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Exception.HResult Property

Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

protected int HResult { get; set; }

Property Value

Type: System.Int32
The HRESULT value.

HRESULT is a 32-bit value, divided into three different fields: a severity code, a facility code, and an error code. The severity code indicates whether the return value represents information, warning, or error. The facility code identifies the area of the system responsible for the error. The error code is a unique number that is assigned to represent the exception. Each exception is mapped to a distinct HRESULT. When managed code throws an exception, the runtime passes the HRESULT to the COM client. When unmanaged code returns an error, the HRESULT is converted to an exception, which is then thrown by the runtime.

The following code example defines a derived Exception class that sets the HResult property in its constructor.

// 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 example of Exception.HResult " +
                "generates the following output.\n" );

            // This function forces a division by 0 and throws 
            // a second exception.
                    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()

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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