asp.net mvc 4 - Mvc: Create method to populate dropdown list from a class and call from controller -

-

the code below works in index controller action populates dropdownbox using database data.

i don't want use directly in controller because using dropdown in multiple places on page.

var db = new storemanagerentities();         var query = db.categories.select(c => new         {             categoryid = c.categoryid,             categoryname = c.categoryname,             isselected = c.categoryid.equals(0)         });          var model = new selectviewmodel         {             list = query.tolist()                         .select(c => new selectlistitem                         {                             value = c.categoryid.tostring(),                             text = c.categoryname,                             selected = c.isselected,                         })         };          return view(model);

i want able put code in method , call method controller here class want method go.

public class northwinddatacontext {      storemanagerentities mydb = new storemanagerentities();      //retrieve category objects     public list<category> getcategories()     {         return mydb.categories.tolist();     }      //populate dropdownbox         public void populatedropdown()         {               var query = db.categories.select(c => new         {             categoryid = c.categoryid,             categoryname = c.categoryname,             isselected = c.categoryid.equals(0)         });          var model = new selectviewmodel         {             list = query.tolist()                         .select(c => new selectlistitem                         {                             value = c.categoryid.tostring(),                             text = c.categoryname,                             selected = c.isselected,                         })         };          }   }    can please show me how can write method here , have    return data need controller. nice if    can show me how call controller well.

how change northwinddatacontext class 

public class northwinddatacontext     {         storemanagerentities mydb = new storemanagerentities();             //retrieve category objects         public list<category> getcategories()         {             return mydb.categories.tolist();         }             //populate dropdownbox         public selectviewmodel populatedropdown()         {             var query = db.categories.select(c => new                 {                     categoryid = c.categoryid,                     categoryname = c.categoryname,                     isselected = c.categoryid.equals(0)                 });              var model = new selectviewmodel             {                 list = query.tolist()                             .select(c => new selectlistitem                             {                                 value = c.categoryid.tostring(),                                 text = c.categoryname,                                 selected = c.isselected,                             })             };             return model;          }          }

notice change in return type of populatedropdown() , return model;

and use in controller like:

var db = new northwinddatacontext(); var model = db.populatedropdown();  return view(model);

Popular posts from this blog

How to calculate SNR of signals in MATLAB? -

-
i've encountered simple, yet fundamental problem on calculating snr: there several signals : s1 = original , pure clean signal without noise. n1 = white gaussian noise going added s1. s2 = s1 + n1 (the noisy signal before performing noise-reduction algorithm) s3 = noise-reduced signal (after performing noise reduction algorithm) n2 = s3 - s1 (the amount of noise after performing noise-reduction algorithm) now want compare snr before , after performing noise-reduction algorithm. which signals should consider snr_before!? s1/n1 or s2/n1 ? which signals should consider snr_after!? s3/n1 or s3/n2 ? which commands or functions should use in matlab in order compute snr_before , snr_after? thanks billion putting time on helping me. what know calculating snr before : snrbeforenoise = mean( signal .^ 2 ) / mean( noise .^ 2 ); and snr after : residual_noise = signal - noise_reduced_signal; snr_after = mean( signal .^ 2 ) / mean( residual_noise .^ 2
Read more

c# - Attempting to upload to FTP: System.Net.WebException: System error -

-
i have api takes in xml , uploads files based on information in xml. uploads on schedule (also xml), , have tested surrounding , know works. i getting error 40% of time on first file attempt upload in each time cycle (time cycle = 45 minutes files, 30 minutes others). here code upload: try { loggerftp.log("uploading file: " + filename, false); // create request. ftpwebrequest request = (ftpwebrequest)webrequest.create(appsettingsftp.ftpurl + @"/" + filename); request.method = webrequestmethods.ftp.uploadfile; request.timeout = 6000000; //set 100 minutes //request.timeout = -1; //set infinite // add login credentials. request.credentials = new networkcredential(appsettingsftp.ftplogin, appsettingsftp.ftppassword); // grab file contents. streamreader sourcestream = new streamreader(appsettingsftp.uploadfiledirectory + filename); byte[] filecontents = encoding.utf8.getbytes(sourcestream.readtoend()); sourcest
Read more

ios - UISlider customization: how to properly add shadow to custom knob image -

-
Image
i need place custom knob image shadow uislider. far have image of 38x38, of there region defines shadow of knob. now while using image, when slide knob extreme ends actual knob not able cover end points, hence end points visible under transparent region of knob image this code using customize uislider uiimage *slidebtimg = [uiimage imagenamed:sliderknobimg]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatenormal]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatehighlighted]; how can implement custom knob shadow beneath it, covering end points?? look inside uislider.h , there methods let customize slider knob , track needed. (ios 2.0 , above) // lets subclass lay out track , thumb needed - (cgrect)minimumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)maximumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)trackrectforbounds:(cgrect)bounds; - (cgrect)thumbrectforbounds:(cgrect)bounds trackrect:(cgrect)rect value:
Read more