Article
11/18/2011

SafeHandleZeroOrMinusOneIsInvalid 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]

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

Inheritance Hierarchy

System.Object
  System.Runtime.ConstrainedExecution.CriticalFinalizerObject
    System.Runtime.InteropServices.SafeHandle
      Microsoft.Win32.SafeHandles.SafeHandleZeroOrMinusOneIsInvalid
        Microsoft.Win32.SafeHandles.SafeWaitHandle

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

Syntax

'Declaration
<SecurityCriticalAttribute> _
Public MustInherit Class SafeHandleZeroOrMinusOneIsInvalid _
    Inherits SafeHandle

[SecurityCriticalAttribute]
public abstract class SafeHandleZeroOrMinusOneIsInvalid : SafeHandle

The SafeHandleZeroOrMinusOneIsInvalid type exposes the following members.

Constructors

	Name	Description
	SafeHandleZeroOrMinusOneIsInvalid	Initializes a new instance of the SafeHandleZeroOrMinusOneIsInvalid class, specifying whether the handle is to be reliably released.

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Properties

	Name	Description
	IsClosed	Gets a value indicating whether the handle is closed. (Inherited from SafeHandle.)
	IsInvalid	Gets a value that indicates whether the handle is invalid. (Overrides SafeHandle.IsInvalid.)

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Methods

	Name	Description
	Close	Security Critical. Marks the handle for releasing and freeing resources. (Inherited from SafeHandle.)
	DangerousAddRef	Security Critical. Manually increments the reference counter on SafeHandle instances. (Inherited from SafeHandle.)
	DangerousGetHandle	Returns the value of the handle field. (Inherited from SafeHandle.)
	DangerousRelease	Security Critical. Manually decrements the reference counter on a SafeHandle instance. (Inherited from SafeHandle.)
	Dispose()	Releases all resources used by the SafeHandle class. (Inherited from SafeHandle.)
	Dispose(Boolean)	Security Critical. Releases the unmanaged resources used by the SafeHandle class specifying whether to perform a normal dispose operation. (Inherited from SafeHandle.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Frees all resources associated with the handle. (Inherited from SafeHandle.)
	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. (Inherited from SafeHandle.)
	SetHandle	Sets the handle to the specified pre-existing handle. (Inherited from SafeHandle.)
	SetHandleAsInvalid	Security Critical. Marks a handle as no longer used. (Inherited from SafeHandle.)
	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. (Inherited from SafeHandle.)

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Version Information

Silverlight

Supported in: 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

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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