匿名对象的内存范围-C＃.Net

Question

I've the following code

DataView dvTest= dsTest.Tables[1].Copy().DefaultView;

Will the copy of the (huge) dataset dsTest be persisted in the memory or will it be Garbage Collected by default?

Does it copy the whole dataset to the memory? When the GC happens?

Answer 1

This may actually be two questions: 1) anonymous object lifetime, and 2) dataset lifetime.

for 1) - as soon as there are no references to the object, it is eligible to be garbage collected, just like a "named" object.

for 2) The defaultview of a datatable has a reference to the table, so the datatable will remain in memory until you no longer hold a reference to the view (or any rows, etc - anything that references the dataset).

Answer 2

It is very likely that it will hang around since the object referenced by DefaultView itself holds a reference to the object returned from Copy . And, of course, it will eventually be collected once it becomes unreachable. But, at the very least, your dvTest will cause it to persist for awhile anyway.

Answer 3

您正在复制DataTable，然后通过DefaultView在dvTest中保存对它的引用，因此，除非dvTest超出范围，否则它不会被垃圾收集。