具有多个约束的通用方法 [英] Generic method with multiple constraints

问题描述

我有一个通用方法，它有两个通用参数.我试图编译下面的代码，但它不起作用.它是 .NET 限制吗?是否可以对不同的参数有多个约束?

I have a generic method which has two generic parameters. I tried to compile the code below but it doesn't work. Is it a .NET limitation? Is it possible to have multiple constraints for different parameter?

public TResponse Call<TResponse, TRequest>(TRequest request)
  where TRequest : MyClass, TResponse : MyOtherClass

推荐答案

这是可能的，只是你的语法有点错误.您需要一个 where 用于每个约束，而不是用逗号分隔它们:

It is possible to do this, you've just got the syntax slightly wrong. You need a where for each constraint rather than separating them with a comma:

public TResponse Call<TResponse, TRequest>(TRequest request)
    where TRequest : MyClass
    where TResponse : MyOtherClass

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