Asp.net MVC Route class that supports catch-all parameter anywhere in the URL

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广开言路
广开言路 2021-02-01 10:47

the more I think about it the more I believe it\'s possible to write a custom route that would consume these URL definitions:

{var1}/{var2}/{var3}
Const/{var1}/{         


        
2条回答
  •  暗喜
    暗喜 (楼主)
    2021-02-01 11:20

    Well. It cannot be in default hierarchy. 'cause, Routing layer splitted from actions. You cannot manipulate parameter bindings. You have to write new ActionInvoker or have to use RegEx for catching.

    Global.asax:

    routes.Add(new RegexRoute("Show/(?.*)/(?[\\d]+)/(?.*)", 
        new { controller = "Home", action = "Index" }));
    
    public class RegexRoute : Route
    {
        private readonly Regex _regEx;
        private readonly RouteValueDictionary _defaultValues;
    
        public RegexRoute(string pattern, object defaultValues)
            : this(pattern, new RouteValueDictionary(defaultValues))
        { }
    
        public RegexRoute(string pattern, RouteValueDictionary defaultValues)
            : this(pattern, defaultValues, new MvcRouteHandler())
        { }
    
        public RegexRoute(string pattern, RouteValueDictionary defaultValues, 
            IRouteHandler routeHandler)
            : base(null, routeHandler)
        {
            this._regEx = new Regex(pattern);
            this._defaultValues = defaultValues;
        }
    
        private void AddDefaultValues(RouteData routeData)
        {
            if (this._defaultValues != null)
            {
                foreach (KeyValuePair<string, object> pair in this._defaultValues)
                {
                    routeData.Values[pair.Key] = pair.Value;
                }
            }
        }
    
        public override RouteData GetRouteData(System.Web.HttpContextBase httpContext)
        {
            string requestedUrl = 
                httpContext.Request.AppRelativeCurrentExecutionFilePath.Substring(2) + 
                httpContext.Request.PathInfo;
            Match match = _regEx.Match(requestedUrl);
    
            if (match.Success)
            {
                RouteData routeData = new RouteData(this, this.RouteHandler);
                AddDefaultValues(routeData);
    
                for (int i = 0; i < match.Groups.Count; i++)
                {
                    string key = _regEx.GroupNameFromNumber(i);
                    Group group = match.Groups[i];
                    if (!string.IsNullOrEmpty(key))
                    {
                        routeData.Values[key] = group.Value;
                    }
                }
    
                return routeData;
            }
    
            return null;
        }
    }
    </code></pre>
    
    <p>Controller:</p>
    
    <pre><code>    public class HomeController : Controller
        {
            public ActionResult Index(string topics, int id, string title)
            {
                string[] arr = topics.Split('/')
            }
        }
    </code></pre>
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