是否有可能使用基于属性，而不是类型的泛型约束？ [英] Is it possible to use generic constraints based on attributes rather than types?

问题描述

我试着写一个类，将负责持续的应用选择。由于选项必须坚持认为，我送必须serialisable的值。

I'm trying to write a class that will be in charge of persisting application options. Since the options need to be persisted the values that I'm sent must be serialisable.

起初，我以为我已经能够与这样的签名写一个方法：

Initially I thought I've be able to write a method with a signature like this:

Public Sub SaveOption(Of T As ISerializable)(ByVal id As String, ByVal value As T)

如果你preFER C＃：

or if you prefer C#:

public void SaveOption<T>(string id, T value) where T : ISerializable

在原则上，这将是罚款，但对于具有＆LT类型，序列化＆GT; 属性？这方面最明显的例子是System.String，它不执行 ISerializable的，但显然这是一个类型，我应该能够保存。

In principle this would be fine, but what about types that have the <Serializable> attribute? The most notable example of this is System.String, it does not implement ISerializable, but clearly it is a type that I should be able to save.

那么，有没有我可以限制哪些类型允许进入的方法，在编译时，根据其属性的方式？

So, is there a way that I can restrict which types are allowed into a method at compiletime, based on their attributes?

推荐答案

您可以有重载的其他类型 - 把你的字符串例如：

You could have overloads for the other types - taking your string example:

public void SaveOption(string id, string value)

不过，串行化是...棘手;我希望你将不得不在运行时进行检查。

However; serializability is... tricky; I expect you're going to have to check this at runtime.

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