webapi 通过反射获取Controller里的类名，方法名，参数列表，返回值类型，Description描述，自定义Attribute等

/// <summary>
        /// 获取所有的action
        /// </summary>
        /// <returns></returns>

        public HttpResponseMessage GetActionList()
        {
            List<ActionModel> actionModels = new List<ActionModel>();
            // 获取区域名称，限制Areas后面跟区域，不允许再深入
            string areaName = string.Empty;
            object[] attrs;
            // 获取当前运行的程序集的反射对象
            var assembly = Assembly.GetExecutingAssembly();

            // 所有类型的集合
            foreach (var type in assembly.GetTypes())
            {
                // 不属于controller的跳过
                if (!typeof(ApiController).IsAssignableFrom(type)) continue;

                // 处理Areas，无法直接获取到区域名称，只能根据命名空间处理
                string[] namespaceSplit = type.Namespace.Split('.');
                for (int i = 0; i < namespaceSplit.Length; i++)
                {
                    if (namespaceSplit[i] == "Areas") areaName = namespaceSplit[i + 1];
                }

                foreach (var member in type.GetMembers())
                {
                    // 不是方法时，跳过
                    if (member.MemberType != MemberTypes.Method) continue;
                    //去除不需要的方法
                    if (member.DeclaringType.Name.Contains("ApiController") || member.DeclaringType.Name.Contains("Object")) continue;
                    // member.ReturnType，调试时可以看到，但实际是没有ReturnType属性的，所以采用以下判断
                    // 方法返回值为Void的跳过
                    if (member.ToString().IndexOf("Void") == 0) continue;

                    //获取方法说明
                    attrs = member.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), true);
                    actionModels.Add(new ActionModel
                    {
                        AreaName = areaName,
                        ControllerName = type.Name.Replace("Controller", ""),
                        ActionName = member.Name,
                        Describe = attrs.Length > 0 ? (attrs[0] as System.ComponentModel.DescriptionAttribute).Description : ""
                    });
                }
            }
            return JsonManager.GetSuccess(actionModels);
        }

/// <summary>
    /// action model
    /// </summary>
    public class ActionModel
    {
        public string AreaName { get; set; }
        public string ControllerName { get; set; }
        public string ActionName { get; set; }
        public string Describe { get; set; }
    }

参考：https://blog.csdn.net/weixin_34038652/article/details/85579455?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param