每次在HeaderedContentControl中创建新实例 [英] Creates new instance everytime in HeaderedContentControl

问题描述

我有一个名为CurrentPage(例如B类型)的属性，该属性绑定到HeaderedContentControl的内容.

并且我有一个名为MyPages的B类型集合(所有实例都在这里创建一次).

现在当我说CurrentPage = MyPages [0];它会创建一个新实例，尽管它不会创建一个实例.

用同样的方式当我说CurrentPage = MyPages [1];再次创建一个新实例.

我不明白为什么要这么做.

每次我执行上述任务时，它都会消耗内存.

这是什么原因?

预先谢谢您

Hi,

I have a property named CurrentPage(eg: B type) bound to Content of HeaderedContentControl.

and I have a collection of B type named MyPages (All the instances have been created here once).

Now when I say CurrentPage = MyPages[0]; it creates a new instance though it does not go to create one.

Same way When I say CurrentPage = MyPages[1]; again it creates a new instance.

I am not getting why it does this.

It consumes memory every time I do above kind of assignment.

What would be the cause here?

Thank you in advance

推荐答案

只是一个猜测:也许MyPages集合是某种自定义类型的，并且在使用索引调用时实例化了所请求对象的副本吗? />
代码类似于

Just a guess: Maybe the MyPages collection is of some custom type and instantiates a copy of the requested object when called with an index?

The code would be something like

public class MyPagesCollection
{
    private List<page> _innerList = new List<page>();

    public this[int index]
    {
        get
        {
            Page page = _innerList[index].Copy();

            DoSomethingImportantWith(page);

            return(page);
        }
    }
}</page></page>

通常，很难不看相关的代码.

In general, it''s hard to say without seeing the relevant code.

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