(良心篇)给你们分享一篇关于C#大文件上传的整个过程

public class FileUpload
    {  
        /// 

       /// 上传文件
       /// 
       /// 文件上传到服务器的路径
       /// 要上传的本地路径（全路径）
       /// 文件上传后的名称
       /// 成功返回1，失败返回0
        public static int UpLoad_Request(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);
            //二进制对象
            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");
            //请求的头部信息
            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));
            //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（3min）
            httpReq.Timeout = 180000;
            httpReq.KeepAlive = true;
            httpReq.ProtocolVersion = HttpVersion.Version11;

            httpReq.Method = "POST";
            //对发送的数据不使用缓存   
            //httpReq.AllowWriteStreamBuffering = true;
            //设置获得响应的超时时间（300s）   
            //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8k  
                int bufferLength = 8192;
                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;
                    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")
                {
                    progressBar.Value = 100;
                    returnValue = 1;
                }
                else if (sReturnString == "Error")
                {
                    returnValue = 0;
                    progressBar.Value = 0;//错误就得重新上传，进度条置零
                }
            }
            catch(Exception ex)
            {
                  Console.WriteLine(ex.Message);
                returnValue = 0;
            }
            finally
            {
                fs.Close();
                r.Close();
            }
            return returnValue;
        }

    }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace UpFileClient
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string filePath = "";
        string FileName = "";
        private void btnSelect_Click(object sender, EventArgs e)
        {
            //创建文件弹出选择窗口（包括文件名）对象
            OpenFileDialog ofd = new OpenFileDialog();
            //判断选择的路径
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                this.txtSoundPath.Text = ofd.FileName.ToString();
            }
            filePath = this.txtSoundPath.Text;
        }

        private void btnUpLoad_Click(object sender, EventArgs e)
        {
            try {
                //上传服务器的地址（web服务）
             string address = "http://localhost:61501/WebService/SaveFileWebForm.aspx";
                //上传后文件保存的名称
                string saveName = DateTime.Now.ToString("yyyyMMddHHmmss");
                int count = FileUpload.UpLoad_Request(address, filePath, saveName, this.progressBar1);
                if (count > 0)
                {
                    MessageBox.Show("上传文件成功！");
                }
                else
                {
                    MessageBox.Show("上传文件失败！");
                }  
            }catch(Exception ex)
            {

                Console.WriteLine(ex.Message);
            }          
       }   
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace SaveFileWebService.WebService
{
    public partial class SaveFileWebForm : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Files.Count > 0)
            {
                try
                {
                    //得到客户端上传的文件
                    HttpPostedFile file = Request.Files[0];
                    //服务器端要保存的路径
                    string filePath = "D:\\Test\\" + file.FileName + ".mp3";
                    file.SaveAs(filePath);
                    //返回结果
                    Response.Write("Success");
                }
                catch
                {
                    Response.Write("Error");
                }
            }
            else
            {
                Response.Write("Error1");
            } 
        }
    }
}

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