CriticalHandleZeroOrMinusOneIsInvalid CriticalHandleZeroOrMinusOneIsInvalid CriticalHandleZeroOrMinusOneIsInvalid CriticalHandleZeroOrMinusOneIsInvalid Class


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

public ref class CriticalHandleZeroOrMinusOneIsInvalid abstract : System::Runtime::InteropServices::CriticalHandle
public abstract class CriticalHandleZeroOrMinusOneIsInvalid : System.Runtime.InteropServices.CriticalHandle
type CriticalHandleZeroOrMinusOneIsInvalid = class
    inherit CriticalHandle
Public MustInherit Class CriticalHandleZeroOrMinusOneIsInvalid
Inherits 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.

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.


CriticalHandleZeroOrMinusOneIsInvalid() CriticalHandleZeroOrMinusOneIsInvalid() CriticalHandleZeroOrMinusOneIsInvalid() CriticalHandleZeroOrMinusOneIsInvalid()

Initializes a new instance of the CriticalHandleZeroOrMinusOneIsInvalid class.


IsClosed IsClosed IsClosed IsClosed

Gets a value indicating whether the handle is closed.

(Inherited from CriticalHandle)
IsInvalid IsInvalid IsInvalid IsInvalid

Gets a value that indicates whether the handle is invalid.


Close() Close() Close() Close()

Marks the handle for releasing and freeing resources.

(Inherited from CriticalHandle)
Dispose() Dispose() Dispose() Dispose()

Releases all resources used by the CriticalHandle.

(Inherited from CriticalHandle)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

Releases the unmanaged resources used by the CriticalHandle class specifying whether to perform a normal dispose operation.

(Inherited from CriticalHandle)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ReleaseHandle() ReleaseHandle() ReleaseHandle() ReleaseHandle()

When overridden in a derived class, executes the code required to free the handle.

(Inherited from CriticalHandle)
SetHandle(IntPtr) SetHandle(IntPtr) SetHandle(IntPtr) SetHandle(IntPtr)

Sets the handle to the specified pre-existing handle.

(Inherited from CriticalHandle)
SetHandleAsInvalid() SetHandleAsInvalid() SetHandleAsInvalid() SetHandleAsInvalid()

Marks a handle as invalid.

(Inherited from CriticalHandle)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)


handle handle handle handle

Specifies the handle to be wrapped.

(Inherited from CriticalHandle)


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

requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Applies to

See also