c# - Why does empty controllerName property work when the default action is empty? -

-

i reading on urls , routes chapter in pro asp.net mvc 3 , tried see happens when object defaults contain empty values. route have @ moment.

routes.maproute("myroute", "{controller}/{action}",      new { controller="home", action="index" });

following observations made possible combinations of values of object defaults. (in each case, urls in bold not accessible.)

case 1

new { controller="home", action="index" });
  1. http://mywebapp.net/
  2. http://mywebapp.net/home/
  3. http://mywebapp.net/home/index/

case 2

new { controller="home", action="" });
  1. http://mywebapp.net/
    error: routedata must contain item named 'action' non-empty string value.
  2. http://mywebapp.net/home/
    error: routedata must contain item named 'action' non-empty string value.
  3. http://mywebapp.net/home/index/

the above error 2nd url because routing system couldn't find default action name.

case 3

new { controller="", action="" });
  1. http://mywebapp.net/
    error: value cannot null or empty. parameter name: controllername
  2. http://mywebapp.net/home/
    error: routedata must contain item named 'action' non-empty string value.
  3. http://mywebapp.net/home/index/

the above error 1st , 2nd urls because routing system couldn't find default controller , action names respectively.

case 4

new { controller="", action="index" });
  1. http://mywebapp.net/
    error: value cannot null or empty. parameter name: controllername
  2. http://mywebapp.net/home/ (how , why accessible?)
  3. http://mywebapp.net/home/index/

when both controller , action properties empty in case 3, received errors expected. in case 4, how 2nd url http://mywebapp.net/home/ accessible when have empty value controller property?

is simple 2nd url being accessible because homecontroller defined , routing system found convention or there explanation behavior? can modified let 2nd url inaccessible or violate convention-over-configuration principle?

home , index not hardcoded conventions, unless specify them defaults runtime won't attempt find them.

case 2.1 not work because url did not contain value action parameter, , there's no action default.

case 4.1 not work because url did not contain value controller parameter, , there's no controller default.

i recommend this post if want more details how routing works.


Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c# - Copy ObservableCollection to another ObservableCollection -

-
how copy observablecollection item observablecollection without reference of first collection? here observablecollection item value changes affecting both collections. code private observablecollection<ratemodel> _allmetalrate = new observablecollection<ratemodel>(); private observablecollection<ratemodel> _metalrateondate = new observablecollection<ratemodel>(); public observablecollection<ratemodel> allmetalrate { { return this._allmetalrate; } set { this._allmetalrate = value; notifypropertychanged("metalrate"); } } public observablecollection<ratemodel> metalrateondate { { return this._metalrateondate; } set { this._metalrateondate = value; notifypropertychanged("metalrateondate"); } } foreach (var item in metalrateondate) allmetalrate.add(item); what causing , how can solve it? you need clone object referenced item before it's a...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more