考虑以下代码:classProgram{staticvoidMain(string[]args){Aa=newA();CreateB(a);GC.Collect();GC.WaitForPendingFinalizers();Console.WriteLine("Andhere's:"+a);GC.KeepAlive(a);}privatestaticvoidCreateB(Aa){Bb=newB(a);}}classA{}classB{privateWeakReferencea;publicB(Aa){this.a=newWeakReference(a);}~B(){Console.

这是我的表格设置:mysql>describea;+-------+------------+------+-----+---------+----------------+|Field|Type|Null|Key|Default|Extra|+-------+------------+------+-----+---------+----------------+|id|int(11)|NO|PRI|NULL|auto_increment||x|int(11)|YES||NULL|||y|varchar(1)|YES||NULL||+-------+------------+----