MVC routing - Query strings are not applied when default is present










1














I'm using this route config :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List", page = 1
);


Here is the controller method :



 public ViewResult List(string category, int page = 1)




However , if I use :



http://localhost:44123/chess?page=2


Then I see that page=1 ( not 2 , as I expected):



enter image description here



BTw - if I change the route to :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List"
);


Then I do see the right value:



enter image description here



Why is it happening ? all I wanted is to set a default value if I don't set a value
.
Why does setting a default value , prevents reading the query string value ?










share|improve this question

















  • 1




    Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
    – Hooman Bahreini
    Nov 10 at 23:52










  • @Hooman, That is not what OP is asking - you might consider retracting the close vote
    – user3559349
    Nov 11 at 2:21










  • @StephenMuecke, thanks... I thought this answer explains the problem...
    – Hooman Bahreini
    Nov 11 at 2:28















1














I'm using this route config :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List", page = 1
);


Here is the controller method :



 public ViewResult List(string category, int page = 1)




However , if I use :



http://localhost:44123/chess?page=2


Then I see that page=1 ( not 2 , as I expected):



enter image description here



BTw - if I change the route to :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List"
);


Then I do see the right value:



enter image description here



Why is it happening ? all I wanted is to set a default value if I don't set a value
.
Why does setting a default value , prevents reading the query string value ?










share|improve this question

















  • 1




    Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
    – Hooman Bahreini
    Nov 10 at 23:52










  • @Hooman, That is not what OP is asking - you might consider retracting the close vote
    – user3559349
    Nov 11 at 2:21










  • @StephenMuecke, thanks... I thought this answer explains the problem...
    – Hooman Bahreini
    Nov 11 at 2:28













1












1








1







I'm using this route config :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List", page = 1
);


Here is the controller method :



 public ViewResult List(string category, int page = 1)




However , if I use :



http://localhost:44123/chess?page=2


Then I see that page=1 ( not 2 , as I expected):



enter image description here



BTw - if I change the route to :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List"
);


Then I do see the right value:



enter image description here



Why is it happening ? all I wanted is to set a default value if I don't set a value
.
Why does setting a default value , prevents reading the query string value ?










share|improve this question













I'm using this route config :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List", page = 1
);


Here is the controller method :



 public ViewResult List(string category, int page = 1)




However , if I use :



http://localhost:44123/chess?page=2


Then I see that page=1 ( not 2 , as I expected):



enter image description here



BTw - if I change the route to :



 routes.MapRoute("Default23",
"category",
new controller = "Product", action = "List"
);


Then I do see the right value:



enter image description here



Why is it happening ? all I wanted is to set a default value if I don't set a value
.
Why does setting a default value , prevents reading the query string value ?







asp.net-mvc asp.net-mvc-routing






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 10 at 20:48









d11

1088




1088







  • 1




    Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
    – Hooman Bahreini
    Nov 10 at 23:52










  • @Hooman, That is not what OP is asking - you might consider retracting the close vote
    – user3559349
    Nov 11 at 2:21










  • @StephenMuecke, thanks... I thought this answer explains the problem...
    – Hooman Bahreini
    Nov 11 at 2:28












  • 1




    Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
    – Hooman Bahreini
    Nov 10 at 23:52










  • @Hooman, That is not what OP is asking - you might consider retracting the close vote
    – user3559349
    Nov 11 at 2:21










  • @StephenMuecke, thanks... I thought this answer explains the problem...
    – Hooman Bahreini
    Nov 11 at 2:28







1




1




Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
– Hooman Bahreini
Nov 10 at 23:52




Possible duplicate of How do I route a URL with a querystring in ASP.NET MVC?
– Hooman Bahreini
Nov 10 at 23:52












@Hooman, That is not what OP is asking - you might consider retracting the close vote
– user3559349
Nov 11 at 2:21




@Hooman, That is not what OP is asking - you might consider retracting the close vote
– user3559349
Nov 11 at 2:21












@StephenMuecke, thanks... I thought this answer explains the problem...
– Hooman Bahreini
Nov 11 at 2:28




@StephenMuecke, thanks... I thought this answer explains the problem...
– Hooman Bahreini
Nov 11 at 2:28












1 Answer
1






active

oldest

votes


















2














To explain the behavior, the 3rd argument of MapRoute is (my emphasis)




An object that contains default route values.




By specifying new controller = "Product", action = "List", page = 1 you are defining a route value for page (even though its not a segment in your url definition) and giving it a default value of 1.



Now when you navigate to ../chess?page=2 it matches your Default23 route, and the value of 'chess' is assigned to the category segment, but nothing is assigned to page because there is no segment for page (its a query string value).



When your List(string category, int page = 1) method is executed, the DefaultModelBinder evaluates values for binding in the following order



  1. Previously bound action parameters, when the action is a child
    action

  2. Form values

  3. JSON Request body (ajax calls)

  4. Route data

  5. Query string parameters

  6. Posted files

For a GET, 1, 2, 3 and 6 are not applicable, so the DefaultModelBinder first evaluates the Route data (RouteData.Values) and finds a value of "chess" for category (from the url). It also finds a value of "1" for page (because you defined a default value for it in the route definition).



At this point you have category="chess", page=1.



The DefaultModelBinder then evaluates the Query string parameters (Request.QueryString) and finds a value of "2" for page, but because page already has been set, its ignored. By default, the DefaultModelBinder binds the first match it finds and ignores all subsequent matches (unless binding to an IEnumerable property).



So at this point (the end of the binding process) you still have category="chess", page=1.






share|improve this answer




















  • So what if I want specify it conditionally via QS and still have a default value ?
    – d11
    Nov 11 at 6:59











  • You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
    – user3559349
    Nov 11 at 7:27










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














To explain the behavior, the 3rd argument of MapRoute is (my emphasis)




An object that contains default route values.




By specifying new controller = "Product", action = "List", page = 1 you are defining a route value for page (even though its not a segment in your url definition) and giving it a default value of 1.



Now when you navigate to ../chess?page=2 it matches your Default23 route, and the value of 'chess' is assigned to the category segment, but nothing is assigned to page because there is no segment for page (its a query string value).



When your List(string category, int page = 1) method is executed, the DefaultModelBinder evaluates values for binding in the following order



  1. Previously bound action parameters, when the action is a child
    action

  2. Form values

  3. JSON Request body (ajax calls)

  4. Route data

  5. Query string parameters

  6. Posted files

For a GET, 1, 2, 3 and 6 are not applicable, so the DefaultModelBinder first evaluates the Route data (RouteData.Values) and finds a value of "chess" for category (from the url). It also finds a value of "1" for page (because you defined a default value for it in the route definition).



At this point you have category="chess", page=1.



The DefaultModelBinder then evaluates the Query string parameters (Request.QueryString) and finds a value of "2" for page, but because page already has been set, its ignored. By default, the DefaultModelBinder binds the first match it finds and ignores all subsequent matches (unless binding to an IEnumerable property).



So at this point (the end of the binding process) you still have category="chess", page=1.






share|improve this answer




















  • So what if I want specify it conditionally via QS and still have a default value ?
    – d11
    Nov 11 at 6:59











  • You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
    – user3559349
    Nov 11 at 7:27















2














To explain the behavior, the 3rd argument of MapRoute is (my emphasis)




An object that contains default route values.




By specifying new controller = "Product", action = "List", page = 1 you are defining a route value for page (even though its not a segment in your url definition) and giving it a default value of 1.



Now when you navigate to ../chess?page=2 it matches your Default23 route, and the value of 'chess' is assigned to the category segment, but nothing is assigned to page because there is no segment for page (its a query string value).



When your List(string category, int page = 1) method is executed, the DefaultModelBinder evaluates values for binding in the following order



  1. Previously bound action parameters, when the action is a child
    action

  2. Form values

  3. JSON Request body (ajax calls)

  4. Route data

  5. Query string parameters

  6. Posted files

For a GET, 1, 2, 3 and 6 are not applicable, so the DefaultModelBinder first evaluates the Route data (RouteData.Values) and finds a value of "chess" for category (from the url). It also finds a value of "1" for page (because you defined a default value for it in the route definition).



At this point you have category="chess", page=1.



The DefaultModelBinder then evaluates the Query string parameters (Request.QueryString) and finds a value of "2" for page, but because page already has been set, its ignored. By default, the DefaultModelBinder binds the first match it finds and ignores all subsequent matches (unless binding to an IEnumerable property).



So at this point (the end of the binding process) you still have category="chess", page=1.






share|improve this answer




















  • So what if I want specify it conditionally via QS and still have a default value ?
    – d11
    Nov 11 at 6:59











  • You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
    – user3559349
    Nov 11 at 7:27













2












2








2






To explain the behavior, the 3rd argument of MapRoute is (my emphasis)




An object that contains default route values.




By specifying new controller = "Product", action = "List", page = 1 you are defining a route value for page (even though its not a segment in your url definition) and giving it a default value of 1.



Now when you navigate to ../chess?page=2 it matches your Default23 route, and the value of 'chess' is assigned to the category segment, but nothing is assigned to page because there is no segment for page (its a query string value).



When your List(string category, int page = 1) method is executed, the DefaultModelBinder evaluates values for binding in the following order



  1. Previously bound action parameters, when the action is a child
    action

  2. Form values

  3. JSON Request body (ajax calls)

  4. Route data

  5. Query string parameters

  6. Posted files

For a GET, 1, 2, 3 and 6 are not applicable, so the DefaultModelBinder first evaluates the Route data (RouteData.Values) and finds a value of "chess" for category (from the url). It also finds a value of "1" for page (because you defined a default value for it in the route definition).



At this point you have category="chess", page=1.



The DefaultModelBinder then evaluates the Query string parameters (Request.QueryString) and finds a value of "2" for page, but because page already has been set, its ignored. By default, the DefaultModelBinder binds the first match it finds and ignores all subsequent matches (unless binding to an IEnumerable property).



So at this point (the end of the binding process) you still have category="chess", page=1.






share|improve this answer












To explain the behavior, the 3rd argument of MapRoute is (my emphasis)




An object that contains default route values.




By specifying new controller = "Product", action = "List", page = 1 you are defining a route value for page (even though its not a segment in your url definition) and giving it a default value of 1.



Now when you navigate to ../chess?page=2 it matches your Default23 route, and the value of 'chess' is assigned to the category segment, but nothing is assigned to page because there is no segment for page (its a query string value).



When your List(string category, int page = 1) method is executed, the DefaultModelBinder evaluates values for binding in the following order



  1. Previously bound action parameters, when the action is a child
    action

  2. Form values

  3. JSON Request body (ajax calls)

  4. Route data

  5. Query string parameters

  6. Posted files

For a GET, 1, 2, 3 and 6 are not applicable, so the DefaultModelBinder first evaluates the Route data (RouteData.Values) and finds a value of "chess" for category (from the url). It also finds a value of "1" for page (because you defined a default value for it in the route definition).



At this point you have category="chess", page=1.



The DefaultModelBinder then evaluates the Query string parameters (Request.QueryString) and finds a value of "2" for page, but because page already has been set, its ignored. By default, the DefaultModelBinder binds the first match it finds and ignores all subsequent matches (unless binding to an IEnumerable property).



So at this point (the end of the binding process) you still have category="chess", page=1.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 11 at 2:15







user3559349


















  • So what if I want specify it conditionally via QS and still have a default value ?
    – d11
    Nov 11 at 6:59











  • You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
    – user3559349
    Nov 11 at 7:27
















  • So what if I want specify it conditionally via QS and still have a default value ?
    – d11
    Nov 11 at 6:59











  • You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
    – user3559349
    Nov 11 at 7:27















So what if I want specify it conditionally via QS and still have a default value ?
– d11
Nov 11 at 6:59





So what if I want specify it conditionally via QS and still have a default value ?
– d11
Nov 11 at 6:59













You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
– user3559349
Nov 11 at 7:27




You have already defined a default in the List() method (i.e. int page = 1) so if you omit page = 1 from the route definition navigate to .../chess, (i.e. no query string) then the value of page will be page=1
– user3559349
Nov 11 at 7:27

















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