public void CollectX()
{
MyGCCollectClass myGCCol = new MyGCCollectClass();
// Determine the maximum number of generations the system
// garbage collector currently supports.
Console.WriteLine("The highest generation is {0}", GC.MaxGeneration);
myGCCol.MakeSomeGarbage();
// Determine which generation myGCCol object is stored in.
Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
// Determine the best available approximation of the number
// of bytes currently allocated in managed memory.
Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
// Perform a collection of generation 0 only.
GC.Collect(0);
// Determine which generation myGCCol object is stored in.
Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
// Perform a collection of all generations up to and including 2.
GC.Collect(2);
// Determine which generation myGCCol object is stored in.
Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
}
static void Main()
{
// Put some objects in memory.
MyGCCollectClass.MakeSomeGarbage();
Console.WriteLine("Memory used before collection: {0:N0}",
GC.GetTotalMemory(false));
// Collect all generations of memory.
GC.Collect();
Console.WriteLine("Memory used after full collection: {0:N0}",
GC.GetTotalMemory(true));
}
public void GetGeneration()
{
// Create a strong reference to an object.
MyGCCollectClass myGCCol = new MyGCCollectClass();
// Put some objects in memory.
myGCCol.MakeSomeGarbage();
// Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
// Perform a full garbage collection.
// Because there is a strong reference to myGCCol, it will
// not be garbage collected.
GC.Collect();
// Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
// Create a WeakReference to myGCCol.
WeakReference wkref = new WeakReference(myGCCol);
// Remove the strong reference to myGCCol.
myGCCol = null;
// Get the generation of managed memory where wkref is stored.
Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
// Perform another full garbage collection.
// A WeakReference will not survive a garbage collection.
GC.Collect();
// Try to get the generation of managed memory where wkref is stored.
// Because it has been collected, an exception will be thrown.
try {
Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
} catch (Exception e) {
Console.WriteLine("The WeakReference to the object has been garbage collected: '{0}'", e);
}
}
