C#:限制方法参数中的类型(不是泛型参数) [英] C#: Restricting Types in method parameters (not generic parameters)

问题描述

我想编写如下函数

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

换句话说，参数类型是 System.Type，我想将允许的 Type 限制为从 MyClass.

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

有没有办法在语法上指定这个，或者 t 必须在运行时检查?

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

推荐答案

如果您的方法必须将 Type 类型作为参数，则没有办法做到这一点.如果您对方法调用有灵活性，您可以这样做:

If your method has to take a Type type as it's argument, there's no way to do this. If you have flexibility with the method call you could do:

public void Foo(MyClass myClass)

并通过调用.GetType()获取Type.

扩大一点.System.Type 是参数的类型，因此无法进一步指定应传递的内容.就像采用 1 到 10 之间的整数的方法一样，必须采用 int 并在运行时检查是否正确遵守了限制.

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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