ASP. NET uploads multiple files at the same time, and does not use the htmlfileinput upload method (resource about File Upload)

There are many feasible solutions for uploading multiple files at the same time, as shown below:

 

Multipowupload
Http://www.element-it.com/MultiPowUpload.aspx
 
Jquery Multiple File Upload plugin
Http://www.fyneworks.com/jquery/multiple-file-upload/
 
Allowing users to upload multiple files at once
Http://www.dotnetjunkies.com/Tutorial/81E0C3A9-1B40-425C-B150-B578FE724A39.dcik
 
Uploading files using the file field control
Http://msdn.microsoft.com/en-us/library/aa478971.aspx
 
Upload multiple files Hotmail Style
Http://www.codeproject.com/KB/aspnet/multiuploads.aspx

 

However, almost all file uploads are implemented through the htmlfileinput control, because htmlfileinput is the only control specified by RFC 1867.

(RFC 1867 form-based file upload in HTMLHttp://www.ietf.org/rfc/rfc1867.txt)

 

Some strange customers do not know why, they must use a non-htmlfileinput control to upload. In this case, the following method can be used:

 

1. First use FileSystemObject OrXMLHTTPRequest object reads the file to be uploaded in binary form into a javascript variable (For details, refer to the http://www.javascripter.net/faq/reading2.htm)
2. Assign the value of this JavaScript variable to the hiddenfield of <input type = "hidden" runat = "server"/>.
3. Since this hiddenfield is runat = server, it is not difficult to get it to the server, and use system. Io to save it as a file format.

This completes the upload.

 

However, there are still many problems with this method, especially the permission of FSO. the user will not let you read his file system at will, but it is helpless. It can only be regarded as a method.

 

Currently, it is still the most practical to use ActiveX controls for HTTP uploads. Unfortunately, I will not. I will try again later.

 

 

Sincerely,
Lance Zhang
Microsoft online community support