从属性走到CustomAttributeData或向后走 [英] Walk from Attribute to CustomAttributeData or backwards

问题描述

问题。是否有一种方法可以根据我的自定义属性的给定实例（例如<$ c）获取 CustomAttributeData 的实例$ c> MyAttribute ？或反之亦然？

Question. Is there a way to get an instance of CustomAttributeData based on the given instance of my custom attribute, say, MyAttribute? Or vice versa?

为什么要这样做？ MyAttribute 的实例包含我感兴趣的属性，而 CustomAttributeData 的实例包含我感兴趣的实际构造函数参数。因此，现在实现双重工作： first ，获取 MyAttribute 的实例，方法是调用

Why do I need this? The instance of MyAttribute contains properties I am interested in, while the instance of CustomAttributeData contains actual constructor parameters I am interested in. So now I implement double work: first, get the instance of MyAttribute by calling

Attribute.GetCustomAttribute(property, typeof(MyAttribute)) as MyAttribute

和 second ，获取实例 CustomAttributeData 通过调用

CustomAttributeData.GetCustomAttributes(property)

，然后遍历此收藏集。

P 。 S。。我查看了这个问题，但没有在此处找到所需的解决方案。

P. S. I have taken a look on this question, but didn't find the desired solution there.

推荐答案

如果我正确理解了您的问题，那么您已经有一个自定义属性MyAttributeInstance的实例，并且您想为同一实例获取CustomAttributeData，最好是一步完成。

If I understand your question correctly, you already have an instance of the custom attribute MyAttributeInstance, and you want to get the CustomAttributeData for that same instance, preferably in one step.

由于您已经找到MyAttributeInstance，并且该属性已附加到属性（或类或...）上，因此我假定您具有该属性。因此，这可能可能为您工作：

Since you already found the MyAttributeInstance, and that is attached to a property (or a class, or...), I will assume you have the property available. So this could possibly work for you:

CustomAttributeData CAD = property.GetCustomAttributesData().First(x => x.AttributeType == MyAttributeInstance.GetType());

我认为这回答了您的实际问题。但是，我认为您的意图可能实际上是在询问如何直接从属性获取CustomAttributeData。在这种情况下，请尝试以下操作：

I think that answers your actual question. However, I think your intent might have been to actually ask how to get the CustomAttributeData from a property directly. In that case try this:

CustomAttributeData CAD = property.GetCustomAttributesData().First(x => x.AttributeType == typeof(MyAttribute));

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