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CriticalHandleMinusOneIsInvalid Class

CriticalHandleMinusOneIsInvalid Class

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

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

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

The CriticalHandleMinusOneIsInvalid type exposes the following members.

Protected methodCriticalHandleMinusOneIsInvalidInitializes a new instance of the CriticalHandleMinusOneIsInvalid 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 the default hash function. (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 that uses a value of -1. Further derivations of this class (for example, file or registry handles) can specialize this further.

This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the “Using an Object that Implements IDisposable” section in the IDisposable interface topic.


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

.NET Framework

Supported in: 4.6, 4.5, 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.

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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