Example code for sending HTTP requests asynchronously in C # details

HTTP Asynchronous request

AsyncHttpRequestHelperV2.cs

Using system;using system.collections.generic;using system.linq;using system.text;using Imps.Services.CommonV4; Using system.diagnostics;using system.net;using system.io;namespace imps.services.idcservice.utility{public class AysncHttpRequestHelperV2 {public static readonly itracing _logger = tracingmanager.gettracing (typeof (AYSNCHTTPR        equestHelperV2));        Private Asynhttpcontext _context;        Private byte[] buffer;        Private Const INT DEFAULT_LENGTH = 1024 * 512;        Private Const INT DEFAULT_POS_LENGTH = 1024 * 16;        private bool Notcontentlength = false;        Private Action<asynhttpcontext, exception> _action;        Private Stopwatch _watch = new Stopwatch ();        Private byte[] requestbytes; Private AysncHttpRequestHelperV2 (HttpWebRequest request, Action<asynhttpcontext, exception> callBack): t His (new Asynhttpcontext (Request), CallBack) {} private AysncHttpRequestHelperV2 (Asynhttpcontext contExt, Action<asynhttpcontext, exception> callBack) {this._context = context;            This._action = CallBack;        This._watch = new Stopwatch ();            public static void Get (HttpWebRequest request, Action<asynhttpcontext, exception> callBack) {            AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2 (request, callBack); Proxy.        SendRequest ();            public static void Get (Asynhttpcontext context, Action<asynhttpcontext, exception> callBack) {            AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2 (context, callBack); Proxy.        SendRequest (); public static void Post (HttpWebRequest request, byte[] reqbytes, Action<asynhttpcontext, exception> Callbac            k) {AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2 (request, callBack); Proxy.        SendRequest (reqbytes); } public static void Post (Asynhttpcontext context, byte[] reqbytes, Action<asynhttpcontext, exception> callBack) {Aysnchttprequesthel            PerV2 proxy = new AysncHttpRequestHelperV2 (context, callBack); Proxy.        SendRequest (reqbytes);         public static void Post (HttpWebRequest request, String reqstr, Action<asynhttpcontext, exception> callBack)            {AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2 (request, callBack); Proxy.        SendRequest (Encoding.UTF8.GetBytes (REQSTR)); public static void Post (Asynhttpcontext context, String reqstr, Action<asynhttpcontext, exception> callBack            {AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2 (context, callBack); Proxy.        SendRequest (Encoding.UTF8.GetBytes (REQSTR)); }///<summary>//For HTTP GET//</summary>//<param name= "req" >httpwebr equest</param>//<param name= "action" &Gt;</param> private void SendRequest () {try {_watch.                               Start (); _context.                RequestTime = DateTime.Now; IAsyncResult AsyncResult = _context.            Asynrequest.begingetresponse (requestcompleted, _context); } catch (Exception e) {_logger.                Error (E, "Send request exception.");            EndInvoke (_context, E); }}///<summary>//For post///</summary>//<param name= "req" >htt pwebrequest</param>//<param name= "reqbytes" >post bytes</param>//<param name= "Acti                On ">call back</param> private void SendRequest (byte[] reqbytes) {try { _watch.                Start ();                Requestbytes = reqbytes; _context.                Asynrequest.method = "POST"; _context.  RequestTime = DateTime.Now;              IAsyncResult AsyncRead = _context. Asynrequest.begingetrequeststream (Asyngetrequestcallback, _context.            Asynrequest); } catch (Exception e) {_logger.                Error (E, "Send request exception.");            EndInvoke (_context, E);                }} private void Asyngetrequestcallback (IAsyncResult asyncread) {try {                HttpWebRequest request = asyncread.asyncstate as HttpWebRequest; Stream requeststream = Request.                EndGetRequestStream (AsyncRead);                requestStream.Write (requestbytes, 0, requestbytes.length);                Requeststream.close ();            SendRequest (); } catch (Exception e) {_logger.                Error (E, "Getrequestcallback exception.");            EndInvoke (_context, E); }} private void AsynGetRequestCallBack2 (IAsyncResult asyncread) {try {               HttpWebRequest request = asyncread.asyncstate as HttpWebRequest; Stream requeststream = Request.                EndGetRequestStream (AsyncRead);            Requeststream.beginwrite (requestbytes, 0, Requestbytes.length, Endstreamwrite, requeststream); } catch (Exception e) {_logger.                Error (E, "Getrequestcallback exception.");            EndInvoke (_context, E);                }} private void Endstreamwrite (IAsyncResult asyncwrite) {try {                Stream requeststream = asyncwrite.asyncstate as Stream;                Requeststream.endwrite (AsyncWrite);                Requeststream.close ();            SendRequest (); } catch (Exception e) {_logger.                Error (E, "Getrequestcallback exception.");            EndInvoke (_context, E);      }} private void requestcompleted (IAsyncResult asyncResult) {      Asynhttpcontext _context = asyncresult.asyncstate as Asynhttpcontext;                try {if (AsyncResult = = null) return; _context. Asynresponse = (HttpWebResponse) _context.            Asynrequest.endgetresponse (AsyncResult); } catch (WebException e) {_logger.                Error (E, "requestcompleted webexception."); _context.                Asynresponse = (HttpWebResponse) e.response; if (_context.                    Asynresponse = = null) {EndInvoke (_context, E);                Return }} catch (Exception e) {_logger.                Error (E, "requestcompleted exception.");                EndInvoke (_context, E);            Return try {asynstream stream = new Asynstream (_context.                Asynresponse.getresponsestream ()); Stream.                Offset = 0; Long length = _context. AsyNresponse.contentlength;                    if (length < 0) {length = Default_length;                Notcontentlength = true;                } buffer = new Byte[length]; Stream. unreadlength = buffer.                Length; IAsyncResult AsyncRead = stream.NetStream.BeginRead (buffer, 0, stream.            Unreadlength, New AsyncCallback (Readcallback), stream); } catch (Exception e) {_logger.                Error (E, "BeginRead exception.");            EndInvoke (_context, E);                }} private void Readcallback (IAsyncResult asyncResult) {try {                Asynstream stream = asyncresult.asyncstate as Asynstream;                int read = 0; if (stream.                Unreadlength > 0) Read = Stream.NetStream.EndRead (AsyncResult); if (Read > 0) {stream.         Offset + = read;           Stream.                    Unreadlength-= read; Stream.                    count++; if (Notcontentlength && stream. Offset >= buffer. Length) {array.resize<byte> (ref buffer, stream.                        Offset + default_pos_length); Stream.                    Unreadlength = Default_pos_length; } IAsyncResult AsyncRead = stream.NetStream.BeginRead (buffer, stream. Offset, Stream.                Unreadlength, New AsyncCallback (Readcallback), stream); } else {_watch.                    Stop ();                    Stream.NetStream.Dispose (); if (buffer. Length! = stream. Offset) array.resize<byte> (ref buffer, stream.                    Offset); _context. Exectime = _watch.                    Elapsedmilliseconds; _context.                    Setresponsebytes (buffer); _action.                Invoke (_context, NULL);           }            } catch (Exception e) {_logger.                Error (E, "Readcallback exception.");            EndInvoke (_context, E);                }} private void EndInvoke (Asynhttpcontext _context, Exception e) {try { _watch.                Stop (); _context. Exectime = _watch.                Elapsedmilliseconds; _action.            Invoke (_context, E); } catch (Exception ex) {_logger.                Error (ex, "EndInvoke exception."); _action.            Invoke (null, ex); }        }    }}

AsyncHttpContext.cs

Using system;using system.collections.generic;using system.linq;using system.text;using System.Net;namespace asynchttprequestdemo{public enum Asynstatus {Begin, TimeOut, runing, completed} public class Asynhttpcontext:id        isposable {private HttpWebRequest _asynrequest;        Private HttpWebResponse _asynresponse;        Private DateTime _requesttime;        Private long _exectime;        BOOL isdisposable = false;        Private byte[] _rspbytes;            Public long Exectime {get {return _exectime;}        set {_exectime = value;}        } public byte[] ResponseBytes {get {return _rspbytes;}        } public HttpWebRequest Asynrequest {get {return _asynrequest;}            } public HttpWebResponse Asynresponse {get {return _asynresponse;}        set {_asynresponse = value;} } public DateTime RequestTime {get {return _requeSttime;        } set {_requesttime = value;} } private Asynhttpcontext () {} public Asynhttpcontext (HttpWebRequest req) {_asynrequest        = req;        } public void Setresponsebytes (byte[] bytes) {_rspbytes = bytes;            public void Dispose () {Dispose (true); Gc.        SuppressFinalize (this);            } public void OnTimeOut () {if (_asynrequest! = null) _asynrequest.abort (); This.        Dispose (); } private void Dispose (bool disposing) {if (!isdisposable) {if (Dispo                    Sing) {if (_asynrequest! = null) _asynrequest.abort ();                if (_asynresponse! = null) _asynresponse.close ();        }} isdisposable = true; } ~asynhttpcontext () {DisPose (false); }    }}

AsyncStream.cs

Using system;using system.collections.generic;using system.linq;using system.text;using System.IO;namespace        asynchttprequestdemo{public class Asynstream {int _offset; <summary>///offset///</summary> public int Offset {get {return _ _ Offset        } set {_offset = value;}        } int _count; <summary>///read///</summary> public int Count {get {return _ _ Count        } set {_count = value;}        } int _unreadlength; <summary>///No Read length///</summary> public int Unreadlength {get            {return _unreadlength;}        set {_unreadlength = value;}            } public asynstream (int offset, int count, Stream netStream) {_offset = offset;            _count = count;        _netstream = NetStream; } Public Asynstream (STream netStream) {_netstream = NetStream;        } Stream _netstream;            Public Stream NetStream {get {return _netstream;}        set {_netstream = value;} }    }}

Called:

  action<string, exception> onresponseget = new action<string, exception> ((S, ex) = { if (ex! = null) {string exinfo = ex.                Message;            } string ret = S;            });                try {string strrequestxml = "Hello";                int timeout = 15000;                String contentType = "Text/xml";                String url = "http://192.168.110.191:8092/getcontentinfo/";                UTF8Encoding encoding = new UTF8Encoding (); byte[] data = encoding.                GetBytes (Strrequestxml);                HttpWebRequest myhttpwebrequest = (HttpWebRequest) webrequest.create (URL);                Myhttpwebrequest.timeout = Timeout;                Myhttpwebrequest.method = "POST";                Myhttpwebrequest.contenttype = ContentType; Myhttpwebrequest.contentlength = data.                Length; if (headers! = null && headers. Count &GT        0)//{//foreach (var eachheader in headers)//{// MYHTTPWEBREQUEST.HEADERS.ADD (Eachheader. Key, Eachheader.                Value); }//} Asynhttpcontext Asyncontext = new Asynhttpcontext (m                Yhttpwebrequest); string trankey = Transactionmanager<asynhttpcontext>.                Instance.register (Asyncontext); Aysnchttprequesthelperv2.post (Asyncontext, data, New Action<asynhttpcontext, exception> (HttpContext, ex) = > {try {//Transactionmanager<as Ynhttpcontext>.                        Instance.unregister (Trankey); if (ex! = null) {//_tracing.                            Error (ex, "Exception occurs on AysncHttpRequestHelperV2 Post Request.");              Onresponseget (null, ex);          } else {string rspstr = Encoding.UTF8.                            GetString (httpcontext.responsebytes);                            _tracing.infofmt ("Aysnc Get Response Content: {0}", RSPSTR);                        Onresponseget (RSPSTR, NULL); }} catch (Exception ex2) {//_TRACING.E                        RRORFMT (Ex2, "");                    Onresponseget (null, EX2);            }                })); } catch (Exception ex) {//_tracing.                Error (ex, "Exception occurs on AYSNC Post Request.");            Onresponseget (null, ex); }

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