equest重写，解决资源战胜/链接超时/分块下载事件通知 问题。
HttPRequest重写，解决资源战胜/链接超时/分块下载事件通知 问题。/************************************************************************************** 文 件 名：WebRequest.cs* 创建时间：2015-06-18* 作 者：Sam Shum (s.sams＠msn.com)* 说 明：解决WebHttpRequest下载网页数据出现问题 * 修改时间：2015-06-19* 修 改 人：Sam Shum*************************************************************************************/using System;using System.Collections.Generic;using System.ComponentModel;using System.IO;using System.IO.Compression;using System.Linq;using System.Net;using System.Text;using System.Web;namespace S.Sams.Common{ public class HttpRequest { public HttpRequest() { //string Url = "http://localhost:5192/api/Cab/5"; //string httpMethod = "PUT"; //string httpContent = "{'Name': 'B90', 'Color': 'Green', 'Height': 1590, 'Width': 4500 }"; //Encoding httpCode = Encoding.Default; //Console.WriteLine(Get(Url, httpMethod, httpContent, httpCode)); setEncoding = Encoding.Default; } public HttpRequest(string url, string method) : base() { setUrl = url; setMethod = method; } /// <summary> /// 服务请求地址 http://www.aaa.com/ /// </summary> public string setUrl { get; set; } /// <summary> /// 服务请求方法：GET/POST/PUT/DELETE /// </summary> public string setMethod { get; set; } /// <summary> /// 设置服务请求数据类型 /// </summary> [DefaultValue("text/html")] public string setContentType { get; set; } /// <summary> /// 设置服务页面编码 /// </summary> public Encoding setEncoding { get; set; } public delegate void DownloadStartDelegate(int httpStatusCode); public delegate void DownloadProcessDelegate(long totalLength, long DownloadedByte, float percent); public delegate void DownloadEndDelegate(long totalLength); public event DownloadStartDelegate DownloadStart; public event DownloadProcessDelegate DownloadProcess; public event DownloadEndDelegate DownloadEnd; public string Get() { return Get(setUrl); } public string Get(string setUrl) { return Get(setUrl, "GET", null, setEncoding); } public string Get(string setUrl, string httpContent) { return Get(setUrl, "POSE", httpContent, setEncoding); } public string Get(string Url, string httpMethod, string httpContent, Encoding httpCode) { if (string.IsNullOrWhiteSpace(Url) || string.IsNullOrWhiteSpace(httpMethod)) { throw new ArgumentException("Url or HttpMethod 参数不能为空！"); } GC.Collect(); StringBuilder content = new StringBuilder(); HttpWebRequest request = null; HttpWebResponse response = null; StreamWriter sw = null; try { ServicePointManager.DefaultConnectionLimit = 512; request = WebRequest.Create(Url) as HttpWebRequest; request.Method = httpMethod; request.AllowAutoRedirect = true; request.KeepAlive = false; request.Accept = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; Maxthon 2.0)"; request.ContentType = setContentType; //"application/octet-stream"; request.Proxy = null; if (httpContent != null && !string.IsNullOrWhiteSpace(httpContent)) { using (sw = new StreamWriter(request.GetRequestStream())) { sw.Write(httpContent); } } using (response = request.GetResponse() as HttpWebResponse) { if (this.DownloadStart != null) this.DownloadStart((int)response.StatusCode); Stream stream = response.GetResponseStream(); if (response.ContentEncoding.ToLower().Contains("gzip")) stream = new GZipStream(stream, CompressionMode.Decompress); float percent = 0; long totalDownloadedByte = 0; long totalBytes = response.ContentLength; while (stream.CanRead) { byte[] buffer = new byte[1024]; int canrds = stream.Read(buffer, 0, 1024); totalDownloadedByte = canrds + totalDownloadedByte; percent = (float)totalDownloadedByte / (float)totalBytes * 100; if (DownloadProcess != null) DownloadProcess(totalBytes, totalDownloadedByte, percent); if (canrds == 0) break; content.Append(httpCode.GetString(buffer)); } if (DownloadEnd != null) DownloadEnd(totalBytes); stream.Dispose(); } } finally { if(request != null) request.Abort(); if(response != null) response.Dispose(); if(sw != null) sw.Dispose(); } GC.SuppressFinalize(this); return content.ToString(); /* Response.Write(Guid.NewGuid().ToString() + "<hr />"); Response.Write(Guid.NewGuid().ToString("N") + "<hr />"); Response.Write(GetHttpContent); Response.End(); */ } }}
