C# 非同步發送HTTP請求的範例程式碼詳細介紹

Http非同步請求

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(AysncHttpRequestHelperV2));        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)            : this(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> callBack)        {            AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(request, callBack);            proxy.SendRequest(reqBytes);        }        public static void Post(AsynHttpContext context, byte[] reqBytes, Action<AsynHttpContext, Exception> callBack)        {            AysncHttpRequestHelperV2 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>        /// 用於http get        /// </summary>        /// <param name="req">HttpWebRequest</param>        /// <param name="action"></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>        /// 用於POST        /// </summary>        /// <param name="req">HttpWebRequest</param>        /// <param name="reqBytes">post bytes</param>        /// <param name="action">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 : IDisposable    {        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 (disposing)                {                    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>        /// 位移量        /// </summary>        public int Offset        {            get { return _offset; }            set { _offset = value; }        }        int _count;        /// <summary>        /// 讀取次數        /// </summary>        public int Count        {            get { return _count; }            set { _count = value; }        }        int _unreadLength;        /// <summary>        /// 沒有讀取的長度        /// </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; }        }    }}

調用：

  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 > 0)                //{                //    foreach (var eachheader in headers)                //    {                //        myHttpWebRequest.Headers.Add(eachheader.Key, eachheader.Value);                //    }                //}                                             AsynHttpContext asynContext = new AsynHttpContext(myHttpWebRequest);                // string tranKey = TransactionManager<AsynHttpContext>.Instance.Register(asynContext);                AysncHttpRequestHelperV2.Post(asynContext, data, new Action<AsynHttpContext, Exception>((httpContext, ex) =>                {                    try                    {                        //       TransactionManager<AsynHttpContext>.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.ErrorFmt(ex2, "");                        OnResponseGet(null, ex2);                    }                }));            }            catch (Exception ex)            {                // _tracing.Error(ex, "Exception Occurs On Aysnc Post Request.");                OnResponseGet(null, ex);            }

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