Using asp.net to design ftp file uploads (middle)

Three The important steps in software design and the concrete solutions

One. Select the file to upload to the server locally

First of all, thanks to the powerful features of ASP.net, he provided the HTML control elements, making it easy for us to select the file to upload through a dialog box. Of course, your browser must also be IE 3.02 or Netscape 3.0 version or a higher version of the browser. You can complete the work of selecting a local file by using the following statement:

<input id = "Lofile" type = "file" runat = "server" >

Two. In order to successfully complete the file upload, the encoding in form must be "multipart/form-data" instead of the default encoding "Application/x-www-form-urlencoded" from. The specific code is as follows:

<form method = "POST" enctype = "multipart/form-data" runat = "server" >
</form >

Three. Get the uploaded file name and some action on the disk

In order to obtain the uploaded file name, a namespace (NAMESAPCE)--system.io must be introduced. This namespace defines a number of classes on file and disk operations, in which some of the features of the software are accomplished through some of the methods and properties of these classes.

(1). Get the name of the uploaded file

Use the GetFileName method in the path class, as follows:
Lstrfilename = LoFile.PostedFile.FileName
' Note: LoFile.PostedFile.FileName returns the file name selected through the file dialog box,
This contains the directory information for the file
Lstrfilename = Path.getfilename (lstrfilename)
' Remove directory information, return file name

(2). To determine whether the upload directory exists, does not exist on the establishment

Create a directory to use the CreateDirectory method in the Directory class to determine if the directory exists to use the Exists method in the Directory class. Specifically as follows:

If (not directory.exists (Lstrfilefolder)) Then
Directory.CreateDirectory (Lstrfilefolder)
End If
' Note: Lstrfilefolder is the directory name that the user fills in, or the default directory name

Four. Upload selected files to the server

Before the work has been completed, you can upload files, upload files relatively simple, use the following 2 lines of statements can be completed upload work.

Lstrfilenamepath = Lstrfilefolder & Lstrfilename
' Get uploaded directory and file name
LoFile.PostedFile.SaveAs (Lstrfilenamepath)
' Uploading files to the server

Five. To obtain and display the properties of the uploaded file

Filename.text = Lstrfilename
' Get file name
Filetype.text = LoFile.PostedFile.ContentType
' Get file type
Filelength.text = CStr (loFile.PostedFile.ContentLength)
' Get file length
Fileuploadform.visible = False
Answermsg.visible = True
' Show upload file properties

The above is the software in the preparation of some of the more important places.