Ensures that all finalization code in derived classes is marked as critical.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|Equals(Object)||Determines whether the specified Object is equal to the current Object. (Inherited from Object.)|
|Finalize||Releases all the resources used by the class. (Overrides Object.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.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
Classes that are derived from the class are implicitly treated as a constrained execution region (CER). This requires code in the finalizer to only call code with a strong reliability contract. For more information about CERs, see the System.Runtime.ConstrainedExecution namespace.
In a Silverlight-based application, you cannot inherit from the class.
In classes that are derived from the class, the common language runtime (CLR) guarantees that all critical finalization code will be given the opportunity to execute, provided the finalizer follows the rules for a CER, even when the CLR forcibly unloads an application domain or ends a thread. If a finalizer violates the rules for a CER, it might not successfully execute. In addition, the CLR establishes a weak ordering among normal and critical finalizers: For objects that are reclaimed by garbage collection at the same time, all the noncritical finalizers are called before any of the critical finalizers. For example, a class such as FileStream, which holds data in the SafeHandle class that is derived from , can run a standard finalizer to flush out existing buffered data.
In most cases, you do not have to write classes that derive from the class. The .NET Framework class library provides two classes, SafeHandle and CriticalHandle, that provide critical finalization functionality for handle resources. Furthermore, the .NET Framework provides a set of prewritten classes derived from the SafeHandle class, and this set is located in the Microsoft.Win32.SafeHandles namespace. These classes are designed to provide common functionality for supporting file and operating system handles.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.