• Article

CriticalHandle Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

This type can be used only by trusted applications. If you try to use its members in a partial-trust application, your code will throw a MethodAccessException exception. This type is security-critical, which restricts its use.

[SECURITY CRITICAL]

Represents a wrapper class for handle resources.

Inheritance Hierarchy

System.Object
  System.Runtime.ConstrainedExecution.CriticalFinalizerObject
    System.Runtime.InteropServices.CriticalHandle

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

Syntax

'Declaration
<SecurityCriticalAttribute> _
Public MustInherit Class CriticalHandle _
    Inherits CriticalFinalizerObject _
    Implements IDisposable

[SecurityCriticalAttribute]
public abstract class CriticalHandle : CriticalFinalizerObject, 
    IDisposable

The CriticalHandle type exposes the following members.

Constructors

  Name Description
Protected method CriticalHandle Initializes a new instance of the CriticalHandle class with the specified invalid handle value.

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Properties

  Name Description
Public property IsClosed Gets a value that indicates whether the handle is closed.
Public property IsInvalid When overridden in a derived class, gets a value that indicates whether the handle value is invalid.

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Methods

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

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Fields

  Name Description
Protected field handle Specifies the handle to be wrapped.

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Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

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