How to Handle Multiple Parameters in ASP.NET MVC Routing?

Multi-parameter routing in ASP.NET MVC

When creating an API using ASP.NET MVC, you often need to pass multiple parameters to action methods to retrieve or manipulate data. This article explores how to achieve this using the routing mechanism provided by MVC.

Use query string to pass parameters

By default, MVC supports passing parameters to action methods via query strings. The URL provided in the question, similar to the one below, uses this approach:

<code>http://ws.audioscrobbler.com/2.0/?method=artist.getimages&artist=cher&api_key=b25b959554ed76058ac220b7b2e0a026</code>

In MVC, the controller corresponds to "artist", the action corresponds to "getImages", and the "artist" and "api_key" query string parameters are automatically populated into the action method parameters.

Custom routing rules

While MVC supports basic parameter passing via query strings, it also allows for custom routing rules. This provides greater flexibility when dealing with more complex URL patterns.

Routing rules are defined in the global.asax file and follow a specific format. By default, they follow the following pattern:

<code>routes.MapRoute(
            "Default",                                              // 路由名称
            "{controller}/{action}/{id}",                           // 带参数的 URL
            new { controller = "Home", action = "Index", id = "" }  // 参数默认值
        );</code>

To support URL patterns such as "/Artist/GetImages/cher/api-key" a new route can be added:

<code>routes.MapRoute(
            "ArtistImages",                                              // 路由名称
            "{controller}/{action}/{artistName}/{apikey}",                           // 带参数的 URL
            new { controller = "Home", action = "Index", artistName = "", apikey = "" }  // 参数默认值
        );</code>

In this case, the "{artistName}" and "{apikey}" tags will be populated from the URL path, and the "artistName" and "apikey" parameters in the action method will be populated accordingly.

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