在不修改类的情况下在属性网格中扩展自定义对象? [英] Expand custom object in property grid without any modifications to the class?

问题描述

默认情况下，自定义对象是灰色的，并且不可扩展:

By default, custom objects are grayed out, and not expandable:

我知道可以使用 ExpandableObjectConverter 使它们可扩展，但这需要扩展原始类.

I know it's possible to make them expandable using ExpandableObjectConverter, but that requires extending the original class.

如果不能修改原来的类怎么办?是否有处理属性网格内自定义对象扩展的通用方法?

What if I cannot modify the original class? Is there a generic approach of handling custom object expansion inside a property grid?

推荐答案

您可以在运行时为 ExpandableObjectConverter 动态添加 TypeConverterAttribute，使用类似以下内容(VB.NET).

You can dynamically add the TypeConverterAttribute for the ExpandableObjectConverter at runtime, using something like the following (VB.NET).

Dim attr = New TypeConverterAttribute(GetType(ExpandableObjectConverter))
TypeDescriptor.AddAttributes(GetType(ExtensionDataObject), attr)

您需要为您想要扩展的每种类型AddAttribute.如果类型都在特定的命名空间中，您可以使用反射来查找它们:

You would need to AddAttribute for each type you want to be expandable. If the types are all in a specific namespace, you could use reflection to find them:

Dim assm = Assembly.GetExecutingAssembly() ' or some other assembly
For Each t In assm.GetTypes().Where(Function(x) x.Namespace = "InterestingTypes")
    TypeDescriptor.AddAttributes(t, attr)
Next

(抱歉语法高亮显示损坏 - 我应该使用 C#！)

(sorry for the broken syntax highlighting - I should have used C#!)

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