ComponentModel反射（例如PropertyDescriptor的）和标准反射（如的PropertyInfo）之间的区别？ [英] Difference between ComponentModel reflection (e.g PropertyDescriptor) and standard reflection (e.g PropertyInfo)?

问题描述

之间存在什么ü可以与他们做一个独特的重叠。是ComponentModel反思的东西刚上的System.Reflection之上一点点友好层

There is a distinct overlap between what u can do with both of them. Is the ComponentModel reflection stuff just a little friendlier layer on top of System.Reflection?

推荐答案

没有？ - 还有更多。 ComponentModel允许你做了几个DLR型的东西，比如运行时性能。这是一个DataView如何暴露列的网格 - 他们不是反射特性 - 他们是运行时属性。这里的关键词是 ICustomTypeDescriptor 和 TypeDescriptionProvider 。

No - there is more. ComponentModel allows you to do a few DLR-type things, such as runtime-properties. This is how a DataView exposes columns to a grid - they aren't reflection properties - they are runtime properties. The keywords here are ICustomTypeDescriptor and TypeDescriptionProvider.

这模型还允许抽象和间接。例如，如果你是做了很多的属性反思，考虑 HyperDescriptor - 这是一个实用程序我写道，使用自定义的的PropertyDescriptor 实施交换反射模型预编译的模型中，巨大的性能提升。

This model also allows abstraction and indirection. For example, if you are doing a lot of reflection on properties, consider HyperDescriptor - this is a utility I wrote that uses a custom PropertyDescriptor implementation to swap the reflection model for a pre-compiled model, for huge performance boosts.

在使用方面，也有一些其他方面的差异; ComponentModel仅支持构件（不像反射，其中多个相似属性是允许的话）的任何属性的一个实例。它是以数据为中心 - 因此属性的存在，因为这样做的事件（主要用于变更通知） - 但有没有字段也没有方法

In terms of usage, there are some other differences; ComponentModel only supports a single instance of any attribute on a member (unlike reflection, where multiple alike attributes are allows). And it is data-centric - so properties exist, as do events (primarily intended for change notification) - but there are no fields nor methods.

它也有很好的支持对于国际化 - 因为显示名称等可以实时进行定制

It also has good support for i18n - since the DisplayName etc can be customized on the fly.

不过，ComponentModel不（直接）的东西像LINQ（特别MemberExpression）兼容 - 因为这要绑定到反射数据。

However, ComponentModel is not (directly) compatible with things like LINQ (MemberExpression in particular) - since this wants to bind to reflection data.

最后，ComponentModel高度由之类的PropertyGrid IDE中使用（这东西像工具提示的额外的属性是如何工作的） ，但同样几乎所有的UI通过数据绑定ComponentModel发生（因为这允许绑定到数据表支持，类，和其他任何你能想到的）。

Finally, ComponentModel is highly used in the IDE by things like PropertyGrid (this is how things like the extra properties for tool-tips work), but equally almost all UI data binding happens via ComponentModel (since this allows the binding to support DataTable, classes, and anything else you can think of).

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