获取具有给定返回类型的所有方法

Question

这段代码错了吗？它只是没有返回任何东西:

public IEnumerable<string> GetMethodsOfReturnType(Type cls, Type ret)
{
   var methods = cls.GetMethods(BindingFlags.NonPublic);
   var retMethods = methods.Where(m => m.ReturnType.IsSubclassOf(ret))
                           .Select(m => m.Name);
   return retMethods;
}

它返回一个空的枚举器.

注意:我在ASP.NET MVC Controller上调用它来寻找ActionResults

GetMethodsOfReturnType(typeof(ProductsController), typeof(ActionResult));

Answer 1

其他人已指出修复,但我想建议一个替代,IsSubclassOf以及包括公共方法:

public IEnumerable<string> GetMethodsOfReturnType(Type cls, Type ret)
{
   // Did you really mean to prohibit public methods? I assume not
   var methods = cls.GetMethods(BindingFlags.NonPublic | 
                                BindingFlags.Public |
                                BindingFlags.Instance);
   var retMethods = methods.Where(m => m.ReturnType.IsAssignableFrom(ret))
                           .Select(m => m.Name);
   return retMethods;
}

使用时IsAssignableFrom,您不需要额外的"返回类型与所需类型完全相同"测试,并且它也可以使用接口.