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CriticalHandleZeroOrMinusOneIsInvalid Class

Provides a base class for Win32 critical handle implementations in which the value of either 0 or -1 indicates an invalid handle.

Namespace:  Microsoft.Win32.SafeHandles
Assembly:  mscorlib (in mscorlib.dll)

[SecurityPermissionAttribute(SecurityAction.InheritanceDemand, UnmanagedCode = true)]
public abstract class CriticalHandleZeroOrMinusOneIsInvalid : CriticalHandle

The CriticalHandleZeroOrMinusOneIsInvalid type exposes the following members.

Protected methodCriticalHandleZeroOrMinusOneIsInvalidInitializes a new instance of the CriticalHandleZeroOrMinusOneIsInvalid class.

Public propertyIsClosedGets a value indicating whether the handle is closed. (Inherited from CriticalHandle.)
Public propertyIsInvalidGets a value that indicates whether the handle is invalid. (Overrides CriticalHandle.IsInvalid.)

Public methodCloseMarks the handle for releasing and freeing resources. (Inherited from CriticalHandle.)
Public methodDispose()Releases all resources used by the CriticalHandle. (Inherited from CriticalHandle.)
Protected methodDispose(Boolean)Releases the unmanaged resources used by the CriticalHandle class specifying whether to perform a normal dispose operation. (Inherited from CriticalHandle.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeFrees all resources associated with the handle. (Inherited from CriticalHandle.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodReleaseHandleWhen overridden in a derived class, executes the code required to free the handle. (Inherited from CriticalHandle.)
Protected methodSetHandleSets the handle to the specified pre-existing handle. (Inherited from CriticalHandle.)
Public methodSetHandleAsInvalidMarks a handle as invalid. (Inherited from CriticalHandle.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Protected fieldhandleSpecifies the handle to be wrapped. (Inherited from CriticalHandle.)

This class derives from the System.Runtime.InteropServices.CriticalHandle class. It describes the format of an invalid handle. For example, some handles use -1 as an invalid handle value, while others use 0. Further derivations of this class (for example, file or registry handles) can specialize this further.

Use the CriticalHandleZeroOrMinusOneIsInvalid class when you need to wrap an unmanaged resource that does not have an existing managed wrapper.


See the CriticalHandle class for important information on critical handle security and thread safety.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • InheritanceDemand 

    for full trust for inheritors. This member cannot be inherited by partially trusted code.

  • 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.

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