卸载使用 Assembly.LoadFrom() 加载的程序集

问题描述

我需要检查加载 dll 后运行 GetTypes() 的时间量.代码如下.

I need to check the time amount to run GetTypes() after loading the dll. The code is as follows.

Assembly assem = Assembly.LoadFrom(file);
sw = Stopwatch.StartNew();
var types1 = assem.GetTypes();
sw.Stop();
double time1 = sw.Elapsed.TotalMilliseconds;

我想卸载并重新加载 dll 以检查再次运行 GetTypes() 所花费的时间.

I'd like to unload and reload the dll to check the time to spend in running GetTypes() again.

• 如何卸载?assem = null 够好吗?
• 有没有明确的方法来调用垃圾收集器来回收分配给 assem 的资源?

推荐答案

不幸的是，一旦程序集被加载，您就无法卸载它.但是您可以卸载 AppDomain.您可以做的是创建一个新的 AppDomain (AppDomain.CreateDomain(...) )，将程序集加载到此 appdomain 中以使用它，然后在需要时卸载 AppDomain.卸载 AppDomain 时，将卸载所有已加载的程序集.(请参阅参考)

Unfortunately you can not unload an assembly once it is loaded. But you can unload an AppDomain. What you can do is to create a new AppDomain (AppDomain.CreateDomain(...) ), load the assembly into this appdomain to work with it, and then unload the AppDomain when needed. When unloading the AppDomain, all assemblies that have been loaded will be unloaded. (See reference)

要调用垃圾收集器，可以使用

To call the garbage collector, you can use

GC.Collect(); // collects all unused memory
GC.WaitForPendingFinalizers(); // wait until GC has finished its work
GC.Collect();

GC 在后台线程中调用终结器，这就是为什么您必须等待并再次调用 Collect() 以确保您删除了所有内容.

GC calls the finalizers in a background thread, that's why you have to wait and call Collect() again to make sure you deleted everything.

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