c# - Async Delegates Callback Pattern leveraging Func -

all -

i have sample code async delegates utilizes callback pattern. using standard delegates , code below works fine. wanted convert func delegates (since expecting , int , returning int) reason - seem stuck. can please help.

class program {     public delegate int somedelegate(int x);      static void main(string[] args)     {         console.writeline("this callback pattern technique asynchronous delegates in threading");         console.writeline("");         somedelegate sd = squarenumber;         console.writeline("[{0}] before squarenumber method invoked.", thread.currentthread.managedthreadid);         iasyncresult asyncres = sd.begininvoke(10, new asynccallback(callbackmethod), null);         console.writeline("[{0}] in main after squarenumber method invoked. doing processing.", thread.currentthread.managedthreadid);         console.writeline("[{0}] main method processing completed.", thread.currentthread.managedthreadid);         console.readline();     }      static int squarenumber(int a)     {         console.writeline("[{0}] inside squarenumber  - invoked. processing......", thread.currentthread.managedthreadid);         thread.sleep(5000);         return * a;     }      static void callbackmethod(iasyncresult asyncres)     {         console.writeline("[{0}] callback invoked", thread.currentthread.managedthreadid);         asyncresult ares = (asyncresult)asyncres;         somedelegate delg = (somedelegate)ares.asyncdelegate;         int res = delg.endinvoke(asyncres);         console.writeline("[{1}] result = {0}", res, thread.currentthread.managedthreadid);     } } 

thanks

class program     {         //public delegate int somedelegate(int x);          static void main(string[] args)         {             console.writeline("this callback pattern technique asynchronous delegates in threading");             console.writeline("");             func<int,int> sd = squarenumber;             console.writeline("[{0}] before squarenumber method invoked.", thread.currentthread.managedthreadid);             iasyncresult asyncres = sd.begininvoke(10, new asynccallback(callbackmethod), null);             console.writeline("[{0}] in main after squarenumber method invoked. doing processing.", thread.currentthread.managedthreadid);             console.writeline("[{0}] main method processing completed.", thread.currentthread.managedthreadid);             console.readline();         }          static int squarenumber(int a)         {             console.writeline("[{0}] inside squarenumber  - invoked. processing......", thread.currentthread.managedthreadid);             thread.sleep(5000);             return * a;         }          static void callbackmethod(iasyncresult asyncres)         {             console.writeline("[{0}] callback invoked", thread.currentthread.managedthreadid);             asyncresult ares = (asyncresult)asyncres;             func<int,int> delg = (func<int,int>)ares.asyncdelegate;             int res = delg.endinvoke(asyncres);             console.writeline("[{1}] result = {0}", res, thread.currentthread.managedthreadid);         }     } 

works me.