c#如何对方法签名中的泛型Func参数设置约束

Question

public void Test<TFeature>(Func<TController, ViewResult> controllerAction)                                          
            where TController : IController
            where TFeature : ISecurityFeature
        {
            ...
        }

我收到错误,Test没有定义类型参数TController.如何在TController上设置约束？

Answer 1

您还需要将TController添加为通用参数

public void Test<TFeature, TController>(Func<TController, ViewResult> controllerAction)                                          
        where TController : IController
        where TFeature : ISecurityFeature
    {
        ...
    }

Answer 2

除非你在里面定义它SomeClass<TController>(在这种情况下你需要将约束放在旁边class SomeClass<TController>),你需要为TController你的函数创建一个泛型参数,即:

public void Test<TFeature, TController>(Func<TController, ViewResult> controllerAction)                                          
            where TController : IController
            where TFeature : ISecurityFeature
        {
            ...
        }