自定义 .NET 属性的实际使用

问题描述

您在现实世界中将自定义 .NET 属性用于哪些方面?

What kind of things have you used custom .NET attributes for in the real world?

我已经阅读了几篇关于它们的文章，但我从未使用过自定义属性.

I've read several articles about them, but I have never used custom attributes.

我觉得当它们有用时我可能会忽略它们.

I feel like I might be overlooking them when they could be useful.

我说的是您创建的属性，而不是已经包含在框架中的属性.

I am talking about attributes that you create, not ones that are already included in the framework.

推荐答案

我已经使用它们自定义"属性进行验证(即使用我自己的信用卡验证"标记要验证的字段)和自定义 LinqToLucene 分析器我已经写过(即指定在给定字段上使用哪个分析器).

I've used them "custom" attributes for validation (ie. marking a field to be validated with my own "credit card validation") and custom LinqToLucene analyzers I've written (ie. specifying which analyzer to use on a given field).

例如，验证代码如下所示:

The validation code, for example, would look something like this:

public class Customer
{
     [CreditCardValidator]
     string creditCardNumber;

     [AddressValidator]
     string addressLineOne
}

验证上述对象时，由于自定义"属性，每个字段都使用适当的验证器进行验证.

When the object above is validated, each field is validated with the appropriate validator thanks to the "custom" attribute.

在我编写的 LinqToLucene 内容中，自定义属性非常好，因为它们允许您在运行时(通过反射)查找特定字段.例如，如果您有一个客户对象，您可能有兴趣获取所有已标记为索引我"的属性:自定义属性让您可以轻松完成此操作，因为它以一种方式公开有关该对象的元数据:查询方便.

In the LinqToLucene stuff I've written custom attributes are nice because they allow you to find (through reflection) specific fields at run time. For example, if you have a customer object, you may be interested in getting all the properties that have been marked as "index me": a custom attribute lets you do this easily since it exposes meta-data about the object in a manner that is easy to query.

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