C#中的内存泄漏

问题描述

当您确保所有句柄、实现 IDispose 的东西都被释放时，在托管系统中是否有可能泄漏内存?

Is it ever possible in a managed system to leak memory when you make sure that all handles, things that implement IDispose are disposed?

会不会有遗漏某些变量的情况?

Would there be cases where some variables are left out?

推荐答案

事件处理程序是非明显内存泄漏的一个非常常见的来源.如果您从 object2 订阅 object1 上的事件，然后执行 object2.Dispose() 并假装它不存在(并从代码中删除所有引用)，则 object1 的事件中有一个隐式引用将阻止 object2垃圾收集.

Event Handlers are a very common source of non-obvious memory leaks. If you subscribe to an event on object1 from object2, then do object2.Dispose() and pretend it doesn't exist (and drop out all references from your code), there is an implicit reference in object1's event that will prevent object2 from being garbage collected.

MyType object2 = new MyType();

// ...
object1.SomeEvent += object2.myEventHandler;
// ...

// Should call this
// object1.SomeEvent -= object2.myEventHandler;

object2.Dispose();

这是一个常见的泄漏案例 - 忘记轻松取消订阅事件.当然，如果 object1 被收集，object2 也会被收集，但在此之前不会.

This is a common case of a leak - forgetting to easily unsubscribe from events. Of course, if object1 gets collected, object2 will get collected as well, but not until then.

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