c# - Best practice, create interface of WebRequest -

if create interface of system.net.webrequest, what's best way that?

to david's point, first need determine want interface before can decide members needs. if want interface unit testing, recommend separate approach. take @ answer votes this question.

however, answer question strictly asked, since can't modify webrequest class, you'd first want subclass so:

public class mywebrequest : webrequest, imywebrequest { } 

you add of public members exposed webrequest imywebrequest (remove members don't want exposed):

public interface imywebrequest {     stream getrequeststream();     webresponse getresponse();     iasyncresult begingetresponse(asynccallback callback, object state);     webresponse endgetresponse(iasyncresult asyncresult);     iasyncresult begingetrequeststream(asynccallback callback, object state);     stream endgetrequeststream(iasyncresult asyncresult);     void abort();     requestcachepolicy cachepolicy { get; set; }     string method { get; set; }     uri requesturi { get; }     string connectiongroupname { get; set; }     webheadercollection headers { get; set; }     long contentlength { get; set; }     string contenttype { get; set; }     icredentials credentials { get; set; }     bool usedefaultcredentials { get; set; }     iwebproxy proxy { get; set; }     bool preauthenticate { get; set; }     int timeout { get; set; }     authenticationlevel authenticationlevel { get; set; }     tokenimpersonationlevel impersonationlevel { get; set; }     object getlifetimeservice();     object initializelifetimeservice();     objref createobjref(type requestedtype); }