Marshal.ThrowExceptionForHR Method (Int32, IntPtr)

Throws an exception with a specific failure HRESULT.

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

public static void ThrowExceptionForHR (
	int errorCode,
	IntPtr errorInfo
public static void ThrowExceptionForHR (
	int errorCode, 
	IntPtr errorInfo
public static function ThrowExceptionForHR (
	errorCode : int, 
	errorInfo : IntPtr
Not applicable.



The HRESULT corresponding to the desired exception.


A pointer to the IErrorInfo interface provided by the COM object.

This method creates an exception object for the specified failure HRESULT. If the HRESULT is 0 or positive (a success code), the method returns without creating or throwing an exception.

The ThrowExceptionForHR method releases the errorInfo parameter, decreasing the COM reference count of the IErrorInfo interface.

Note that the ThrowExceptionForHR method returns an exception based on the IErrorInfo of the current thread if one is set. When this happens, the errorCode parameter is ignored.

Some failure HRESULTs map to well-defined exceptions, while others do not map to a defined exception. If the HRESULT maps to a defined exception, ThrowExceptionForHR creates an instance of the exception and throws it. Otherwise, it creates an instance of System.Runtime.InteropServices.COMException, initializes the error code field with the HRESULT, and throws that exception. The errorInfo parameter is used to retrieve extra information regarding the error.

For the mapping from each HRESULT to its comparable exception class in the .NET Framework, see How to: Map HRESULTs and Exceptions.


This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0