垃圾收集器C＃中，关于“清算”的对象问题 [英] Garbage Collector C#, question about 'clearing' objects

问题描述

我也读到了垃圾收集一些信息（它是如何的作品等）。我试图理解它是如何工作的做我的例子，但我觉得我有问题。我知道垃圾收集器运行时：B您调用GC.Collect（）结果
内存不够，结果$ B $。结果
这是我的代码：

I read some informations about Garbage Collection (how it's works etc.). I tried understand how it's working doing my examples but I think I have problem. I know Garbage Collector runs when:
is not enough memory,
you call GC.Collect().
This is my code:

public partial class Form1 : Form
{
    public Testing _d;
    public Boolean _first = false;

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (!_first)
        {
            _d = new Testing();
            int test = _d.DoSomething("example");
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {
        _first = true;
    }

    private void button3_Click(object sender, EventArgs e)
    {
        //if (_first)
        //{
        //    _d = null;
        //}
        GC.Collect();
    }
}

public class Testing
{
    private ASCIIEncoding _ascii;
    private bool _disposed = false;

    public Testing()
    {
        _ascii = new ASCIIEncoding();
    }

    public int DoSomething(string message)
    {
        return _ascii.GetByteCount(message);
    }
}

当我点击按钮1，我创建新的对象测试。 _D是参考这个新​​的对象。我在使用反倾销JetBrains公司dotTrace内存内存，看到这个新对象存在。点击按钮2之后，我布尔_first以_D变得无法访问设置为true。在这一点上，我想，当我运行GC.Collect的（）GC将清除这个对象从堆栈，但我看到它仍然存在。我误解了有关GC的工作？或者说我这样做不对结果
它的工作当我设置 _D = NULL;

When I click button1 I'm creating new object Testing. _d is reference to this new object. I'm dumping memory using JetBrains dotTrace Memory and see this new object exists. After click button2 I'm setting boolean _first to true in order to _d became unreachable. At this point I thought when I run GC.Collect() GC will 'clear' this object from stack, but I see it's still exists. I misunderstood about GC work? or I'm doing this wrong?
It's working when I set _d = null;

推荐答案

设置第一= FALSE 不作 _D 实例无法访问在在GC的条款。从逻辑上讲，你可能永远不会再使用它，但它仍然是在 Form1中类引用。

Setting first=false does not make the _d instance unreachable in terms of the the GC. Logically you may never use it again but it is still referenced in the Form1 class.

如果有人设置第一= TRUE 再次，你不能指望对象仍然是可用的？

If someone were to set first=true again, would you not expect the object to still be usable?

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