C# 向服务器上传文件（客服端winform、服务端web）

首先写客服端，winform模拟一个post提交：

/// <summary>         /// 将本地文件上传到指定的服务器(HttpWebRequest方法)         /// </summary>         /// <param name="address">文件上传到的服务器</param>         /// <param name="fileNamePath">要上传的本地文件（全路径）</param>         /// <param name="saveName">文件上传后的名称</param>         /// <param name="progressBar">上传进度条</param>         /// <returns>成功返回1，失败返回0</returns>         private int Upload_Request2(string address, string fileNamePath, string saveName, ProgressBar progressBar)        {            int returnValue = 0;     // 要上传的文件             FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);            BinaryReader r = new BinaryReader(fs);     //时间戳             string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");     //请求头部信息             StringBuilder sb = new StringBuilder();            sb.Append("--");            sb.Append(strBoundary);            sb.Append("\r\n");            sb.Append("Content-Disposition: form-data; name=\"");            sb.Append("file");            sb.Append("\"; filename=\"");            sb.Append(saveName);            sb.Append("\";");            sb.Append("\r\n");            sb.Append("Content-Type: ");            sb.Append("application/octet-stream");            sb.Append("\r\n");            sb.Append("\r\n");            string strPostHeader = sb.ToString();            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);     // 根据uri创建HttpWebRequest对象             HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));            httpReq.Method = "POST";     //对发送的数据不使用缓存             httpReq.AllowWriteStreamBuffering = false;     //设置获得响应的超时时间（300秒）             httpReq.Timeout = 300000;            httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;            long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;            long fileLength = fs.Length;            httpReq.ContentLength = length;            try            {                progressBar.Maximum = int.MaxValue;                progressBar.Minimum = 0;                progressBar.Value = 0;                //每次上传4k                int bufferLength = 4096;                byte[] buffer = new byte[bufferLength]; //已上传的字节数                 long offset = 0;         //开始上传时间                 DateTime startTime = DateTime.Now;                int size = r.Read(buffer, 0, bufferLength);                Stream postStream = httpReq.GetRequestStream();         //发送请求头部消息                 postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);                while (size > 0)                {                    postStream.Write(buffer, 0, size);                    offset += size;                    progressBar.Value = (int)(offset * (int.MaxValue / length));                    TimeSpan span = DateTime.Now - startTime;                    double second = span.TotalSeconds;                    lblTime.Text = "已用时：" + second.ToString("F2") + "秒";                    if (second > 0.001)                    {                        lblSpeed.Text = "平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";                    }                    else                    {                        lblSpeed.Text = " 正在连接…";                    }                    lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";                    lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";                    Application.DoEvents();                    size = r.Read(buffer, 0, bufferLength);                }                //添加尾部的时间戳                 postStream.Write(boundaryBytes, 0, boundaryBytes.Length);                postStream.Close();         //获取服务器端的响应                 WebResponse webRespon = httpReq.GetResponse();                Stream s = webRespon.GetResponseStream();                //读取服务器端返回的消息                StreamReader sr = new StreamReader(s);                          String sReturnString = sr.ReadLine();                s.Close();                sr.Close();                if (sReturnString == "Success")                {                    returnValue = 1;                }                else if (sReturnString == "Error")                {                    returnValue = 0;                }            }            catch            {                returnValue = 0;            }            finally            {                fs.Close();                r.Close();            } return returnValue;        }

参数说明如下：

address：接收文件的URL地址，如：http://localhost/UploadFile/Save.aspx

fileNamePath：要上传的本地文件，如：D:\test.rar

saveName：文件上传到服务器后的名称，如：200901011234.rar

progressBar：显示文件上传进度的进度条。

接收文件的WebForm添加一个Save.aspx页面，Load方法如下：

protected void Page_Load(object sender, EventArgs e)    {        if (Request.Files.Count > 0)        {            try            {                HttpPostedFile file = Request.Files[0];                //string filePath = "C:\\Documents and Settings\\Administrator\\桌面\\2\\" + file.FileName;//this.MapPath("UploadDocument")                string filePath = "D:\\SourceSafe\\testupform\\" + file.FileName;                file.SaveAs(filePath);                Response.Write("Success");            }            catch            {                Response.Write("Error");            }        }        else        {            Response.Write("Error1");        }    }

同时需要配置WebConfig文件的httpRuntime 如下：

<httpRuntime maxRequestLength="102400" executionTimeout="300"/>

不能的话最大只能上传4M了。要是想上传更大的文件，maxRequestLength，executionTimeout设置大些，同时WinForm下的代码行

//设置获得响应的超时时间（300秒）
httpReq.Timeout = 300000;

也要修改，另外别忘了看看IIS的连接超时是否设置为足够大。

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