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SEHException Class

.NET Framework 4

Represents structured exception handling (SEH) errors.

System.Object
  System.Exception
    System.SystemException
      System.Runtime.InteropServices.ExternalException
        System.Runtime.InteropServices.SEHException

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

Syntax

C++

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[SerializableAttribute]
[ComVisibleAttribute(true)]
public class SEHException : ExternalException

The SEHException type exposes the following members.

Constructors

	Name	Description
	SEHException()	Initializes a new instance of the SEHException class.
	SEHException(String)	Initializes a new instance of the SEHException class with a specified message.
	SEHException(SerializationInfo, StreamingContext)	Initializes a new instance of the SEHException class from serialization data.
	SEHException(String, Exception)	Initializes a new instance of the SEHException class with a specified error message and a reference to the inner exception that is the cause of this exception.

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Properties

	Name	Description
	Data	Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
	ErrorCode	Gets the HRESULT of the error. (Inherited from ExternalException.)
	HelpLink	Gets or sets a link to the help file associated with this exception. (Inherited from Exception.)
	HResult	Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
	InnerException	Gets the Exception instance that caused the current exception. (Inherited from Exception.)
	Message	Gets a message that describes the current exception. (Inherited from Exception.)
	Source	Gets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
	StackTrace	Gets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
	TargetSite	Gets the method that throws the current exception. (Inherited from Exception.)

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Methods

	Name	Description
	CanResume	Indicates whether the exception can be recovered from, and whether the code can continue from the point at which the exception was thrown.
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetBaseException	When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetObjectData	When overridden in a derived class, sets the SerializationInfo with information about the exception. (Inherited from Exception.)
	GetType	Gets the runtime type of the current instance. (Inherited from Exception.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that contains the HRESULT of the error. (Inherited from ExternalException.)

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Events

	Name	Description
	SerializeObjectState	Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception.)

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Remarks

The SEHException class handles SEH errors that are thrown from unmanaged code, but that have not been mapped to another .NET Framework exception. The SEHException class also responds to the HRESULT E_FAIL, which has the value 0x80004005.

The .NET Framework often encounters unmanaged SEH exceptions that are automatically mapped to managed equivalents. There are two common unmanaged SEH exceptions:

STATUS_NO_MEMORY exceptions are automatically mapped to the OutOfMemoryException class.
STATUS_ACCESS_VIOLATION exceptions are automatically mapped as follows:
- If legacyNullReferencePolicy is applied, all access violations are mapped to the NullReferenceException class.
- If the address at which the read/write was attempted is not in JIT-compiled code, the exception is mapped to the AccessViolationException class.
- If the address at which the read/write was attempted is in JIT-compiled code, but it is not in the OS Null partition area, the exception is mapped to the AccessViolationException class.
- If there is no legacyNullReferencePolicy, and the address at which the read/write was attempted is in JIT-compiled code and in the OS Null partition area, the exception is mapped to the NullReferenceException class.

Any SEH exception that is not automatically mapped to a specific exception is mapped to the SEHException class by default.

For more information, search on "unmanaged exceptions" and "Structured Exception Handling" in the MSDN Library.

Note that the SEHException class does not cause unmanaged C++ exception destructors to be called. To ensure that unmanaged C++ exception destructors are called, use the following syntax in the catch block.

[Visual Basic]

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Catch 
     ' Handle catch here.
End Try

[C#]

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catch
{
     // Handle catch here.
}

[C++]

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catch(…)
{
     // Handle catch here.
}

Version Information

.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

Platforms

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.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Reference

System.Runtime.InteropServices Namespace

Exception

Other Resources

Handling and Throwing Exceptions

How to: Map HRESULTs and Exceptions

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FAQ

System.Runtime.interopService. External component has thrown an exception

I try to connect microcontroller board with serial port. But I get error when I debug. The following error is occur $0$0 $0 $0 $0 $0 $0"System.Runtime.InteropServices.SEHException: External component has thrown an exception.$0 $0 $0 $0 at _outp(UInt16 , Int32 )"$0 $0 $0 $0 $0 $0 $0$0 $0 $0What does the meaning of this error$0 $0 $0

History

4/20/2011
Mickeydora

SEHException

I am getting the above exeption when I try to run c# asp.net in vs2010 enviroment

History

10/27/2010
oromia_2