在WinForm中通过HTTP协议向服务器端上传文件(转）
相信用ASP.NET寫一個上傳文件的網頁，大家都會寫，但是有沒有人想過通過在WinForm中通過HTTP協議上傳文件呢？
有些人說要向服務器端上傳文件，用FTP協議不是很簡單嗎？效率又高，為什么還要使用HTTP協議那么麻煩呢？這里面有幾個原因：
（1）FTP服務器的部署相對麻煩，還要設置權限，權限設置不對，還會惹來一系列的安全問題。
（2）如果雙方都還有防火墻，又不想開發FTP相關的一些端口時，HTTP就會大派用場，就像WEB Services能穿透防火墻一樣。
（3）其他的...，還在想呢...
但是使用HTTP也有他的一些問題，例如不能斷點續傳，大文件上傳很難，速度很慢，所以HTTP協議上傳的文件大小不應該太大。
說了這么多，原歸正傳，一般來說，在Winform里通過HTTP上傳文件有幾種可選的方法：
（1）前面提到的Web Services，就是一種很好的方法，通過編寫一個WebMethod，包含有 byte[] 類型的參數，然后調用Web Services的方法，文件內容就會以Base64編碼傳到服務器上，然后重新保存即可。
[WebMethod]
public void UploadFile(byte[] content,string filename)...{
?????????? Stream sw = new StreamWriter(...);
?????????? sw.Close();
}
當然，這種通過Base64編碼的方法效率比較低，那么可以采用WSE，支持附件，并以2進制形式傳送，效率會更高。
（2）除了通過WebService，另外一種更簡單的方法就是通過WebClient或者HttpWebRequest來模擬HTTP的POST動作來實現。這時候首先需要編寫一個asp.net web form來響應上傳，代碼如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
?<head>
? <title>WebForm1</title>
? <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
? <meta name="CODE_LANGUAGE" Content="C#">
? <meta name="vs_defaultClientScript" content="JavaScript">
? <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
?</head>
?<body>
? <form id="Form1" method="post" runat="server">
? </form>
?</body>
</html>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace UploadFileWeb
...{
?/** <summary>
?/// WebForm1 的摘要說明。
?/// </summary>
?public class WebForm1 : System.Web.UI.Page
?...{
? private void Page_Load(object sender, System.EventArgs e)
? ...{
?? // 在此處放置用戶代碼以初始化頁面
?? foreach( string f in Request.Files.AllKeys)
?? ...{
??? HttpPostedFile file = Request.Files[f];
??? file.SaveAs(@"D:\Temp\" + file.FileName);
?? }
?? if( Request.Params["testKey"] != null )
?? ...{
??? Response.Write(Request.Params["testKey"]);
?? }
? }
? Web 窗體設計器生成的代碼#region Web 窗體設計器生成的代碼
? override protected void OnInit(EventArgs e)
? ...{
?? //
?? // CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
?? //
?? InitializeComponent();
?? base.OnInit(e);
? }
?
? /** <summary>
? /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
? /// 此方法的內容。
? /// </summary>
? private void InitializeComponent()
? ...{???
?? this.Load += new System.EventHandler(this.Page_Load);
? }
? #endregion
?}
}
其實這個頁面跟我們平常寫的asp.net上傳文件代碼是一樣的，在Web 頁的Request對象中包含有Files這個對象，里面就包含了通過POST方式上傳的所有文件的信息，這時所需要做的就是調用 Request.Files[i].SaveAs方法。
但是怎么讓才能在WinForm里面模擬想Web Form POST 數據呢？System.Net命名空間里面提供了兩個非常有用的類，一個是WebClient，另外一個是HttpWebRequest類。如果我們不需要通過代理服務器來上傳文件，那么非常簡單，只需要簡單的調用WebClient.UploadFile方法就能實現上傳文件：
private void button1_Click(object sender, System.EventArgs e)
? ...{
?? WebClient myWebClient = new WebClient();
??
?? myWebClient.UploadFile("http://localhost/UploadFileWeb/WebForm1.aspx%22,%22POST%22,@%22D:/Temp/Java/JavaStart/JavaStart2.exe");
?????? }
是不是覺得很簡單呢？確實就這么簡單。
但是如果要通過代理服務器上傳又怎么辦呢？那就需要使用到HttpWebRequest，但是該類沒有Upload方法，但是幸運的是我們通過Reflector反編譯了WebClient.UploadFile方法后，我們發現其內部也是通過WebRequest來實現的，代碼如下：
public byte[] UploadFile(string address, string method, string fileName)
...{
????? string text1;
????? string text2;
????? WebRequest request1;
????? string text3;
????? byte[] buffer1;
????? byte[] buffer2;
????? long num1;
????? byte[] buffer3;
????? int num2;
????? WebResponse response1;
????? byte[] buffer4;
????? DateTime time1;
????? long num3;
????? string[] textArray1;
????? FileStream stream1 = null;
????? try
????? ...{
??????????? fileName = Path.GetFullPath(fileName);
??????????? time1 = DateTime.Now;
??????????? num3 = time1.Ticks;
??????????? text1 = "---------------------" + num3.ToString("x");
??????????? if (this.m_headers == null)
??????????? ...{
????????????????? this.m_headers = new WebHeaderCollection();
??????????? }
??????????? text2 = this.m_headers["Content-Type"];
??????????? if (text2 != null)
??????????? ...{
????????????????? if (text2.ToLower(CultureInfo.InvariantCulture).StartsWith("multipart/"))
????????????????? ...{
??????????????????????? throw new WebException(SR.GetString("net_webclient_Multipart"));
????????????????? }
??????????? }
??????????? else
??????????? ...{
????????????????? text2 = "application/octet-stream";
??????????? }
??????????? this.m_headers["Content-Type"] = "multipart/form-data; boundary=" + text1;
??????????? this.m_responseHeaders = null;
??????????? stream1 = new FileStream(fileName, FileMode.Open, FileAccess.Read);
??????????? request1 = WebRequest.Create(this.GetUri(address));
??????????? request1.Credentials = this.Credentials;
??????????? this.CopyHeadersTo(request1);
??????????? request1.Method = method;
??????????? textArray1 = new string[7];
??????????? textArray1[0] = "--";
??????????? textArray1[1] = text1;
??????????? textArray1[2] = "\r\nContent-Disposition: form-data; name=\"file\"; filename=\"";
??????????? textArray1[3] = Path.GetFileName(fileName);
??????????? textArray1[4] = "\"\r\nContent-Type: ";
??????????? textArray1[5] = text2;
??????????? textArray1[6] = "\r\n\r\n";
??????????? text3 = string.Concat(textArray1);
??????????? buffer1 = Encoding.UTF8.GetBytes(text3);
??????????? buffer2 = Encoding.ASCII.GetBytes("\r\n--" + text1 + "\r\n");
??????????? num1 = 9223372036854775807;
??????????? try
??????????? ...{
????????????????? num1 = stream1.Length;
????????????????? request1.ContentLength = ((num1 + ((long) buffer1.Length)) + ((long) buffer2.Length));
??????????? }
??????????? catch
??????????? ...{
??????????? }
??????????? buffer3 = new byte[Math.Min(((int) 8192), ((int) num1))];
??????????? using (Stream stream2 = request1.GetRequestStream())
??????????? ...{
????????????????? stream2.Write(buffer1, 0, buffer1.Length);
????????????????? do
????????????????? ...{
??????????????????????? num2 = stream1.Read(buffer3, 0, buffer3.Length);
??????????????????????? if (num2 != 0)
??????????????????????? ...{
????????????????????????????? stream2.Write(buffer3, 0, num2);
??????????????????????? }
????????????????? }
????????????????? while ((num2 != 0));
????????????????? stream2.Write(buffer2, 0, buffer2.Length);
??????????? }
??????????? stream1.Close();
??????????? stream1 = null;
??????????? response1 = request1.GetResponse();
??????????? this.m_responseHeaders = response1.Headers;
??????????? return this.ResponseAsBytes(response1);
????? }
????? catch (Exception exception1)
????? ...{
??????????? if (stream1 != null)
??????????? ...{
????????????????? stream1.Close();
????????????????? stream1 = null;
??????????? }
??????????? if ((exception1 is WebException) || (exception1 is SecurityException))
??????????? ...{
????????????????? throw;
??????????? }
??????????? throw new WebException(SR.GetString("net_webclient"), exception1);
????? }
????? return buffer4;
}
?
在這段代碼里面其實最關鍵的就是如何模擬POST請求，通過分析代碼和監視HTTP，我們可以發現模擬的POST格式如下：
-----------------------8c64f47716481f0? //時間戳
Content-Disposition: form-data; name="file"; filename="a.txt"? //文件名
Content-Type: application/octet-stream
?
//文件的內容
-----------------------8c64f47716481f0
這時候，我們只需自己編碼來模擬這么一組數據就行（我們還可以好好借鑒MS的代碼呢），以下就是代碼（聲明一下，我是借用了別人的代碼）
public class wwHttp
?...{
? /** <summary>
? /// Fires progress events when using GetUrlEvents() to retrieve a URL.
? /// </summary>
? public event OnReceiveDataHandler OnReceiveData;
? /** <summary>
? /// Determines how data is POSTed when cPostBuffer is set.
? /// 1 - UrlEncoded
? /// 2 - Multi-Part form vars
? /// 4 - XML (raw buffer content type: text/xml)
? /// </summary>
? public int PostMode
? ...{
?? get ...{ return this.nPostMode; }
?? set ...{ this.nPostMode = value; }
? }
? /** <summary>
? ///? User name used for Authentication.
? ///? To use the currently logged in user when accessing an NTLM resource you can use "AUTOLOGIN".
? /// </summary>
? public string Username
? ...{
?? get ...{ return this.cUsername; }
?? set ...{ cUsername = value; }
? }
? /** <summary>
? /// Password for Authentication.
? /// </summary>
? public string Password
? ...{
?? get ...{return this.cPassword;}
?? set ...{this.cPassword = value;}
? }
? /** <summary>
? /// Address of the Proxy Server to be used.
? /// Use optional DEFAULTPROXY value to specify that you want to IE's Proxy Settings
? /// </summary>
? public string ProxyAddress?
? ...{
?? get ...{return this.cProxyAddress;}
?? set ...{this.cProxyAddress = value;}
? }
? /** <summary>
? /// Semicolon separated Address list of the servers the proxy is not used for.
? /// </summary>
? public string ProxyBypass
? ...{
?? get ...{return this.cProxyBypass;}
?? set ...{this.cProxyBypass = value;}
? }
? /** <summary>
? /// Username for a password validating Proxy. Only used if the proxy info is set.
? /// </summary>
? public string ProxyUsername
? ...{
?? get ...{return this.cProxyUsername;}
?? set ...{this.cProxyUsername = value;}
? }
? /** <summary>
? /// Password for a password validating Proxy. Only used if the proxy info is set.
? /// </summary>
? public string ProxyPassword
? ...{
?? get ...{return this.cProxyPassword;}
?? set ...{this.cProxyPassword = value;}
? }
? /** <summary>
? /// Timeout for the Web request in seconds. Times out on connection, read and send operations.
? /// Default is 30 seconds.
? /// </summary>
? public int Timeout
? ...{
?? get ...{return this.nConnectTimeout; }
?? set ...{this.nConnectTimeout = value; }
? }
? /** <summary>
? /// Error Message if the Error Flag is set or an error value is returned from a method.
? /// </summary>
? public string ErrorMsg
? ...{
?? get ...{ return this.cErrorMsg; }
?? set ...{ this.cErrorMsg = value; }
? }
?
? /** <summary>
? /// Error flag if an error occurred.
? /// </summary>
? public bool Error
? ...{
?? get ...{ return this.bError; }
?? set ...{ this.bError = value; }
? }
? /** <summary>
? /// Determines whether errors cause exceptions to be thrown. By default errors
? /// are handled in the class and the Error property is set for error conditions.
? /// (not implemented at this time).
? /// </summary>
? public bool ThrowExceptions
? ...{
?? get ...{ return bThrowExceptions; }
?? set ...{ this.bThrowExceptions = value;}
? }
? /** <summary>
? /// If set to a non-zero value will automatically track cookies. The number assigned is the cookie count.
? /// </summary>
? public bool HandleCookies
? ...{
?? get ...{ return this.bHandleCookies; }
?? set ...{ this.bHandleCookies = value; }
? }
? public CookieCollection Cookies ...{
?? get ...{ return this.oCookies; }
?? set ...{ this.Cookies = value; }
? }
? public HttpWebResponse WebResponse? ...{
?? get ...{ return this.oWebResponse;}
?? set ...{ this.oWebResponse = value; }
? }
? public HttpWebRequest WebRequest? ...{
?? get ...{ return this.oWebRequest; }
?? set ...{ this.oWebRequest = value; }
? }
? // *** member properties
? //string cPostBuffer = "";
? MemoryStream oPostStream;
? BinaryWriter oPostData;
? int nPostMode = 1;
? int nConnectTimeout = 30;
? string cUserAgent = "West Wind HTTP .NET";
? string cUsername = "";
? string cPassword = "";
? string cProxyAddress = "";
? string cProxyBypass = "";
? string cProxyUsername = "";
? string cProxyPassword = "";
? bool bThrowExceptions = false;
? bool bHandleCookies = false;
?
? string cErrorMsg = "";
? bool bError = false;
?
? HttpWebResponse oWebResponse;
? HttpWebRequest oWebRequest;
? CookieCollection oCookies;
? string cMultiPartBoundary = "-----------------------------7cf2a327f01ae";
? public void wwHTTP()
? ...{
?? //
?? // TODO: Add constructor logic here
?? //
? }
? /** <summary>
? /// Adds POST form variables to the request buffer.
? /// HttpPostMode determines how parms are handled.
? /// 1 - UrlEncoded Form Variables. Uses key and value pairs (ie. "Name","Rick") to create URLEncoded content
? /// 2 - Multi-Part Forms - not supported
? /// 4 - XML block - Post a single XML block. Pass in as Key (1st Parm)
? /// other - raw content buffer. Just assign to Key.
? /// </summary>
? /// <param name="Key">Key value or raw buffer depending on post type</param>
? /// <param name="Value">Value to store. Used only in key/value pair modes</param>
? public void AddPostKey(string Key, byte[] Value)
? ...{
??
?? if (this.oPostData == null)
?? ...{
??? this.oPostStream = new MemoryStream();
??? this.oPostData = new BinaryWriter(this.oPostStream);
?? }
??
?? if (Key == "RESET")
?? ...{
??? this.oPostStream = new MemoryStream();
??? this.oPostData = new BinaryWriter(this.oPostStream);
?? }
?? switch(this.nPostMode)
?? ...{
??? case 1:
???? this.oPostData.Write(Encoding.GetEncoding(1252).GetBytes(
????????? Key + "=" + System.Web.HttpUtility.UrlEncode(Value) + "&"));
???? break;
??? case 2:
???? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes(
????? "--" + this.cMultiPartBoundary + "\r\n" +
????? "Content-Disposition: form-data; name=\"" +Key+"\"\r\n\r\n") );
????
???? this.oPostData.Write( Value );
???? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes("\r\n") );
???? break;
??? default:
???? this.oPostData.Write( Value );
???? break;
?? }
? }
? public void AddPostKey(string Key, string Value)
? ...{
?? this.AddPostKey(Key,Encoding.GetEncoding(1252).GetBytes(Value));
? }
? /** <summary>
? /// Adds a fully self contained POST buffer to the request.
? /// Works for XML or previously encoded content.
? /// </summary>
? /// <param name="PostBuffer"></param>
? public void AddPostKey(string FullPostBuffer)
? ...{
?? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes(FullPostBuffer) );
? }
? public bool AddPostFile(string Key,string FileName)
? ...{
?? byte[] lcFile;
?? if (this.nPostMode != 2) ...{
??? this.cErrorMsg = "File upload allowed only with Multi-part forms";
??? this.bError = true;
??? return false;
?? }
?? try
?? ...{??
??? FileStream loFile = new FileStream(FileName,System.IO.FileMode.Open,System.IO.FileAccess.Read);
??? lcFile = new byte[loFile.Length];
??? loFile.Read(lcFile,0,(int) loFile.Length);
??? loFile.Close();
?? }
?? catch(Exception e)
?? ...{
??? this.cErrorMsg = e.Message;
??? this.bError = true;
??? return false;
?? }
?? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes(
???? "--" + this.cMultiPartBoundary + "\r\n"? +
???? "Content-Disposition: form-data; name=\"" + Key + "\" filename=\"" +
???? new FileInfo(FileName).Name + "\"\r\n\r\n") );
?? this.oPostData.Write( lcFile );
?? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes("\r\n")) ;
?? return true;
? }
? /** <summary>
? /// Return a the result from an HTTP Url into a StreamReader.
? /// Client code should call Close() on the returned object when done reading.
? /// </summary>
? /// <param name="Url">Url to retrieve.</param>
? /// <param name="WebRequest">An HttpWebRequest object that can be passed in with properties preset.</param>
? /// <returns></returns>
? protected StreamReader GetUrlStream(string Url,HttpWebRequest Request)
? ...{
?? try
?? ...{
??? this.bError = false;
??? this.cErrorMsg = "";
??? if (Request == null)
??? ...{
???? Request =? (HttpWebRequest) System.Net.WebRequest.Create(Url);
??? }
???
??? Request.UserAgent = this.cUserAgent;
??? Request.Timeout = this.nConnectTimeout * 1000;
??? // *** Save for external access
??? this.oWebRequest = Request;
??? // *** Handle Security for the request
??? if (this.cUsername.Length > 0)
??? ...{
???? if (this.cUsername=="AUTOLOGIN")
????? Request.Credentials = CredentialCache.DefaultCredentials;
???? else
????? Request.Credentials = new NetworkCredential(this.cUsername,this.cPassword);
??? }
??
??? // *** Handle Proxy Server configuration
??? if (this.cProxyAddress.Length > 0)
??? ...{
???? if (this.cProxyAddress == "DEFAULTPROXY")
???? ...{
????? Request.Proxy = new WebProxy();
????? Request.Proxy = WebProxy.GetDefaultProxy();
???? }
???? else
???? ...{
????? WebProxy loProxy = new WebProxy(this.cProxyAddress,true);
????? if (this.cProxyBypass.Length > 0)
????? ...{
?????? loProxy.BypassList = this.cProxyBypass.Split(';');
????? }
????? if (this.cProxyUsername.Length > 0)
?????? loProxy.Credentials = new NetworkCredential(this.cProxyUsername,this.cProxyPassword);
????? Request.Proxy = loProxy;
???? }
??? }
???
??? // *** Handle cookies - automatically re-assign
??? if (this.bHandleCookies)
??? ...{
???? Request.CookieContainer = new CookieContainer();
???? if (this.oCookies != null && this.oCookies.Count > 0)
???? ...{
????? Request.CookieContainer.Add(this.oCookies);
???? }
??? }
??? // *** Deal with the POST buffer if any
??? if (this.oPostData != null)
??? ...{
???? Request.Method = "POST";
???? switch (this.nPostMode)
???? ...{
????? case 1:
?????? Request.ContentType = "application/x-www-form-urlencoded";
?????? // strip off any trailing & which can cause problems with some
?????? // http servers
//?????? if (this.cPostBuffer.EndsWith("&"))
//??????? this.cPostBuffer = this.cPostBuffer.Substring(0,this.cPostBuffer.Length-1);
?????? break;
????? case 2:
?????? Request.ContentType = "multipart/form-data; boundary=" + this.cMultiPartBoundary;
?????? this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes( "--" + this.cMultiPartBoundary + "\r\n" ) );
?????? break;
????? case 4:
?????? Request.ContentType = "text/xml";
?????? break;
????? default:
?????? goto case 1;
???? }
????
???? Stream loPostData = Request.GetRequestStream();
???? //loPostData.Write(lcPostData,0,lcPostData.Length);
???? this.oPostStream.WriteTo(loPostData);??
????
???? byte[] buffer = new byte[this.oPostStream.Length];
???? buffer = this.oPostStream.ToArray();
???? Console.Write(Encoding.GetEncoding(1252).GetString(buffer,0,buffer.Length));
???? //*** Close the memory stream
???? this.oPostStream.Close();
???? this.oPostStream = null;
????
???? //*** Close the Binary Writer
???? this.oPostData.Close();
???? this.oPostData = null;
???? //*** Close Request Stream
???? loPostData.Close();
???? // *** clear the POST buffer
???? //this.cPostBuffer = "";
??? }
?
?
??? // *** Retrieve the response headers
??? HttpWebResponse Response = (HttpWebResponse) Request.GetResponse();
??? // ** Save cookies the server sends
??? if (this.bHandleCookies)?
??? ...{
???? if (Response.Cookies.Count > 0)?
???? ...{
????? if (this.oCookies == null)?
????? ...{
?????? this.oCookies = Response.Cookies;
????? }
????? else
????? ...{
?????? // ** If we already have cookies update the list
?????? foreach (Cookie oRespCookie in Response.Cookies)?
?????? ...{
??????? bool bMatch = false;
??????? foreach(Cookie oReqCookie in this.oCookies)?
??????? ...{
???????? if (oReqCookie.Name == oRespCookie.Name)?
???????? ...{
????????? oReqCookie.Value = oRespCookie.Name;
????????? bMatch = true;
????????? break; //
???????? }
??????? } // for each ReqCookies
??????? if (!bMatch)
???????? this.oCookies.Add(oRespCookie);
?????? } // for each Response.Cookies
????? }? // this.Cookies == null
???? } // if Response.Cookie.Count > 0
??? }? // if this.bHandleCookies = 0
???
??? // *** Save the response object for external access
??? this.oWebResponse = Response;
??? Encoding enc;
??? try
??? ...{
???? if (Response.ContentEncoding.Length? > 0)
????? enc = Encoding.GetEncoding(Response.ContentEncoding);
???? else
????? enc = Encoding.GetEncoding(1252);
??? }
??? catch
??? ...{
???? // *** Invalid encoding passed
???? enc = Encoding.GetEncoding(1252);
??? }
???
??? // *** drag to a stream
??? StreamReader strResponse =
???? new StreamReader(Response.GetResponseStream(),enc);
??? return strResponse;
?? }
?? catch(Exception e)
?? ...{
??? if (this.bThrowExceptions)
???? throw e;
??? this.cErrorMsg = e.Message;
??? this.bError = true;
??? return null;
?? }
? }
? /** <summary>
? /// Return a the result from an HTTP Url into a StreamReader.
? /// Client code should call Close() on the returned object when done reading.
? /// </summary>
? /// <param name="Url">Url to retrieve.</param>
? /// <returns></returns>
? public StreamReader GetUrlStream(string Url)
? ...{
?? HttpWebRequest oHttpWebRequest = null;
?? return this.GetUrlStream(Url,oHttpWebRequest);
? }
? /** <summary>
? /// Return a the result from an HTTP Url into a StreamReader.
? /// Client code should call Close() on the returned object when done reading.
? /// </summary>
? /// <param name="Request">A Request object</param>
? /// <returns></returns>
? public StreamReader GetUrlStream(HttpWebRequest Request)
? ...{
?? return this.GetUrlStream(Request.RequestUri.AbsoluteUri,Request);
? }
?
? /** <summary>
? /// Return a the result from an HTTP Url into a string.
? /// </summary>
? /// <param name="Url">Url to retrieve.</param>
? /// <returns></returns>
? public string GetUrl(string Url)
? ...{
?? StreamReader oHttpResponse = this.GetUrlStream(Url);
?? if (oHttpResponse == null)
??? return "";
?? string lcResult = oHttpResponse.ReadToEnd();
?? oHttpResponse.Close();
?? return lcResult;
? }
? /** <summary>
? /// Return a the result from an HTTP Url into a string.
? /// </summary>
? /// <param name="Url">Url to retrieve.</param>
? /// <returns></returns>
? public byte[] GetUrlBytes(string Url)
? ...{
?? StreamReader oHttpResponse = this.GetUrlStream(Url);
??
?? if (oHttpResponse == null)
?? ...{
??? return null;
?? }
?? string lcResult = oHttpResponse.ReadToEnd();
?? oHttpResponse.Close();
?? return null;
? }
? /** <summary>
? /// Retrieves URL with events in the OnReceiveData event.
? /// </summary>
? /// <param name="Url"></param>
? /// <param name="BufferSize"></param>
? /// <returns></returns>
? public string GetUrlEvents(string Url,long BufferSize)
? ...{
?
?? StreamReader oHttpResponse = this.GetUrlStream(Url);
?? if (oHttpResponse == null)
??? return "";
?? long lnSize = BufferSize;
?? if (this.oWebResponse.ContentLength > 0)
??? lnSize = this.oWebResponse.ContentLength;
?? else
??? lnSize = 0;
?? Encoding enc = Encoding.GetEncoding(1252);
?? StringBuilder loWriter = new StringBuilder((int) lnSize);
?????
?? char[] lcTemp = new char[BufferSize];
?? OnReceiveDataEventArgs oArgs = new OnReceiveDataEventArgs();
?? oArgs.TotalBytes = lnSize;
?? lnSize = 1;
?? int lnCount = 0;
?? long lnTotalBytes = 0;
?? while (lnSize > 0)
?? ...{
??? lnSize = oHttpResponse.Read(lcTemp,0,(int) BufferSize);
??? if (lnSize > 0)
??? ...{
???? loWriter.Append( lcTemp,0,(int) lnSize );
???? lnCount++;
???? lnTotalBytes += lnSize;
???? // *** Raise an event if hooked up
???? if (this.OnReceiveData != null)
???? ...{
????? /** *** Update the event handler
????? oArgs.CurrentByteCount = lnTotalBytes;
????? oArgs.NumberOfReads = lnCount;
????? oArgs.CurrentChunk = lcTemp;
????? this.OnReceiveData(this,oArgs);
????? // *** Check for cancelled flag
????? if (oArgs.Cancel)
?????? goto CloseDown;
???? }
??? }
?? } // while
? CloseDown:
?? oHttpResponse.Close();
?? // *** Send Done notification
?? if (this.OnReceiveData != null && !oArgs.Cancel)
?? ...{
??? // *** Update the event handler
??? oArgs.Done = true;
??? this.OnReceiveData(this,oArgs);
?? }
//?? return lcHtml;
?? return loWriter.ToString();
? }
? public delegate void OnReceiveDataHandler(object sender, OnReceiveDataEventArgs e);
? public class OnReceiveDataEventArgs
? ...{
?? public long CurrentByteCount=0;
?? public long TotalBytes = 0;
?? public int NumberOfReads = 0;
?? public char[] CurrentChunk;
?? public bool Done = false;
?? public bool Cancel = false;
? }?
?}
在wwHttp這個類里面，不僅僅可以傳送文件AddPostFile方法，還可以傳送變量AddPostKey方法。
這樣，如果我們要通過代理服務器傳送文件，就可以編寫如下的代碼了：
wwHttp ww = new wwHttp();
?? ww.ProxyAddress = "202.132.156.124";??
?? ww.PostMode = 2;
?? ww.AddPostKey("testKey","test");
?? ww.AddPostFile("myfile",@"D:\Temp\Java\JavaStart\JavaStart2.jar");?
??
?? string shtml = ww.GetUrlEvents("http://localhost/UploadFileWeb/WebForm1.aspx%22,409600);
?? Console.Write(shtml);
小結：
（1）通過Web Services傳文件。
（2）如果不需要使用代理，使用WebClient類
（3）如果需要使用代理，使用擴展得到的類wwHttp
?轉載于:https://www.cnblogs.com/qingqiong/archive/2009/06/23/1509165.html
總結
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