自定义对象由MapRoutes定义的控制方法的参数 [英] Custom objects as arguments in controller methods defined by MapRoutes

问题描述

考虑一下这个图路线：

 图路线（
    的resultFormat
    {控制器} / {行动} / {ID} {}的resultFormat
    新{控制器=家，行动=索引，ID = 0，的resultFormat =json的}
）;
 

和它的控制器的方法：

 公众的ActionResult指数（的Int32 ID，字符串的resultFormat）
{
    变种DC =新Models.DataContext（）;    从dc.Messages那里m.MessageId == ID选择M M VAR消息=;    如果（的resultFormat ==JSON）
    {
        返回JSON（短信，JsonRequestBehavior.AllowGet）; // 2的情况下
    }
    其他
    {
        返回视图（消息）; // 情况1
    }
}
 

这里的URL方案

• 会去区分1


• 会去区分1


• 会去区分2

这工作得很好。但我讨厌检查字符串。将如何实施的枚举的被用作控制器方法的的resultFormat 参数？




有些伪code解释基本思想是：

 命名空间模型
{
    公共枚举的responseType
    {
        HTML = 0，
        JSON = 1，
        文字= 2
    }
}
 

该图路线：

 图路线（
    的resultFormat
    {控制器} / {行动} / {ID} {}的resultFormat
    新{
        控制器=家，
        行动=索引，
        ID = 0，
        的resultFormat = Models.ResultFormat.HTML
    }
）;
 

控制器方法签名：

 公众的ActionResult指数（的Int32 ID，Models.ResultFormat的resultFormat）
 

解决方案

这是我想出了ActionFilter：

 公共密封类AlternateOutputAttribute：
                    ActionFilterAttribute，IActionFilter
{
    无效IActionFilter.OnActionExecuted（ActionExecutedContext AEC）
    {
        的ViewResult VR = aec.Result为的ViewResult;        如果（VR == NULL）回报;        VAR AOF = ​​aec.RouteData.Values​​ [alternateOutputFormat]作为字符串;        如果（AOF ==JSON）aec.Result =新JsonResult
        {
            JsonRequestBehavior = JsonRequestBehavior.AllowGet，
            数据= vr.ViewData.Model，
            的ContentType =应用/ JSON
            ContentEncoding = Encoding.UTF8
        };
    }
}
 

Consider this MapRoute:

MapRoute(
    "ResultFormat",
    "{controller}/{action}/{id}.{resultFormat}",
    new { controller = "Home", action = "Index", id = 0, resultFormat = "json" }
);

And it's controller method:

public ActionResult Index(Int32 id, String resultFormat)
{
    var dc = new Models.DataContext();

    var messages = from m in dc.Messages where m.MessageId == id select m;

    if (resultFormat == "json")
    {
        return Json(messages, JsonRequestBehavior.AllowGet); // case 2
    }
    else
    {
        return View(messages); // case 1
    }
}

Here's the URL scenarios

• Home/Index/1 will go to case 1
• Home/Index/1.html will go to case 1
• Home/Index/1.json will go to case 2

This works well. But I hate checking for strings. How would implement an enum to be used as the resultFormat parameter in the controller method?


Some pseudo-code to explain the basic idea:

namespace Models
{
    public enum ResponseType
    {
        HTML = 0,
        JSON = 1,
        Text = 2
    }
}

The MapRoute:

MapRoute(
    "ResultFormat",
    "{controller}/{action}/{id}.{resultFormat}",
    new {
        controller = "Home",
        action = "Index",
        id = 0,
        resultFormat = Models.ResultFormat.HTML
    }
);

The controller method signature:

public ActionResult Index(Int32 id, Models.ResultFormat resultFormat)

解决方案

This is the ActionFilter I came up with:

public sealed class AlternateOutputAttribute :
                    ActionFilterAttribute, IActionFilter
{
    void IActionFilter.OnActionExecuted(ActionExecutedContext aec)
    {
        ViewResult vr = aec.Result as ViewResult;

        if (vr == null) return;

        var aof = aec.RouteData.Values["alternateOutputFormat"] as String;

        if (aof == "json") aec.Result = new JsonResult
        {
            JsonRequestBehavior = JsonRequestBehavior.AllowGet,
            Data = vr.ViewData.Model,
            ContentType = "application/json",
            ContentEncoding = Encoding.UTF8
        };
    }
}

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