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  "contentMarkdown": "# Destroy\n\n> 创建时间：2020/6/19 17:02\n\nRef: <https://www.cnblogs.com/timeObjserver/p/7575035.html>\n\n## 概述\n\nUNITY Destroy()和DestroyImadiate()都不会立即释放对象内存\n\nDestroyImadiate是立即将物体从场景hierachy中移除，并标记为 “null”，注意 是带引号的null。这是UNITY内部的一个处理技巧。关于这个技巧有很争议。\n\nDestroy要等到帧末才会将物体从场景层级中移除并标记为”null”。\n\n不管如何，二者都只是UNITY引擎层面的标记与处理，但在.NET底层，对象的内存都没有释放，只有手动GC.Collect()或等待NET去GC时才会释放掉对象内存。\n如果该对象在其他地方还有引用的话，GC也无法将对象的内存释放。\n\n## 注意点\n\n（1）obj并不会立即销毁，而是需要等待下一个Update更新，所以还是可以被print出来；\n（2）DestroyImmediate立即对对像进行销毁，print出来是null；\n（3）Destroy销毁场景中的物体，但内存中还存在，当令它需要销毁时，只是给一个标识。而内存中它依然是存在的，只有当内存不够，或一段时间没有再次被引用时（或者更多合理的条件满足），机制才会将它销毁并释放内存；\n（4）这样做的目的就是为了避免频繁对内存的读写操作。回收器会定时清理一次内存中引用计数为0的对象，很可能你的要销毁的对象在其他地方还有引用而你自己不清楚，直接销毁可能导致其他地方空引用错误；\n（5）建议使用平常Destroy函数，而不是DestroyImmediate函数；\n\n## 测试\n\n测试代码如下：点ADD按钮不断创建对象，点DEL按钮清除所有对象，通过观察进程内存数值来察看对象内存是否释放。\n\n```csharp\nstring s1 = &quot;Hello &quot;;\nstring s2 = s1;\ns1 += &quot;World&quot;;\n\nSystem.Console.WriteLine(s2);\n//Output: Hello\n\n```\n"
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