ToString( ) );
            }
        }
    }
}

/*
This example of Exception.HResult generates the following output.

NDP_UE_CS.SecondLevelException: (HRESULT:0x81234567) Forced a division by 0 and
 threw a second exception. ---> System.DivideByZeroException: Attempted to divi
de by zero.
   at NDP_UE_CS.HResultDemo.Main()
   --- End of inner exception stack trace ---
   at NDP_UE_CS.HResultDemo.Main()
*/

// Example for the Exception.HResult property.
open System

let secondLevelHResult = 0x81234567

// Create the derived exception class.
// Set HResult for this exception, and include it in the exception message.
type SecondLevelException(message, inner) as this =
    inherit Exception($"(HRESULT:0x{secondLevelHResult:X8}) %s{message}", inner)
    do
        this.HResult <- secondLevelHResult

// The following forces a division by 0 and throws a second exception.
try
    try
        let zero = 0
        let ecks = 1 / zero
        ()
    with ex ->
        raise (SecondLevelException("Forced a division by 0 and threw a second exception.", ex) )
with ex ->
    printfn $"{ex}"

// This example of Exception.HResult generates the following output.
//
// NDP_UE_FS+SecondLevelException: (HRESULT:0x81234567) Forced a division by 0 and
//  threw a second exception. ---> System.DivideByZeroException: Attempted to divi
// de by zero.
//    at <StartupCode$fs>.$NDP_UE_FS.main@()
//    --- End of inner exception stack trace ---
//    at <StartupCode$fs>.$NDP_UE_FS.main@()

' Example for the Exception.HResult property.
Namespace NDP_UE_VB

    ' Create the derived exception class.
    Class SecondLevelException
        Inherits Exception

        Private Const SecondLevelHResult As Integer = &H81234567
       
        ' Set HResult for this exception, and include it in 
        ' the exception message.
        Public Sub New(message As String, inner As Exception)

            MyBase.New( String.Format( "(HRESULT:0x{1:X8}) {0}", _
                message, SecondLevelHResult ), inner )
            HResult = SecondLevelHResult
        End Sub
    End Class

    Module HResultDemo
       
        Sub Main()
            ' This function forces a division by 0 and throws 
            ' a second exception.
            Try
                Try
                    Dim zero As Integer = 0
                    Dim ecks As Integer = 1 \ zero

                Catch ex As Exception
                    Throw New SecondLevelException( _
                        "Forced a division by 0 and threw " & _
                        "a second exception.", ex )
                End Try
              
            Catch ex As Exception
                Console.WriteLine( ex.ToString( ) )
            End Try
        End Sub

    End Module ' HResultDemo
End Namespace ' NDP_UE_VB

' This example of Exception.HResult generates the following output.
' 
' NDP_UE_VB.SecondLevelException: (HRESULT:0x81234567) Forced a division by 0 a
' nd threw a second exception. ---> System.DivideByZeroException: Attempted to
' divide by zero.
'    at NDP_UE_VB.HResultDemo.Main()
'    --- End of inner exception stack trace ---
'    at NDP_UE_VB.HResultDemo.Main()

Keterangan

HRESULT adalah nilai 32-bit, dibagi menjadi tiga bidang berbeda: kode tingkat keparahan, kode fasilitas, dan kode kesalahan. Kode tingkat keparahan menunjukkan apakah nilai pengembalian mewakili informasi, peringatan, atau kesalahan. Kode fasilitas mengidentifikasi area sistem yang bertanggung jawab atas kesalahan. Kode kesalahan adalah angka unik yang ditetapkan untuk mewakili pengecualian. Setiap pengecualian dipetakan ke HRESULT yang berbeda. Ketika kode terkelola melemparkan pengecualian, runtime meneruskan HRESULT ke klien COM. Ketika kode yang tidak dikelola mengembalikan kesalahan, HRESULT dikonversi ke pengecualian, yang kemudian dilemparkan oleh runtime. Untuk informasi tentang nilai HRESULT dan pengecualian .NET Framework yang sesuai, lihat Cara: Memetakan HRESULT dan Pengecualian. Lihat Nilai HRESULT Umum dalam dokumentasi Windows untuk daftar nilai yang paling mungkin Anda temui.

Dimulai dengan .NET Framework 4.5, HResult setter properti dilindungi, sedangkan getter-nya adalah publik. Dalam versi .NET Framework sebelumnya, getter dan setter dilindungi.

Lihat juga

• Cara Memetakan HRESULT dan Pengecualian
• Nilai HRESULT Umum