need help accessing data coming off a callback C# .NET -

i'm @ wits end trying solve issue.

i have function in class such

public class receivedata {     dataprovider provider = new dataprovider();      public void responsedata()     {         foreach(string anitem in thelist)         {             // alldata function declared in class dataprovider             string result = provider.alldata(anitem);          }          //do     } } 

that's simple. however, if alldata function had make async function calls data?

meaning, say

public class dataprovider  {     myserviceclient client = new myserviceclient();      public string alldata (string  myitem)     {         client.formatteddatacompleted += new eventhandler<formatteddatacompletedeventargs>(client_formatteddatacompleted);         client.formatteddataasync(myitem);     }      void client_formatteddatacompleted(object sender, formatteddatacompletedeventargs e)     {         // here's response comes back.     } 

as can see, cant call alldata function , directly data back.

so, have in responsedata function make sure call allitem function, , data callback. notice there's loop in function, need parameters have sent through loop gets respective response.

one approach tried using autoresetevent class.

i defined handler autoresetevent handle = new autoresethandle(false);

then add handle.waitone() right after async call. , on callback, added handle.set();

however, applications stuck @ handle.waitone(). can't see why happens.

i have theoritical idea see if have event raiser on callback, , eventlistener in recievedata class, , if 2 communicate, data. i've spent time trying learn more event handlers, haven't gotten hang of it.

so have other approach, ideas? thanks!

welcome asynchronous model. have re-think how call methods when go multithreaded.

you have options:

• split method in you're making call 2 halves; in first half, call alldata, else can possibly without having response object, , exit current method. when async call completes, it'll call handler, should perform operations original method require response.

• in event handler async call completion, set property indicates call completed, , put data out on property somewhere well. in function kicks off call, @ point cannot continue execution until call completes, wait in while loop call complete polling property , breaking once indicates call has been completed (you'll want thread.yield() in loop you'll call when haven't gotten response yet, make sure aren't blocking other threads doing more important things waiting)

• wrap asynchronous call in class exposes synchronous method. wrapper class have similar logic integrating async call method. make call, wait response, , return response if normal synchronous method call.

remember asynchronous call giving calling thread opportunity other work while call performed. take full advantage of if @ possible.