Article
11/18/2011

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

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Properties

	Name	Description
	IsClosed	Gets a value that indicates whether the handle is closed.
	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
	Close	Security Critical. Marks the handle for releasing and freeing resources.
	Dispose()	Releases all resources used by the CriticalHandle.
	Dispose(Boolean)	Security Critical. 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. (Overrides CriticalFinalizerObject.Finalize().)
	GetHashCode	Serves as a hash function for a particular type. (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	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.)

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Fields

	Name	Description
	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.

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