ConfigurationElementCollection与许多不同类型的ConfigurationElements的 [英] ConfigurationElementCollection with a number of ConfigurationElements of different type

问题描述

是否有可能有一些不同的按照类型CollectionElements，例如，一个CollectionElementCollection：

Is it possible to have a CollectionElementCollection with a number of different by type CollectionElements, e.g.:

<collection>
    <add type="MyType1, MyLib" Type1SpecificProp="1" />
    <add type="MyType2, MyLib" Type2SpecificProp="2" />
</collection

我也需要这样的解决方案的所有类：

I have all classes required for such solution:

class MyCollection : ConfigurationElementCollection { }
class MyElement : ConfigurationElement { }
class MyType1 : MyElement { }
class MyType2 : MyElement { }
...
etc

但是当我开始我的申请，我得到下一个predictable错误：

but when I start my application I'm getting next predictable error:

无法识别的属性Type1SpecificProp。

Unrecognized attribute 'Type1SpecificProp'.

由于 Type1SpecificProp 在 MyType1 定义不是 MyElement ，特别是如果 MyCollection的有下一个方法：

because Type1SpecificProp is defined in MyType1 not MyElement, especially if MyCollection has next method:

protected override ConfigurationElement CreateNewElement()
{
    return new MyElement(); // but I want instantiate not the base class but by a type given
}

即。返回基类从而 OnDeserializeUnrecognizedAttribute（）儿童归类永远不会被调用。

i.e. returns base class thus OnDeserializeUnrecognizedAttribute() in child classed are never been called.

所以，问题是：如何让子类由他们自行解决未知的元素

So the question is: how to let child classes to resolve unknown elements by their self?

推荐答案

<$c$c>Microsoft.Practices.EnterpriseLibrary.Common.Configuration.PolymorphicConfigurationElementCollection<T>从EntLib5做好这项工作作为一个魅力。

Microsoft.Practices.EnterpriseLibrary.Common.Configuration.PolymorphicConfigurationElementCollection<T> from EntLib5 do this job as a charm.

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