c# 如何对方法签名中的泛型 Func 参数施加约束

Question

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

我收到错误，测试未定义类型参数 TController。 如何对财务总监施加约束？

Answer 1

除非你在SomeClass<TController>内部定义它(在这种情况下你需要在class SomeClass<TController>旁边放置约束(，否则你需要TController函数的泛型参数，即：

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

Answer 2

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
    {
        ...
    }