Use C# HttpWebRequest to send json data to web service -

i trying send http request of json data web service. directed web service data null...

here web service:

public bool checkuserexist ([frombody] string email)     {         list<user> all_users = repo.getusers();         var match = all_users.find(i => i.email == email);         if (match == null)         {             return false;         }         else         {             return true;         }     } 

and here http request:

var webaddr = "http://localhost:59305/api/user/checkuserexist"; var httpwebrequest = (httpwebrequest)webrequest.create(webaddr); httpwebrequest.contenttype = "application/json; charset=utf-8"; httpwebrequest.method = "post"; using (var streamwriter = new streamwriter(httpwebrequest.getrequeststream()))                 {                     string json = "{\"email\":\"email\"}";                     streamwriter.write(json);                     streamwriter.flush();                 } var httpresponse = (httpwebresponse)httpwebrequest.getresponse(); using (var streamreader = new streamreader(httpresponse.getresponsestream()))                 {                     var result = streamreader.readtoend();                     return redirecttoaction("index");                 } 

as mentioned...iam using debugger @ web service function...the request directed service variable "email" null

the quick fix change posting. if want api endpoint work [frombody] string email, should change "json":

string json = "\"a@b.c\""; streamwriter.write(json); streamwriter.flush(); 

however, may want consider few other changes long term on approach:

• let repo return iqueryable instead of list or other ienumerable. written, return every user database. linq, can leverage lazy initialization , let query matching user instead of every user , find match. not scale well.
• use new httpclient , async functionality in action instead of httpwebrequest
• instead of manually building json, let .net work , create class gets serialized

with above solutions in place (except first since didn't post data context, didn't want make many assumptions), here examples started:

define shared user search class (shared either in same project or shared dll)

public class usersearch {     public string email { get; set; } } 

let web api map post against search class

public bool checkuserexist([frombody] usersearch usersearch) {     iqueryable<user> all_users = repo.getusers();     var ismatch = all_users.any(i => i.email == usersearch.email);     return ismatch; } 

change httpclient , use async send api request new search class

public async task<actionresult> check() {     using (var client = new httpclient())     {         var search = new usersearch() { email = "a@b.c" };         var response = await client.postasjsonasync("http://localhost:59305/api/user/checkuserexist", search);         if (response.issuccessstatuscode)         {             bool exists = await response.content.readasasync<bool>();             // handle exists             return redirecttoaction("index");         }         else         {             // handle unsuccessful call             throw new exception("application error");         }      } }