<summary>
Uploading local files to the specified server (HttpWebRequest method)
</summary>
<param name= "Address" > Files uploaded to the server </param>
<param name= "Filenamepath" > local file to upload (full path) </param>
<param name= "Savename" > file name after upload </param>
<param name= "ProgressBar" > Upload progress bar </param>
<returns> successfully returned 1, failed to return 0</returns>
private int Upload_request (string address, String Filenamepath, String savename, ProgressBar ProgressBar)
{
int returnvalue = 0; The file to upload
FileStream fs = new FileStream (Filenamepath, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader (FS); Time stamp
String strboundary = "----------" + DateTime.Now.Ticks.ToString ("x");
byte[] Boundarybytes = Encoding.ASCII.GetBytes ("\r\n--" + strboundary + "\ r \ n"); Request header Information
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); To create a HttpWebRequest object from a URI
HttpWebRequest Httpreq = (HttpWebRequest) webrequest.create (new Uri (address));
Httpreq.method = "POST"; Do not use caching for sent data
Httpreq.allowwritestreambuffering = false; Set time-out for response (300 seconds)
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; 4k per upload
int bufferlength = 4096;
byte[] buffer = new Byte[bufferlength]; Number of bytes uploaded
Long offset = 0; Start upload Time
DateTime startTime = DateTime.Now;
int size = r.read (buffer, 0, bufferlength);
Stream Poststream = Httpreq.getrequeststream (); Send Request Header Message
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 = "Elapsed:" + second. ToString ("F2") + "second";
if (Second > 0.001)
{
Lblspeed.text = "Average Speed:" + (Offset/1024/second). ToString ("0.00") + "kb/second";
}
Else
{
lblspeed.text = "Connecting ...";
}
Lblstate.text = "Uploaded:" + (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);
}
Add a timestamp for the trailer
Poststream.write (boundarybytes, 0, boundarybytes.length);
Poststream.close (); Get the server-side response
WebResponse webrespon = Httpreq.getresponse ();
Stream s = Webrespon.getresponsestream ();
StreamReader sr = new StreamReader (s); Read messages returned by the server side
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;
The parameter description is as follows: Address: The URL of the receiving file, such as: http://localhost/UploadFile/Save.aspx filenamepath: Local file to upload, such as: D:\test.rar Savename: The name of the file uploaded to the server, such as: 200901011234.rar ProgressBar: A progress bar showing the progress of the file upload. Receive the file WebForm add a save.aspx page, Load method is as follows: protected void Page_Load (object sender, EventArgs e)
{
if (Request.Files.Count > 0)
{
Try
{
Httppostedfile file = Request.files[0];
String FilePath = this. MapPath ("uploaddocument") + "\ \" + file. FileName;
File. SaveAs (FilePath);
Response.Write ("success\r\n");
}
Catch
{
Response.Write ("error\r\n");
}
}
The HttpRuntime to configure the Webconfig file is as follows:
WinFormThe code line below//sets the timeout time to get the response (300 seconds)
Httpreq.timeout = 300000;
Also, do not forget to check if the connection timeout for IIS is set to large enough.
Reference:
Http://blogs.msdn.com/johan/archive/2006/11/15/are-you-getting-outofmemoryexceptions-when-uploading-large-files.aspx
Go C # use HttpWebRequest to upload files and show progress under WinForm
