asp.net mvc - AttributeRouting - Correct way of Getting the Action Name from RouteData -

i have started using attribute routing action methods , struggling in getting action name (and/or id) routedata. below example of how use attrubues so:

[route( "edit/{id:int}" )] public actionresult edit( int id ) {     ... } 

previously used following method extension of routedata retrieve value

public static string getactionname( routedata routedata ) {     return routedata.values[ "action" ] string; } 

this used return action name (in example "edit"). alway returns null. inspection of routedata dictionary shows these values seem no longer placed in root of array rather in item keyed "[0] = "ms_directroutematches".

i able access value in following manner due limited understanding of how these values populated concerned that, e.g. routes there more 1 match, code fall on in cases.

public static string getactionname( routedata routedata ) {     if( routedata.values.containskey( "ms_directroutematches" ) )         routedata = ( ( ilist<routedata> )routedata.values[ "ms_directroutematches" ] )[ 0 ];      return routedata.values[ "action" ] string; } 

what correct way access routedata values populated attributerouting?

your solution work in 1 case. possible request not match route, should ensure action key exists before return it, or may exception.

public static string getactionname( routedata routedata ) {     if( routedata.values.containskey( "ms_directroutematches" ) )         routedata = ( ( ienumerable<routedata> )routedata.values["ms_directroutematches"] )[0];      return routedata.values.containskey("action") ?          routedata.values["action"] string :          string.empty; } 

that 1 case typically passes request iis can return 404 page (or custom 1 if configured), , covers custom 404 page case.

i change ilist ienumerable, since adding nothing list in method.

there no such thing request matches more 1 route (0 or 1 route possibilities). in case there no match, ms_directroutematches not exist. in case exist, there 1 value in collection.

unfortunately, there aren't guarantees number of values in collection won't change more 1 in future version, holds true. since there isn't more robust way determine action name this, stuck until next breaking change.