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Marshal.ThrowExceptionForHR Method (Int32, IntPtr)

Updated: July 2009

Throws an exception with a specific failure HRESULT.

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

[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public static void ThrowExceptionForHR(
	int errorCode,
	IntPtr errorInfo
)

Parameters

errorCode
Type: System.Int32

The HRESULT corresponding to the desired exception.

errorInfo
Type: System.IntPtr

A pointer to the IErrorInfo interface that provides more information about the error. You can specify IntPtr(0) to use the current IErrorInfo interface, or IntPtr(-1) to ignore the current IErrorInfo interface and construct the exception just from the error code.

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.

NoteNote:

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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0

Date

History

Reason

July 2009

Expanded the description of the errorInfo parameter.

Information enhancement.

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