分享一篇关于C#大文件上传的整个过程

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简单写个小例子，记录一下此次大文件上传遇到的所有问题。

一、客户端（使用winform窗体实现）

具体功能：

- 点击“选择”按钮，选择要上传的文件
- 点击“上传文件”按钮，上传该文件调用UpLoad_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)方法
- 在客户端显示上传进度，已经时间，平均速度，上传状态，上传大小

FileUpload 文件上传类代码：

public class FileUpload
{
/// <summary>
/// 上传文件
/// </summary>
/// <param name="address">文件上传到服务器的路径</param>
/// <param name="fileNamePath">要上传的本地路径（全路径）</param>
/// <param name="saveName">文件上传后的名称</param>
/// <returns>成功返回1，失败返回0</returns>
public static int UpLoad_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)
{
int returnValue = ;
//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 = ;
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 = ;
progressBar.Value = ;
//每次上传8k
int bufferLength = ;
byte[] buffer = new byte[bufferLength]; //已上传的字节数
long offset = ; //开始上传时间
DateTime startTime = DateTime.Now;
int size = r.Read(buffer, , bufferLength);
Stream postStream = httpReq.GetRequestStream(); //发送请求头部消息
postStream.Write(postHeaderBytes, , postHeaderBytes.Length);
while (size > )
{
postStream.Write(buffer, , 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, , bufferLength);
}
//添加尾部的时间戳
postStream.Write(boundaryBytes, , 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 = ;
returnValue = ;
}
else if (sReturnString == "Error")
{
returnValue = ;
progressBar.Value = ;//错误就得重新上传，进度条置零
}
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
returnValue = ;
}
finally
{
fs.Close();
r.Close();
}
return returnValue;
} }

具体实现代码如下：

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 > )
{
MessageBox.Show("上传文件成功！");
}
else
{
MessageBox.Show("上传文件失败！");
}
}catch(Exception ex)
{ Console.WriteLine(ex.Message);
}
}
}
}

界面显示

二、服务器端-提供文件上传服务

1、创建一个web mvc项目，在创建一个webservice文件夹，在文件夹下创建一个SaveFileWebForm.axpx接口，

设置这个页面为项目起始页，打开这个页面，右键查看代码，编写服务器端代码，运行项目

项目结构：

客户端上传文件时，服务器端（SaveFileWebForm.axpx）需要访问的到，（注：先运行服务器程序项目，在运行客户端程序项目）

文件保存路径和文件保存名可以根据实际需要设置

服务器端源码：

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 > )
{
try
{
//得到客户端上传的文件
HttpPostedFile file = Request.Files[];
//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");
}
}
}
}