SEHException Class

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)

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

The SEHException type exposes the following members.

  NameDescription
Public methodSEHException()Initializes a new instance of the SEHException class.
Public methodSEHException(String)Initializes a new instance of the SEHException class with a specified message.
Protected methodSEHException(SerializationInfo, StreamingContext)Initializes a new instance of the SEHException class from serialization data.
Public methodSEHException(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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  NameDescription
Public propertyDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertyErrorCodeGets the HRESULT of the error. (Inherited from ExternalException.)
Public propertyHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Protected propertyHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertyInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertyMessageGets a message that describes the current exception. (Inherited from Exception.)
Public propertySourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertyStackTraceGets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
Public propertyTargetSiteGets the method that throws the current exception. (Inherited from Exception.)
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  NameDescription
Public methodCanResumeIndicates whether the exception can be recovered from, and whether the code can continue from the point at which the exception was thrown.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetObjectDataWhen overridden in a derived class, sets the SerializationInfo with information about the exception. (Inherited from Exception.)
Public methodGetTypeGets the runtime type of the current instance. (Inherited from Exception.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that contains the HRESULT of the error. (Inherited from ExternalException.)
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  NameDescription
Protected eventSerializeObjectStateOccurs 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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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]

Catch 
     ' Handle catch here.
End Try

[C#]

catch
{
     // Handle catch here.
}

[C++]

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

.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

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.

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