C#、.NET网络请求总结（WebClient和WebRequest）
1、关于WebClient第三方的封装，支持多文件上传等
using System; using System.Collections.Generic; using System.Text; using System.Net; using System.Net.Sockets; using System.Collections; using System.IO; using System.Text.RegularExpressions; using RE = System.Text.RegularExpressions.Regex; using System.Security.Cryptography.X509Certificates; /*************************************************************************************************************************************************** * *文件名：HttpProc.cs * *创建人：kenter * *日 期：2010.02.23 修改 * *描 述：实现HTTP协议中的GET、POST请求 * *使 用：HttpProc.WebClient client = new HttpProc.WebClient(); client.Encoding = System.Text.Encoding.Default;//默认编码方式，根据需要设置其他类型 client.OpenRead("http://www.baidu.com");//普通get请求 MessageBox.Show(client.RespHtml);//获取返回的网页源代码 client.DownloadFile("http://www.codepub.com/upload/163album.rar",@"C:\163album.rar");//下载文件 client.OpenRead("http://passport.baidu.com/?login","username=zhangsan&password=123456");//提交表单，此处是登录百度的示例 client.UploadFile("http://hiup.baidu.com/zhangsan/upload", @"file1=D:\1.mp3");//上传文件 client.UploadFile("http://hiup.baidu.com/zhangsan/upload", "folder=myfolder&size=4003550",@"file1=D:\1.mp3");//提交含文本域和文件域的表单 *****************************************************************************************************************************************************/ namespace HttpProc { ///<summary> ///上传事件委托 ///</summary> ///<param name="sender"></param> ///<param name="e"></param> public delegate void WebClientUploadEvent(object sender, HttpProc.UploadEventArgs e); ///<summary> ///下载事件委托 ///</summary> ///<param name="sender"></param> ///<param name="e"></param> public delegate void WebClientDownloadEvent(object sender, HttpProc.DownloadEventArgs e); ///<summary> ///上传事件参数 ///</summary> public struct UploadEventArgs { ///<summary> ///上传数据总大小 ///</summary> public long totalBytes; ///<summary> ///已发数据大小 ///</summary> public long bytesSent; ///<summary> ///发送进度(0-1) ///</summary> public double sendProgress; ///<summary> ///发送速度Bytes/s ///</summary> public double sendSpeed; } ///<summary> ///下载事件参数 ///</summary> public struct DownloadEventArgs { ///<summary> ///下载数据总大小 ///</summary> public long totalBytes; ///<summary> ///已接收数据大小 ///</summary> public long bytesReceived; ///<summary> ///接收数据进度(0-1) ///</summary> public double ReceiveProgress; ///<summary> ///当前缓冲区数据 ///</summary> public byte[] receivedBuffer; ///<summary> ///接收速度Bytes/s ///</summary> public double receiveSpeed; } ///<summary> ///实现向WEB服务器发送和接收数据 ///</summary> public class WebClient { private WebHeaderCollection requestHeaders, responseHeaders; private TcpClient clientSocket; private MemoryStream postStream; private Encoding encoding = Encoding.Default; private const string BOUNDARY = "--HEDAODE--"; private const int SEND_BUFFER_SIZE = 10245; private const int RECEIVE_BUFFER_SIZE = 10245; private string cookie = ""; private string respHtml = ""; private string strRequestHeaders = ""; private string strResponseHeaders = ""; private int statusCode = 0; private bool isCanceled = false; public event WebClientUploadEvent UploadProgressChanged; public event WebClientDownloadEvent DownloadProgressChanged; ///<summary> ///初始化WebClient类 ///</summary> public WebClient() { responseHeaders = new WebHeaderCollection(); requestHeaders = new WebHeaderCollection(); } /// <summary> /// 获得字符串中开始和结束字符串中间得值 /// </summary> /// <param name="str"></param> /// <param name="s">开始</param> /// <param name="e">结束</param> /// <returns></returns> public string gethtmlContent(string str, string s, string e) { Regex rg = new Regex("(?<=(" + s + "))[.\\s\\S]*?(?=(" + e + "))", RegexOptions.Multiline | RegexOptions.Singleline); return rg.Match(str).Value; } /// <summary> /// 过滤HTML字符 /// </summary> /// <param name="source"></param> /// <returns></returns> public string htmlConvert(string source) { string result; //remove line breaks,tabs result = source.Replace("\r", " "); result = result.Replace("\n", " "); result = result.Replace("\t", " "); //remove the header result = Regex.Replace(result, "(<head>).*(</head>)", string.Empty, RegexOptions.IgnoreCase); result = Regex.Replace(result, @"<( )*script([^>])*>", "<script>", RegexOptions.IgnoreCase); result = Regex.Replace(result, @"(<script>).*(</script>)", string.Empty, RegexOptions.IgnoreCase); //remove all styles result = Regex.Replace(result, @"<( )*style([^>])*>", "<style>", RegexOptions.IgnoreCase); //clearing attributes result = Regex.Replace(result, "(<style>).*(</style>)", string.Empty, RegexOptions.IgnoreCase); //insert tabs in spaces of <td> tags result = Regex.Replace(result, @"<( )*td([^>])*>", " ", RegexOptions.IgnoreCase); //insert line breaks in places of <br> and <li> tags result = Regex.Replace(result, @"<( )*br( )*>", "\r", RegexOptions.IgnoreCase); result = Regex.Replace(result, @"<( )*li( )*>", "\r", RegexOptions.IgnoreCase); //insert line paragraphs in places of <tr> and <p> tags result = Regex.Replace(result, @"<( )*tr([^>])*>", "\r\r", RegexOptions.IgnoreCase); result = Regex.Replace(result, @"<( )*p([^>])*>", "\r\r", RegexOptions.IgnoreCase); //remove anything thats enclosed inside < > result = Regex.Replace(result, @"<[^>]*>", string.Empty, RegexOptions.IgnoreCase); //replace special characters: result = Regex.Replace(result, @"&", "&", RegexOptions.IgnoreCase); result = Regex.Replace(result, @" ", " ", RegexOptions.IgnoreCase); result = Regex.Replace(result, @"<", "<", RegexOptions.IgnoreCase); result = Regex.Replace(result, @">", ">", RegexOptions.IgnoreCase); result = Regex.Replace(result, @"&(.{2,6});", string.Empty, RegexOptions.IgnoreCase); //remove extra line breaks and tabs result = Regex.Replace(result, @" ( )+", " "); result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r"); result = Regex.Replace(result, @"(\r\r)+", "\r\n"); return result; } ///<summary> ///读取指定URL的文本 ///</summary> ///<param name="URL">请求的地址</param> ///<returns>服务器响应文本</returns> public string OpenRead(string URL) { requestHeaders.Add("Connection", "close"); SendRequestData(URL, "GET"); return GetHtml(); } //解决证书过期无法访问的问题 class CertPolicy : ICertificatePolicy { public bool CheckValidationResult(ServicePoint srvpt, X509Certificate cert, WebRequest req, int certprb) { return true; } } ///<summary> ///采用https协议访问网络 ///</summary> ///<param name="URL">url地址</param> ///<param name="strPostdata">发送的数据</param> ///<returns></returns> public string OpenReadWithHttps(string URL, string strPostdata) { ServicePointManager.CertificatePolicy = new CertPolicy(); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL); request.CookieContainer = new CookieContainer(); request.Method = "POST"; request.Accept = "*/*"; request.ContentType = "application/x-www-form-urlencoded"; byte[] buffer = this.encoding.GetBytes(strPostdata); request.ContentLength = buffer.Length; request.GetRequestStream().Write(buffer, 0, buffer.Length); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream(), encoding); this.respHtml = reader.ReadToEnd(); foreach (System.Net.Cookie ck in response.Cookies) { this.cookie += ck.Name + "=" + ck.Value + ";"; } reader.Close(); return respHtml; } ///<summary> ///读取指定URL的文本 ///</summary> ///<param name="URL">请求的地址</param> ///<param name="postData">向服务器发送的文本数据</param> ///<returns>服务器响应文本</returns> public string OpenRead(string URL, string postData) { byte[] sendBytes = encoding.GetBytes(postData); postStream = new MemoryStream(); postStream.Write(sendBytes, 0, sendBytes.Length); requestHeaders.Add("Content-Length", postStream.Length.ToString()); requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded"); requestHeaders.Add("Connection", "close"); SendRequestData(URL, "POST"); return GetHtml(); } ///<summary> ///读取指定URL的流 ///</summary> ///<param name="URL">请求的地址</param> ///<param name="postData">向服务器发送的数据</param> ///<returns>服务器响应流</returns> public Stream GetStream(string URL, string postData) { byte[] sendBytes = encoding.GetBytes(postData); postStream = new MemoryStream(); postStream.Write(sendBytes, 0, sendBytes.Length); requestHeaders.Add("Content-Length", postStream.Length.ToString()); requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded"); requestHeaders.Add("Connection", "close"); SendRequestData(URL, "POST"); MemoryStream ms = new MemoryStream(); SaveNetworkStream(ms); return ms; } ///<summary> ///上传文件到服务器 ///</summary> ///<param name="URL">请求的地址</param> ///<param name="fileField">文件域(格式如:file1=C:\test.mp3&file2=C:\test.jpg)</param> ///<returns>服务器响应文本</returns> public string UploadFile(string URL, string fileField) { return UploadFile(URL, "", fileField); } ///<summary> ///上传文件和数据到服务器 ///</summary> ///<param name="URL">请求地址</param> ///<param name="textField">文本域(格式为:name1=value1&name2=value2)</param> ///<param name="fileField">文件域(格式如:file1=C:\test.mp3&file2=C:\test.jpg)</param> ///<returns>服务器响应文本</returns> public string UploadFile(string URL, string textField, string fileField) { postStream = new MemoryStream(); if (textField != "" && fileField != "") { WriteTextField(textField); WriteFileField(fileField); } else if (fileField != "") { WriteFileField(fileField); } else if (textField != "") { WriteTextField(textField); } else throw new Exception("文本域和文件域不能同时为空。"); //写入结束标记 byte[] buffer = encoding.GetBytes("--" + BOUNDARY + "--\r\n"); postStream.Write(buffer, 0, buffer.Length); //添加请求标头 requestHeaders.Add("Content-Length", postStream.Length.ToString()); requestHeaders.Add("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); requestHeaders.Add("Connection", "Keep-Alive"); //发送请求数据 SendRequestData(URL, "POST", true); //返回响应文本 return GetHtml(); } ///<summary> ///分析文本域，添加到请求流 ///</summary> ///<param name="textField">文本域</param> private void WriteTextField(string textField) { string[] strArr = RE.Split(textField, "&"); textField = ""; foreach (string var in strArr) { Match M = RE.Match(var, "([^=]+)=(.+)"); textField += "--" + BOUNDARY + "\r\n"; textField += "Content-Disposition: form-data; name=\"" + M.Groups[1].Value + "\"\r\n\r\n" + M.Groups[2].Value + "\r\n"; } byte[] buffer = encoding.GetBytes(textField); postStream.Write(buffer, 0, buffer.Length); } ///<summary> ///分析文件域，添加到请求流 ///</summary> ///<param name="fileField">文件域</param> private void WriteFileField(string fileField) { string filePath = ""; int count = 0; string[] strArr = RE.Split(fileField, "&"); foreach (string var in strArr) { Match M = RE.Match(var, "([^=]+)=(.+)"); filePath = M.Groups[2].Value; fileField = "--" + BOUNDARY + "\r\n"; fileField += "Content-Disposition: form-data; name=\"" + M.Groups[1].Value + "\"; filename=\"" + Path.GetFileName(filePath) + "\"\r\n"; fileField += "Content-Type: image/jpeg\r\n\r\n"; byte[] buffer = encoding.GetBytes(fileField); postStream.Write(buffer, 0, buffer.Length); //添加文件数据 FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); buffer = new byte[50000]; do { count = fs.Read(buffer, 0, buffer.Length); postStream.Write(buffer, 0, count); } while (count > 0); fs.Close(); fs.Dispose(); fs = null; buffer = encoding.GetBytes("\r\n"); postStream.Write(buffer, 0, buffer.Length); } } ///<summary> ///从指定URL下载数据流 ///</summary> ///<param name="URL">请求地址</param> ///<returns>数据流</returns> public Stream DownloadData(string URL) { requestHeaders.Add("Connection", "close"); SendRequestData(URL, "GET"); MemoryStream ms = new MemoryStream(); SaveNetworkStream(ms, true); return ms; } ///<summary> ///从指定URL下载文件 ///</summary> ///<param name="URL">文件URL地址</param> ///<param name="fileName">文件保存路径,含文件名(如:C:\test.jpg)</param> public void DownloadFile(string URL, string fileName) { requestHeaders.Add("Connection", "close"); SendRequestData(URL, "GET"); FileStream fs = new FileStream(fileName, FileMode.Create); SaveNetworkStream(fs, true); fs.Close(); fs = null; } ///<summary> ///向服务器发送请求 ///</summary> ///<param name="URL">请求地址</param> ///<param name="method">POST或GET</param> ///<param name="showProgress">是否显示上传进度</param> private void SendRequestData(string URL, string method, bool showProgress) { clientSocket = new TcpClient(); Uri URI = new Uri(URL); clientSocket.Connect(URI.Host, URI.Port); requestHeaders.Add("Host", URI.Host); byte[] request = GetRequestHeaders(method + " " + URI.PathAndQuery + " HTTP/1.1"); clientSocket.Client.Send(request); //若有实体内容就发送它 if (postStream != null) { byte[] buffer = new byte[SEND_BUFFER_SIZE]; int count = 0; Stream sm = clientSocket.GetStream(); postStream.Position = 0; UploadEventArgs e = new UploadEventArgs(); e.totalBytes = postStream.Length; System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();//计时器 timer.Start(); do { //如果取消就推出 if (isCanceled) { break; } //读取要发送的数据 count = postStream.Read(buffer, 0, buffer.Length); //发送到服务器 sm.Write(buffer, 0, count); //是否显示进度 if (showProgress) { //触发事件 e.bytesSent += count; e.sendProgress = (double)e.bytesSent / (double)e.totalBytes; double t = timer.ElapsedMilliseconds / 1000; t = t <= 0 ? 1 : t; e.sendSpeed = (double)e.bytesSent / t; if (UploadProgressChanged != null) { UploadProgressChanged(this, e); } } } while (count > 0); timer.Stop(); postStream.Close(); //postStream.Dispose(); postStream = null; }//end if } ///<summary> ///向服务器发送请求 ///</summary> ///<param name="URL">请求URL地址</param> ///<param name="method">POST或GET</param> private void SendRequestData(string URL, string method) { SendRequestData(URL, method, false); } ///<summary> ///获取请求头字节数组 ///</summary> ///<param name="request">POST或GET请求</param> ///<returns>请求头字节数组</returns> private byte[] GetRequestHeaders(string request) { requestHeaders.Add("Accept", "*/*"); requestHeaders.Add("Accept-Language", "zh-cn"); requestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"); string headers = request + "\r\n"; foreach (string key in requestHeaders) { headers += key + ":" + requestHeaders[key] + "\r\n"; } //有Cookie就带上Cookie if (cookie != "") { headers += "Cookie:" + cookie + "\r\n"; } //空行，请求头结束 headers += "\r\n"; strRequestHeaders = headers; requestHeaders.Clear(); return encoding.GetBytes(headers); } ///<summary> ///获取服务器响应文本 ///</summary> ///<returns>服务器响应文本</returns> private string GetHtml() { MemoryStream ms = new MemoryStream(); SaveNetworkStream(ms);//将网络流保存到内存流 StreamReader sr = new StreamReader(ms, encoding); respHtml = sr.ReadToEnd(); sr.Close(); ms.Close(); return respHtml; } ///<summary> ///将网络流保存到指定流 ///</summary> ///<param name="toStream">保存位置</param> ///<param name="needProgress">是否显示进度</param> private void SaveNetworkStream(Stream toStream, bool showProgress) { //获取要保存的网络流 NetworkStream NetStream = clientSocket.GetStream(); byte[] buffer = new byte[RECEIVE_BUFFER_SIZE]; int count = 0, startIndex = 0; MemoryStream ms = new MemoryStream(); for (int i = 0; i < 3; i++) { count = NetStream.Read(buffer, 0, 500); ms.Write(buffer, 0, count); } if (ms.Length == 0) { NetStream.Close(); throw new Exception("远程服务器没有响应"); } buffer = ms.GetBuffer(); count = (int)ms.Length; GetResponseHeader(buffer, out startIndex);//分析响应，获取响应头和响应实体 count -= startIndex; toStream.Write(buffer, startIndex, count); DownloadEventArgs e = new DownloadEventArgs(); if (responseHeaders["Content-Length"] != null) { e.totalBytes = long.Parse(responseHeaders["Content-Length"]); } else { e.totalBytes = -1; } //启动计时器 System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch(); timer.Start(); do { //如果取消就推出 if (isCanceled) { break; } //显示下载进度 if (showProgress) { e.bytesReceived += count; e.ReceiveProgress = (double)e.bytesReceived / (double)e.totalBytes; byte[] tempBuffer = new byte[count]; Array.Copy(buffer, startIndex, tempBuffer, 0, count); e.receivedBuffer = tempBuffer; double t = (timer.ElapsedMilliseconds + 0.1) / 1000; e.receiveSpeed = (double)e.bytesReceived / t; startIndex = 0; if (DownloadProgressChanged != null) { DownloadProgressChanged(this, e); } } //读取网路数据到缓冲区 count = NetStream.Read(buffer, 0, buffer.Length); //将缓存区数据保存到指定流 toStream.Write(buffer, 0, count); } while (count > 0); timer.Stop();//关闭计时器 if (responseHeaders["Content-Length"] != null) { toStream.SetLength(long.Parse(responseHeaders["Content-Length"])); } //else //{ // toStream.SetLength(toStream.Length); // responseHeaders.Add("Content-Length", toStream.Length.ToString());//添加响应标头 //} toStream.Position = 0; //关闭网络流和网络连接 NetStream.Close(); clientSocket.Close(); } ///<summary> ///将网络流保存到指定流 ///</summary> ///<param name="toStream">保存位置</param> private void SaveNetworkStream(Stream toStream) { SaveNetworkStream(toStream, false); } ///<summary> ///分析响应流，去掉响应头 ///</summary> ///<param name="buffer"></param> private void GetResponseHeader(byte[] buffer, out int startIndex) { responseHeaders.Clear(); string html = encoding.GetString(buffer); StringReader sr = new StringReader(html); int start = html.IndexOf("\r\n\r\n") + 4;//找到空行位置 strResponseHeaders = html.Substring(0, start);//获取响应头文本 //获取响应状态码 // if (sr.Peek() > -1) { //读第一行字符串 string line = sr.ReadLine(); //分析此行字符串,获取服务器响应状态码 Match M = RE.Match(line, @"\d\d\d"); if (M.Success) { statusCode = int.Parse(M.Value); } } //获取响应头 // while (sr.Peek() > -1) { //读一行字符串 string line = sr.ReadLine(); //若非空行 if (line != "") { //分析此行字符串，获取响应标头 Match M = RE.Match(line, "([^:]+):(.+)"); if (M.Success) { try { //添加响应标头到集合 responseHeaders.Add(M.Groups[1].Value.Trim(), M.Groups[2].Value.Trim()); } catch { } //获取Cookie if (M.Groups[1].Value == "Set-Cookie") { M = RE.Match(M.Groups[2].Value, "[^=]+=[^;]+"); cookie += M.Value.Trim() + ";"; } } } //若是空行，代表响应头结束响应实体开始。（响应头和响应实体间用一空行隔开） else { //如果响应头中没有实体大小标头，尝试读响应实体第一行获取实体大小 if (responseHeaders["Content-Length"] == null && sr.Peek() > -1) { //读响应实体第一行 line = sr.ReadLine(); //分析此行看是否包含实体大小 Match M = RE.Match(line, "~[0-9a-fA-F]{1,15}"); if (M.Success) { //将16进制的实体大小字符串转换为10进制 int length = int.Parse(M.Value, System.Globalization.NumberStyles.AllowHexSpecifier); responseHeaders.Add("Content-Length", length.ToString());//添加响应标头 strResponseHeaders += M.Value + "\r\n"; } } break;//跳出循环 }//End If }//End While sr.Close(); //实体开始索引 startIndex = encoding.GetBytes(strResponseHeaders).Length; } ///<summary> ///取消上传或下载,要继续开始请调用Start方法 ///</summary> public void Cancel() { isCanceled = true; } ///<summary> ///启动上传或下载，要取消请调用Cancel方法 ///</summary> public void Start() { isCanceled = false; } //************************************************************* //以下为属性 //************************************************************* ///<summary> ///获取或设置请求头 ///</summary> public WebHeaderCollection RequestHeaders { set { requestHeaders = value; } get { return requestHeaders; } } ///<summary> ///获取响应头集合 ///</summary> public WebHeaderCollection ResponseHeaders { get { return responseHeaders; } } ///<summary> ///获取请求头文本 ///</summary> public string StrRequestHeaders { get { return strRequestHeaders; } } ///<summary> ///获取响应头文本 ///</summary> public string StrResponseHeaders { get { return strResponseHeaders; } } ///<summary> ///获取或设置Cookie ///</summary> public string Cookie { set { cookie = value; } get { return cookie; } } ///<summary> ///获取或设置编码方式(默认为系统默认编码方式) ///</summary> public Encoding Encoding { set { encoding = value; } get { return encoding; } } ///<summary> ///获取服务器响应文本 ///</summary> public string RespHtml { get { return respHtml; } } ///<summary> ///获取服务器响应状态码 ///</summary> public int StatusCode { get { return statusCode; } } } }
2、WebRequest实现多文件文件上载
封装类：
public class UploadFile { public UploadFile() { ContentType = "application/octet-stream"; } public string Name { get; set; } public string Filename { get; set; } public string ContentType { get; set; } public Stream Stream { get; set; } } class ClassTest { public byte[] UploadFiles(string address, IEnumerable<UploadFile> files, NameValueCollection values) { var request = WebRequest.Create(address); request.Method = "POST"; var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo); request.ContentType = "multipart/form-data; boundary=" + boundary; boundary = "--" + boundary; using (var requestStream = request.GetRequestStream()) { // Write the values foreach (string name in values.Keys) { var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine); requestStream.Write(buffer, 0, buffer.Length); buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}", name, Environment.NewLine)); requestStream.Write(buffer, 0, buffer.Length); buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine); requestStream.Write(buffer, 0, buffer.Length); } // Write the files foreach (var file in files) { var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine); requestStream.Write(buffer, 0, buffer.Length); buffer = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"{2}", file.Name, file.Filename, Environment.NewLine)); requestStream.Write(buffer, 0, buffer.Length); buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}", file.ContentType, Environment.NewLine)); requestStream.Write(buffer, 0, buffer.Length); file.Stream.CopyTo(requestStream); buffer = Encoding.ASCII.GetBytes(Environment.NewLine); requestStream.Write(buffer, 0, buffer.Length); } var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + "--"); requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length); } using (var response = request.GetResponse()) using (var responseStream = response.GetResponseStream()) using (var stream = new MemoryStream()) { responseStream.CopyTo(stream); return stream.ToArray(); } } }
使用：
using (var stream1 = File.Open("test.txt", FileMode.Open)) using (var stream2 = File.Open("test.xml", FileMode.Open)) using (var stream3 = File.Open("test.pdf", FileMode.Open)) { var files = new[] { new UploadFile { Name = "file", Filename = "test.txt", ContentType = "text/plain", Stream = stream1 }, new UploadFile { Name = "file", Filename = "test.xml", ContentType = "text/xml", Stream = stream2 }, new UploadFile { Name = "file", Filename = "test.pdf", ContentType = "application/pdf", Stream = stream3 } }; var values = new NameValueCollection { { "key1", "value1" }, { "key2", "value2" }, { "key3", "value3" }, }; byte[] result = UploadFiles("http://localhost:1234/upload", files, values); }
3、下面HttpWebRequestt
C#采用HttpWebRequest实现保持会话上传文件到HTTP的方法
我们使用 WebRequest 来获取网页内容是非常简单的，可是用他来上传文件就没有那么简单了。
如果我们在网页中上传文件，加入下面代码即可：
HTML 文件上传代码实例：
<form action ="http://localhost/test.php" method = POST> <input type = text name = uname> <input type = password name =passwd> <input type = FILE name = uploadfile> <input type=submit> </form>
但，如果在C#中使用 WebRequest 上传，必须对本地文件进行相应的处理才能提交到指定的HTTP地址，下面这个函数哦就帮我们做了这烦恼的操作
UploadFileEx 上传文件函数：
public static string UploadFileEx( string uploadfile, string url, string fileFormName, string contenttype,NameValueCollection querystring, CookieContainer cookies) { if( (fileFormName== null) || (fileFormName.Length ==0)) { fileFormName = "file"; } if( (contenttype== null) || (contenttype.Length ==0)) { contenttype = "application/octet-stream"; } string postdata; postdata = "?"; if (querystring!=null) { foreach(string key in querystring.Keys) { postdata+= key +"=" + querystring.Get(key)+"&"; } } Uri uri = new Uri(url+postdata); string boundary = "----------" + DateTime.Now.Ticks.ToString("x"); HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri); webrequest.CookieContainer = cookies; webrequest.ContentType = "multipart/form-data; boundary=" + boundary; webrequest.Method = "POST"; // Build up the post message header StringBuilder sb = new StringBuilder(); sb.Append("--"); sb.Append(boundary); sb.Append(""); sb.Append("Content-Disposition: form-data; name=\""); sb.Append(fileFormName); sb.Append("\"; filename=\""); sb.Append(Path.GetFileName(uploadfile)); sb.Append("\""); sb.Append(""); sb.Append("Content-Type: "); sb.Append(contenttype); sb.Append(""); sb.Append(""); string postHeader = sb.ToString(); byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader); // Build the trailing boundary string as a byte array // ensuring the boundary appears on a line by itself byte[] boundaryBytes = Encoding.ASCII.GetBytes("--" + boundary + ""); FileStream fileStream = new FileStream(uploadfile, FileMode.Open, FileAccess.Read); long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length; webrequest.ContentLength = length; Stream requestStream = webrequest.GetRequestStream(); // Write out our post header requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length); // Write out the file contents byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))]; int bytesRead = 0; while ( (bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0 ) requestStream.Write(buffer, 0, bytesRead); // Write out the trailing boundary requestStream.Write(boundaryBytes, 0, boundaryBytes.Length); WebResponse responce = webrequest.GetResponse(); Stream s = responce.GetResponseStream(); StreamReader sr = new StreamReader(s); return sr.ReadToEnd(); }
调用代码如下
CookieContainer cookies = new CookieContainer(); //add or use cookies NameValueCollection querystring = new NameValueCollection(); querystring["uname"]="uname"; querystring["passwd"]="snake3"; string uploadfile;// set to file to upload uploadfile = "c:\\test.jpg"; //everything except upload file and url can be left blank if needed string outdata = UploadFileEx(uploadfile, "http://localhost/test.php","uploadfile", "image/pjpeg", querystring,cookies);
