是否有可能改变的查询字符串变量在ASP.NET MVC路径它击中控制器之前？ [英] Is it possible to change the querystring variable in ASP.NET MVC path before it hits the controller?

问题描述

我在ASP.NET MVC控制器方法是这样的：

I have a controller method in ASP.NET MVC that looks like this:

public ActionResult GetAlbumPictures(int albumId)
{
    var album = AlbumRepo.GetSingle(albumId);
    var pictures = album.Pictures;
    return View(pictures);
}

此方法的路由看起来是这样的：

The routing for this method looks like this:

routes.MapRoute(null,
                "pictures"
                new { controller = "Album", action = "GetAlbumPictures" });

用户将使用以下网址获得图片，由相册ID过滤：

The user will use the following URL to get the pictures, filtered by the album ID:

GET http://server/pictures?albumid=10

不过，我想改变查询参数只是专辑而不是 ALBUMID ：

GET http://server/pictures?album=10

这将意味着在控制器方法需要修改为：

This would mean that the controller method needs to be modified to:

public ActionResult GetPictures(int album)
{
    ...
}

不过，这并不理想，因为现在的方法有一个参数名为专辑，它可以被混淆为专辑 对象而不是 ID 的专辑。

However, this is not ideal because now the method has a parameter named album, which can be confused as an Album object instead of the ID of the Album.

我的问题是，是否有配置ASP.NET MVC使其在路由，它会收到名为专辑 A查询参数的任何方式，但随后将其传递该控制器为 ALBUMID 参数？

My question is, is there any way of configuring ASP.NET MVC so that in the routing, it will receive a querystring parameter called album, but then pass it off to the controller as the albumId parameter?

P.S 我知道我可以在路由表中做到这一点：

P.S. I know that I can do this in the routing table:

routes.MapRoute(null,
                "album/{albumId}/pictures",
                new { controller = "Album", action = "GetAlbumPictures" });

但由于历史遗留问题，我要使它成为查询字符串的方法正常工作。

But due to legacy issues, I have to make it work for the querystring method as well.

推荐答案

您可以创建自定义操作过滤器属性来处理这种情况。我没有测试此具体实施，但总的想法是做这样的事情：

You can create a custom action filter attribute to handle this scenario. I haven't tested this specific implementation, but the general idea is to do something like this:

public class AlbumAttribute : ActionFilterAttribute
    {
         public override void OnActionExecuting(ActionExecutingContext filterContext)
         {
             var albumId = filterContext.HttpContext.Request.QueryString["album"] as string;
             filterContext.ActionParameters["albumId"] = albumId;

             base.OnActionExecuting(filterContext);
         }
    }

然后，用[相册]属性修饰你的操作方法：

Then, decorate your action method with the [Album] attribute:

[Album]
public ActionResult GetAlbumPictures(int albumId)
{
    var album = AlbumRepo.GetSingle(albumId);
    var pictures = album.Pictures;
    return View(pictures);
}

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