CriticalHandle Class

Reference

Definition

Namespace:: System.Runtime.InteropServices

Assemblies:: mscorlib.dll, System.Runtime.Handles.dll

Assembly:: System.Runtime.dll

Assembly:: System.Runtime.Handles.dll

Assembly:: mscorlib.dll

Assembly:: System.Runtime.InteropServices.dll

Assembly:: netstandard.dll

Source:: CriticalHandle.cs

Source:: CriticalHandle.cs

Source:: CriticalHandle.cs

Important

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Represents a wrapper class for handle resources.

public ref class CriticalHandle abstract : IDisposable

public ref class CriticalHandle abstract : System::Runtime::ConstrainedExecution::CriticalFinalizerObject, IDisposable

[System.Security.SecurityCritical]
public abstract class CriticalHandle : IDisposable

public abstract class CriticalHandle : System.Runtime.ConstrainedExecution.CriticalFinalizerObject, IDisposable

[System.Security.SecurityCritical]
public abstract class CriticalHandle : System.Runtime.ConstrainedExecution.CriticalFinalizerObject, IDisposable

[<System.Security.SecurityCritical>]
type CriticalHandle = class
    interface IDisposable

type CriticalHandle = class
    inherit CriticalFinalizerObject
    interface IDisposable

[<System.Security.SecurityCritical>]
type CriticalHandle = class
    inherit CriticalFinalizerObject
    interface IDisposable

Public MustInherit Class CriticalHandle
Implements IDisposable

Public MustInherit Class CriticalHandle
Inherits CriticalFinalizerObject
Implements IDisposable

Inheritance: Object
CriticalHandle

Inheritance: Object

CriticalFinalizerObject
CriticalHandle

Derived: Microsoft.Win32.SafeHandles.CriticalHandleMinusOneIsInvalid

Microsoft.Win32.SafeHandles.CriticalHandleZeroOrMinusOneIsInvalid

Attributes: SecurityCriticalAttribute

Implements: IDisposable

Remarks

The CriticalHandle class is similar to the SafeHandle class, except that SafeHandle implements reference counting. You can use CriticalHandle instead of SafeHandle to address performance considerations when you can provide the necessary synchronization more efficiently yourself.

Because the CriticalHandle class does not perform reference counting, it does not provide protection from handle recycling security attacks. Because the reference counting algorithm implicitly serializes operations, a certain amount of thread safety is also lost. If you call the IDisposable.Dispose or Close method while an operation that is using the handle is outstanding on another thread, or if you call IDisposable.Dispose or Close from two threads at the same time, the results are non-deterministic. The CriticalHandle class still provides the guaranteed critical finalization provided by the CriticalFinalizerObject class.

Constructors

CriticalHandle(IntPtr)

Initializes a new instance of the CriticalHandle class with the specified invalid handle value.

Fields

handle

Specifies the handle to be wrapped.

Properties

IsClosed	Gets a value indicating whether the handle is closed.
IsInvalid	When overridden in a derived class, gets a value indicating whether the handle value is invalid.

Methods

Close()	Marks the handle for releasing and freeing resources.
Dispose()	Releases all resources used by the CriticalHandle.
Dispose(Boolean)	Releases the unmanaged resources used by the CriticalHandle class specifying whether to perform a normal dispose operation.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Finalize()	Frees all resources associated with the handle.
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ReleaseHandle()	When overridden in a derived class, executes the code required to free the handle.
SetHandle(IntPtr)	Sets the handle to the specified pre-existing handle.
SetHandleAsInvalid()	Marks a handle as invalid.
ToString()	Returns a string that represents the current object. (Inherited from Object)

Applies to