Address reprint: https://blog.csdn.net/u012743824/article/details/79251295?utm_source=blogxgwz4
Revised finding an error (code marked red) normal use, so do the backup records to facilitate their subsequent use
When a file is large, by uploading HttpWebRequest, one might run out of memory anomalies (Out of Memory Exceptions); the second is the server response timeout occurs.
Upload large file fragmentation, is to a large file into several pieces, a piece of transmission, to avoid errors.
Client:
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 WindowsFormsApp_simple
{
public partial class Form1 : Form
{
long shardSize = 2 * 1024 * 1024;//// //以?MB为一个分片//大于2M <httpRuntime maxRequestLength="20480"/>kb为单位
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog fileDialog = new OpenFileDialog();
fileDialog.Multiselect = true;
fileDialog.Title = "请选择文件";
fileDialog.Filter = "影视图像|*.jpg;*.png;*.gif;*.mp4;*.iso";
if (fileDialog.ShowDialog() == DialogResult.OK)
{
if (fileDialog.FileNames.Length > 0)
{
this.label1.Text = fileDialog.FileNames[0];
}
}
}
private void button2_Click(object sender, EventArgs e)
{
int shardCount; //计数
int errorcount = 0;
int slice_index = 0;
long all_total_size = 0;
string file_name = this.label1.Text;
if (System.IO.File.Exists(file_name) == false)
{
return;
}
var temp_file_info = new FileInfo(file_name);
long size;
size = temp_file_info.Length; //总大小
all_total_size += size; //获取
shardCount = Convert.ToInt32(Math.Ceiling(Convert.ToSingle(size) / Convert.ToSingle(shardSize))); //总片数
string name;
name = temp_file_info.Name; //文件名
progressBar1.Maximum = shardCount;
while (slice_index < shardCount)
{
if (Uploadfile_slice(slice_index, file_name, name, size, shardCount) == true)
{
slice_index += 1;
progressBar1.Value = slice_index;
}
else
{
errorcount++;
if (errorcount > 3)
{
break;
}
}
}
if (slice_index == shardCount)
{
this.label1.Text = "上传成功！";
}
}
public Boolean Uploadfile_slice(int file_slice_index, string file, string name, long size, int shardCount)
{
var temp_file_info = new FileInfo(file);
long start;
long end;
start = file_slice_index * (shardSize);
end = Math.Min((size), start + (shardSize));
int slice_lenth = Convert.ToInt32(end - start);
string my_argument;
string[] msg;
string url = "http://localhost:4088/File/up1.aspx?";
string responseContent;
my_argument = "name=" + name + "&" + "total=" + shardCount + "&" + "size=" + size + "&" + "index=" + Convert.ToString(file_slice_index + 1);
url = url + my_argument;
byte[] my_buffer = new byte[2 * 1024 * 1024];
var webRequest = (HttpWebRequest)WebRequest.Create(url);
try
{
webRequest.Method = "POST";
webRequest.Timeout = 60000;
webRequest.ContentType = "multipart/form-data";
// webRequest.AllowWriteStreamBuffering = false;
long bytesRead; // =0
var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
fileStream.Seek(file_slice_index * shardSize, 0);
bytesRead = fileStream.Read(my_buffer, 0, slice_lenth);
var requestStream = webRequest.GetRequestStream();
requestStream.Write(my_buffer, 0, slice_lenth);
requestStream.Flush();
requestStream.Close();
var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(),
Encoding.GetEncoding("utf-8")))
{
responseContent = httpStreamReader.ReadToEnd();
}
fileStream.Close();
httpWebResponse.Close();
webRequest.Abort();
requestStream = null;
my_buffer = null;
msg = responseContent.Split(Convert.ToChar("|"));
Application.DoEvents();
if (msg[0].ToLower() == "error")
{
this.label1.Text = "上传出错！";
return false;
}
return true;
}
catch (Exception)
{
webRequest.Abort();
return false;
throw;
}
}
}
}
Server up1.aspx
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class File_up1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string msg = "";
string flag = "";
int total = 0;
long size_total = 0;
int file_index = 0;
try
{ //从Request中取参数，注意上传的文件在Requst.Files中
string name = Request["name"];
total = Convert.ToInt32(Request["total"]);
file_index = Convert.ToInt32(Request["index"]);
size_total = Convert.ToInt64(Request["size"]);
Data Request.InputStream = var;
String the dir = the Server.MapPath ( "~ / the Upload");
String file_shard = Path.Combine (the dir, name + "_" + file_index); // file sheet path and file name
string part = ""; // file portions
string file_name = Path.Combine (dir, name ); // file path and file name
IF (file_index == Total)
{
var new new FS = the FileStream (file_name, FileMode.Create);
for (int . 1 = I; I <= Total; I ++)
{
Part Path.Combine = (the dir, name + "_" + I);
var bytes = System.IO.File.ReadAllBytes (Part);
fs.Write (bytes , 0, bytes.Length);
bytes = null;
System.IO.File.Delete (Part);
}
fs.Close ();
In Flag = "OK"; // return success
}
the else
{
byte [] bytes = new new byte [data.length];
data.Read (bytes, 0, bytes.Length);
// set the start position of the current stream is a stream
data.Seek (0, SeekOrigin.Begin);
// the byte [] file write
the FileStream new new FS = the FileStream (file_shard, FileMode.Create);
the BinaryWriter the BinaryWriter new new BW = (FS);
bw.Write (bytes);
bw.close ();
fs.Close ();
}
}
the catch (Exception)
{
In Flag = "error"; // return success
}
MSG = In Flag;
Response.Write (MSG);
}
}