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Marshal.GetHRForException Method

Converts the specified exception to an HRESULT.

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

public static int GetHRForException(
	Exception e


Type: System.Exception
The exception to convert to an HRESULT.

Return Value

Type: System.Int32
The HRESULT mapped to the supplied exception.

GetHRForException also sets up an IErrorInfo Interface interface for the exception that can be obtained by calling the COM GetErrorInfoNEEDGUID function. You can use this function to return an HRESULT value on a managed class implementation of a COM interface where you apply the System.Runtime.InteropServices.PreserveSigAttribute. Have the attributed method catch all exceptions and use GetHRForException to return the appropriate HRESULT value. Allowing an exception to propagate outside the method produces incorrect behavior. (In fact, the common language runtime fails to pass an exception to a COM client that calls such a method through a v-table.)

Note that the GetHRForException method sets the IErrorInfo of the current thread. This can cause unexpected results for methods like the ThrowExceptionForHR methods that default to using the IErrorInfo of the current thread if it is set.

.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

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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.