uploading multiple files with restrictions

Home ›

ASP.NET Forums » General ASP.NET » Getting Started » uploading multiple files with restrictions

Previous Next

uploading multiple files with restrictions

Last post 05-19-2008 7:03 PM by amereto2k. 7 replies.

Sort Posts:

uploading multiple files with restrictions

05-16-2008, 9:21 PM

Contact

Loading...
amereto2k
Joined on 01-30-2006, 11:31 AM
Posts 195

hi,

i am using the HttpFileCollection class to upload multiple files on one page.

What I want to add is code to restrict files that dont have a jpg or gif format to be uploaded.

I have tried various ways link using getextension method but cant seem to get it working.

The code is included beow if anybody can spell out the necessary code be much appreciated

Amereto

CodeBehind Page

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class FU5 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

string filepath = "C:\\FileUpload\\images";

HttpFileCollection uploadedFiles = Request.Files;

for (int i = 0; i < uploadedFiles.Count; i++)

{

HttpPostedFile userPostedFile = uploadedFiles[i];

try

{

if (userPostedFile.ContentLength > 0)

{

Label1.Text += "<u>File #" + (i + 1) +

"</u><br>";

Label1.Text += "File Content Type: " +

userPostedFile.ContentType + "<br>";

Label1.Text += "File Size: " +

userPostedFile.ContentLength + "kb<br>";

Label1.Text += "File Name: " +userPostedFile.FileName + "<br>";

userPostedFile.SaveAs(filepath + "\\" +

System.IO.Path.GetFileName(userPostedFile.FileName));

Label1.Text += "Location where saved: " +

filepath + "\\" +

System.IO.Path.GetFileName(userPostedFile.FileName) +"<p>";

}

catch (Exception Ex)

{

Label1.Text += "Error: <br>" + Ex.Message;

}

ASPX Page

<title>Upload Files</title>

</head>

<body>

<div>

<asp:FileUpload ID="FileUpload1" runat="server" />

<br />

<asp:FileUpload ID="FileUpload2" runat="server" />

<br />

<asp:FileUpload ID="FileUpload3" runat="server" />

<br />

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click"

Text="Upload File" /> <br />

<br />

<asp:Label ID="Label1" runat="server"></asp:Label>

<br />

</div>

</form>

</body>

</html>

Re: uploading multiple files with restrictions

05-16-2008, 11:16 PM

Contact

Loading...
dinesh_sp
Joined on 12-03-2007, 5:41 AM
Melbourne
Posts 409

You can check extension by System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();-->return extension of uploaded file.

Or can do same by regex in regex validator.

But I would prefer checking serverside as it is more secure.

Hope this helps

Re: uploading multiple files with restrictions

05-16-2008, 11:29 PM

Contact

Loading...
jchandra
Joined on 05-15-2008, 9:36 AM
Jakarta, Indonesia
Posts 197

Looks like time to do some client side scripting here since trying to detect this from the server require for at least some / all part of the content get transfered first and if any of them is a big file, you'll just have to wait a while before you can even validate, cancel or whatever.

Here is an example of how to get the value of the control in javascript when a button is pressed. Put that inside a script tag on your html source at the bottom of the page

1    window.onload = function() {
2        document.getElementById("Button1").onclick = function() {
3            var re = /.+\.(gif|jpg)$/i; //regex for testing if a string is ending with gif or jpg
4            var u1 = document.getElementById("FileUpload1").value;
5            var u2 = document.getElementById("FileUpload2").value;
6            var u3 = document.getElementById("FileUpload3").value;
7            
8            //If all of these uploader contain the right combo, upload them
9            if (re.test(u1) && re.test(u2) && re.test(u3))
10           {
11               return true;
12           }
13           else
14           {
15               alert("EEEK!! Only gif or jpg is allowed");
16               return false;
17           }
18       }
19   }
20

Jimmy Chandra
Blogging at Incoherent Rambling

Mark this post as Answer if you think it helped you solve the problem.

Re: uploading multiple files with restrictions

05-16-2008, 11:45 PM

Contact

Loading...
jchandra
Joined on 05-15-2008, 9:36 AM
Jakarta, Indonesia
Posts 197

dinesh_sp:
But I would prefer checking serverside as it is more secure.

Agree, you should recheck these on the server side, but you should also do client side checking just to prevent the waste of bandwidth.

Jimmy Chandra
Blogging at Incoherent Rambling

Mark this post as Answer if you think it helped you solve the problem.

Re: uploading multiple files with restrictions

05-17-2008, 4:53 AM

Contact

Answer

Loading...
Haissam
Joined on 10-05-2006, 2:25 AM
Beirut - Lebanon
Posts 4,682

Check below link

Upload multiple files in ASP.NET

Haissam Abdul Malak
MCAD.NET
| Blog |

Re: uploading multiple files with restrictions

05-17-2008, 4:54 AM

Contact

Loading...
amereto2k
Joined on 01-30-2006, 11:31 AM
Posts 195

Hi thank you for the reply.

the thing is I have 4 file upload controls on the page and just using fileupload1 is not enough.

Therefore i am using the HttpPostedfile - and looping through to get each file.

I still need to find the code that checks each one for jpg of gif and think i can use the getextension method

but not sure where it all fits together in the code below?

rgds

amereto

Re: uploading multiple files with restrictions

05-17-2008, 6:30 AM

Contact

Loading...
pradeepsahoo
Joined on 03-18-2008, 11:37 AM
Pune
Posts 154

Hello Dear

Try this code it will solve ur problem,

code:

Protected Sub AddFile_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles AddFile.Click
        Dim ext As String = System.IO.Path.GetExtension(FindFile.PostedFile.FileName)

        If Not FindFile.Value = "" Then
            If ext = ".gif" Or ext = ".jpeg" Or ext = ".png" Or ext = ".doc" Or ext = ".txt" Or ext = ".pdf" Then
                If hif.Count <= 4 Then
                    hif.Add(FindFile)
                    ListBox1.Items.Add(System.IO.Path.GetFileName(FindFile.PostedFile.FileName))
                    Dim i As String = System.IO.Path.GetFileName(FindFile.PostedFile.FileName)
                Else
                    ScriptManager.RegisterStartupScript(Me, Me.GetType(), "myscript", "alert('Maximum File Limit is 5.');", True)
                End If
            Else
                ScriptManager.RegisterStartupScript(Me, Me.GetType(), "myscript", "alert('Extension of the File is not valid...');", True)
            End If
        Else
            ScriptManager.RegisterStartupScript(Me, Me.GetType(), "myscript", "alert('Choose File to Add...');", True)
        End If
    End Sub

======================================
Regard,
Pradeep Sahoo
Sr. Sofware Developer
Don't forget to click "Mark as Answer" on the post that helped you.

Re: uploading multiple files with restrictions

05-19-2008, 7:03 PM

Contact

Loading...
amereto2k
Joined on 01-30-2006, 11:31 AM
Posts 195

Hi,

do you have that in C sharp by any chance? Oven ready?

Page 1 of 1 (8 items)

RSS Available

Advertise on ASP.NET

About this Site