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public static int GetGeneration(object obj) public static int GetGeneration(WeakReference wo) public static long GetTotalMemory(bool forceFullCollection) public static void KeepAlive(object obj)
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public static void RegisterForFullGCNotification( int maxGenerationThreshold, int largeObjectHeapThreshold)
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public static void RemoveMemoryPressure(long bytesAllocated) public static void ReRegisterForFinalize(object obj) public static void SuppressFinalize(object obj)
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TABLE 21-15 Methods De ned by GC
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Part II:
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Method public static GCNotificationStatus WaitForFullGCApproach( ) public static GCNotificationStatus WaitForFullGCApproach(int millisecondsTimeout) public static GCNotificationStatus WaitForFullGCComplete( ) public static GCNotificationStatus WaitForFullGCComplete(int millisecondsTimeout) public static void WaitForPendingFinalizers( )
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TABLE 21-15 Methods De ned by GC (continued)
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Meaning Waits for the notification that a full garbage-collection cycle is about to occur GCNotificationStatus is an enumeration defined in System Waits up to millisecondsTimeout milliseconds for the notification that a full garbage-collection cycle is about to occur GCNotificationStatus is an enumeration defined in System Waits for the notification that a full garbage-collection cycle has completed GCNotificationStatus is an enumeration defined in System Waits up to millisecondsTimeout milliseconds for the notification that a full garbage-collection cycle has completed GCNotificationStatus is an enumeration defined in System Halts execution of the invoking thread until all pending finalizers (ie, destructors) have been called
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For most applications, you will not use any of the capabilities of GC However, in specialized cases, they can be very useful For example, you might want to use Collect( ) to force garbage collection to occur at a time of your choosing Normally, garbage collection occurs at times unspecified by your program Since garbage collection takes time, you might not want it to occur during some time-critical task, or you might want to take advantage of idle time to perform garbage collection and other types of housekeeping chores You can also register for notifications about the approach and completion of garbage collection There are two methods that are especially important if you have unmanaged code in your project AddMemoryPressure( ) and RemoveMemoryPressure( ) These are used to indicate that a large amount of unmanaged memory has been allocated or released by the program They are important because the memory management system has no oversight on unmanaged memory If a program allocates a large amount of unmanaged memory, then performance might be affected because the system has no way of knowing that free memory has been reduced By calling AddMemoryPressure( ) when allocating large amounts of unmanaged memory, you let the CLR know that memory has been reduced By calling RemoveMemoryPressure( ), you let the CLR know the memory has been freed Remember: RemoveMemoryPressure( ) must be called only to indicate that memory reported by a call to AddMemoryPressure( ) has been released
Object
Object is the class that underlies the C# object type The members of Object were discussed in 11, but because of its central role in C#, its methods are repeated in Table 21-16 for your convenience Object defines one constructor, which is shown here: public Object( ) It constructs an empty object
21:
Exploring the System Namespace
Method public virtual bool Equals(object obj) public static bool Equals(object objA, object objB) protected Finalize( ) public virtual int GetHashCode( ) public Type GetType( ) protected object MemberwiseClone( ) public static bool ReferenceEquals(object objA, object objB) public virtual string ToString( )
TABLE 21-16 Methods De ned by Object
Purpose Returns true if the invoking object is the same as the one referred to by obj Returns false otherwise Returns true if objA is the same as objB Returns false otherwise Performs shutdown actions prior to garbage collection In C#, Finalize( ) is accessed through a destructor Returns the hash code associated with the invoking object Obtains the type of an object at runtime Makes a shallow copy of the object This is one in which the members are copied, but objects referred to by members are not Returns true if objA and objB refer to the same object Returns false otherwise Returns a string that describes the object
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