ICustomTypeDescriptor，TypeDescriptionProvider，类型转换器和UITypeEditor的 [英] ICustomTypeDescriptor, TypeDescriptionProvider, TypeConverter, and UITypeEditor

问题描述

我想了解你如何使用ICustomTypeDescriptor，TypeDescriptionProvider，类型转换器和UITypeEditor的一个整体的认识改变如何PropertyGrid中显示和接口的对象。

I'm trying to get an overall understanding of how you use ICustomTypeDescriptor, TypeDescriptionProvider, TypeConverter, and UITypeEditor to change how a PropertyGrid displays and interfaces with an object.

谁能告诉我，如果这是正确的，或者如果我错过任何重要的概念或点？我真的只是想了解为何以及何时应该使用每个类。

Can someone tell me if this is right, or if I missed any major concepts or points? I'm really just trying to understand why and when you would use each class.

ICustomTypeDescriptor

• 在一个类实现此接口完全以覆盖类的本地属性和与ICustomTypeDescriptor.GetProperties返回的PropertyDescriptor替换它们（）

TypeDescriptionProvider

• 用于对现有属性来扩展一类


• 系统TypeDescriptionProvider通过TypeDescriptionProvider属性

追加到一个类
• 的TypeDescriptionProvider的GetTypeDescriptor（）方法返回一个ICustomTypeDescriptor为<强>的附的以该类型的现有属性


• 系统的PropertyGrid将显示通过反射发现的类的两个属性，属性增加。通过TypeDescriptionProvider

• Used to extend on the existing properties of a class
• A TypeDescriptionProvider is appended to a class through a TypeDescriptionProvider attribute
• The GetTypeDescriptor() method of the TypeDescriptionProvider returns an ICustomTypeDescriptor to be appended to the existing properties of the type.
• A PropertyGrid will show both the properties of the class found through Reflection, and the properties added to the class through the TypeDescriptionProvider

的TypeConverter

• 类型


• 之间的转换在使用PropetyGrid方面用于复杂类型和原始类型可以显示/在属性网格编辑之间进行转换。


• 也可使用的TypeConverter的GetStandard值的方法，以显示在PropertyGrid中可能值的列表

UITypeEditor的

• 定义操作复杂类型的属性的自定义编辑器。


• 有关通过属性的属性。

因此ICustomTypeDescriptor的TypeDescription提供用于添加/更改/替换对象的全部属性。 ，类型转换器和UITypeEditor的应用到各个属性和控制这些特定的属性如何与接口

So ICustomTypeDescriptor an TypeDescription provider are used to add/change/replace entire properties of objects. TypeConverter and UITypeEditor are applied to individual properties and control how those specific properties are interfaced with.

推荐答案

调整菜谱：

• TypeDescriptionProvider

• 还是替换的元数据（不扩展）


• 也可以为 TypeDescriptor.AddProvider


• 可以为每个类型的应用，以及每个实例，从而可以应用到列表，而无需执行 ITypedList

• still replaces metadata (not extends)
• can also be added be TypeDescriptor.AddProvider
• can be applied per-type as well as per-instance, making it possible to apply to lists without having to implement ITypedList

的TypeConverter

• 为的PropertyGrid ，这也是用来获取元数据的机制;注意， ExpandableObjectConverter 只是委托给 TypeDescriptor.GetProperties ，但这并非总是如此


• 还负责重新创建不可变对象（如结构）有改动

• for PropertyGrid, this is also the mechanism used to obtain metadata; note that ExpandableObjectConverter simply delegates to TypeDescriptor.GetProperties, but this is not always the case
• also responsible for re-creating immutable objects (such as structs) with changes

UITypeEditor的

• 还负责的PropertyGrid



• also responsible for painting the preview box in PropertyGrid

其他：

• IExtenderProvider - 追加的性能;这可能是你感到困惑什么用 TypeDescriptionProvider


• ITypedList - 广泛 ICustomTypeDescriptor 的双胞胎，但对于名单;可以通过使用 TypeDescriptionProvider ，并在任何一个非对象索引来避免的IList ，即公共ŧ这个[INT指数] {获得;}


• IListSource - 一个数据 - 之间提供间接源和数据;例如，数据表工具 IListSource ，返回默认视图时要求

• IExtenderProvider - appends properties; this may be what you were getting confused with TypeDescriptionProvider
• ITypedList - broadly the twin of ICustomTypeDescriptor, but for lists; can be avoided by use of TypeDescriptionProvider and a non-object indexer on any IList, i.e. public T this[int index] {get;}
• IListSource - provides indirection between a data-source and the data; for example, a DataTable implements IListSource, returning DefaultView when requested

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