C＃：在方法参数（不是通用的参数）限制类型 [英] C#: Restricting Types in method parameters (not generic parameters)

问题描述

我想$，如C $ CA功能如下

I'd like to code a function like the following

public void Foo(System.Type t where t : MyClass)
{ ... }

在换句话说，参数类型为的System.Type ，我想限制所允许的键入取值那些从获得 MyClass的。

In other words, the argument type is System.Type, and I want to restrict the allowed Types to those that derive from MyClass.

有没有什么办法语法指定这个，或者做 T 已在运行时检查？

Is there any way to specify this syntactically, or does t have to be checked at runtime?

推荐答案

如果你的方法必须采取的类型的类型，因为它的说法，我不认为有办法做到这一点。如果你有方法灵活调用，你可以做：公共无效美孚（MyClass的MyClass的）和获得型致电.GetType（）

If your method has to take a Type type as it's argument, I don't think there's a way to do this. If you have flexibility with the method call you could do: public void Foo(MyClass myClass) and the get the Type by calling .GetType().

要扩大一点。 System.Type的是参数的类型，所以没有办法进一步明确哪些应该传递。就像一个方法，需要1到10之间的整数，必须采取一个int，然后进行运行时检查的范围是适当的遵守。

To expand a little. System.Type is the type of the argument, so there's no way to further specify what should be passed. Just as a method that takes an integer between 1 and 10, must take an int and then do runtime checking that the limits were properly adhered to.

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