MVC5 - 如何为动作参数类型定义反序列化行为？(MVC5 - How do I define deserialization behavior for action parameter type?)

    public class LogsController : Controller
    {
        public async Task<ActionResult> User(string id, int? page)
        {
            return await User(id, (Page)page);
        }

        private async Task<ActionResult> User(string id, Page page)
        {
            var data = await Repo.GetData(id, page, 10);
            var model = new UserLogs
            {
                User = id,
                Events = data,
                Pager = new PagerInput(page, 10, data.TotalCount)
            };

            return View("UserGrid", model);
        }
    }
 
 我的Page类提供了有用的功能，例如确保页面永远不会小于1，等等。 但是，如果我的公共操作将Page作为参数，它始终为null，无论表单或查询字符串中的值是什么，即使我已经定义了与int之间的隐式强制转换。 
 
 无论如何，我可以告诉MVC如何反序列化页面类型？ 这样提供某种方法/ ctor从字符串转换？ 
 
 我想在实际的页面类型上定义它，因为我将在多个控制器/动作中使用它。 
 
 我很高兴不需要双动作定义。 

    public class LogsController : Controller
    {
        public async Task<ActionResult> User(string id, int? page)
        {
            return await User(id, (Page)page);
        }

        private async Task<ActionResult> User(string id, Page page)
        {
            var data = await Repo.GetData(id, page, 10);
            var model = new UserLogs
            {
                User = id,
                Events = data,
                Pager = new PagerInput(page, 10, data.TotalCount)
            };

            return View("UserGrid", model);
        }
    }
 
My Page class provides useful functionality such as making sure the page is never less than 1, ect. However, if my public action takes Page as a parameter, it is always null, no matter the value in the form or querystring, even though I have defined implicit casts to and from int.
 
Is there anyway I can tell the MVC how to deserialize a Page type? Such a providing some sort of method/ctor to convert from string?
 
I would like to define it on the actual Page type since I will be using it in multiple controllers/actions.
 
I would be nice to not need the double action definition.

原文：https://stackoverflow.com/questions/44338006