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How to exclude specific file extension?

Last post 05-26-2009, 11:40 PM by cutechat. 3 replies.
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  •  05-24-2009, 9:21 PM 52445

    How to exclude specific file extension?

    Reply Quote
    Hi, I am new here.
     
    The UploaderValidateOption class has a property AllowedFileExtensions, but it doesn't have a property to restrict file extensions.
     
    Is there anyway to do this as manually enter all the allowed file extensions is not a viable option? Any feedback will be appreciated.

  •  05-25-2009, 8:58 AM 52464 in reply to 52445

    Re: How to exclude specific file extension?

    Reply Quote
    Please check this sample:
     
     
     
    1. <%@ Page Language="C#" Title="First sample" %>  
    2. <%@ Import Namespace="CuteWebUI" %>  
    3. <%@ Register TagPrefix="CuteWebUI" Namespace="CuteWebUI" Assembly="CuteWebUI.AjaxUploader" %>  
    4. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">  
    5.   
    6. <script runat="server">  
    7.   
    8.     string disabledExtList = "aspx,asp,ashx,html,htm,mht,exe,dll,php,jsp";   
    9.   
    10.     void InsertMsg(string msg)   
    11.     {   
    12.         ListBoxEvents.Items.Insert(0, msg);   
    13.         ListBoxEvents.SelectedIndex = 0;   
    14.     }   
    15.     protected void UploadAttachments1_AttachmentAdded(object sender, AttachmentItemEventArgs args)   
    16.     {   
    17.         InsertMsg("Added.." + args.Item.FileName);   
    18.     }   
    19.   
    20.     protected void UploadAttachments1_FileValidating(object sender, UploaderEventArgs args)   
    21.     {   
    22.         //validate the extensions , this is very important!   
    23.         //the client side validation is not safe , double check it here:   
    24.         string ext=Path.GetExtension(args.FileName).TrimStart('.').ToLower();   
    25.         ext = "," + ext + ",";   
    26.         string list="," + disabledExtList.ToLower() + ",";   
    27.         if (list.IndexOf(ext) != -1)   
    28.         {   
    29.             throw (new Exception("Invalid file type!"));   
    30.         }   
    31.     }   
    32. </script>  
    33.   
    34. <html xmlns="http://www.w3.org/1999/xhtml">  
    35. <head id="Head1" runat="server">  
    36. </head>  
    37. <body>  
    38.     <form id="Form1" runat="server">  
    39.         <CuteWebUI:UploadAttachments runat="server" ID="UploadAttachments1" OnAttachmentAdded="UploadAttachments1_AttachmentAdded" OnFileValidating="UploadAttachments1_FileValidating">  
    40.         </CuteWebUI:UploadAttachments>  
    41.         <br />  
    42.         <div>  
    43.             Server Trace:   
    44.             <br />  
    45.             <asp:ListBox runat="server" ID="ListBoxEvents" Width="800"></asp:ListBox>  
    46.         </div>  
    47.     </form>  
    48.     <script type="text/javascript">  
    49.     var disabledExtList='<%=disabledExtList %>'  
    50.     </script>  
    51.     <script type="text/javascript">  
    52.     //validate the extensions in client side   
    53.     //this way is not safe , just for performance   
    54.     //try to disable it to test the server validation   
    55.     var useclientvalidation=true;   
    56.     function CuteWebUI_AjaxUploader_OnSelect(files)   
    57.     {   
    58.         if(useclientvalidation)   
    59.         {   
    60.             var list=","+disabledExtList+",";   
    61.             for(var i=0;i<files.length;i++)   
    62.             {   
    63.                 var fps=files[i].FileName.split('.');   
    64.                 var ext=fps[fps.length-1].toLowerCase();   
    65.                 ext=","+ext+",";   
    66.                 if(list.indexOf(ext)!=-1)   
    67.                 {   
    68.                     alert("Javascript : Invalid file type : "+ext);   
    69.                     //cancel it.   
    70.                     return false;   
    71.                 }   
    72.             }   
    73.         }   
    74.     }   
    75.     </script>  
    76.   
    77. </body>  
    78. </html>  
    Regards,
    Terry

  •  05-25-2009, 11:36 PM 52493 in reply to 52464

    Re: How to exclude specific file extension?

    Reply Quote
    Thank you for your quick reply.
     
    Is is possible to validate the files before uploading? The FileValidating event seems to fire up after file is uploaded.

  •  05-26-2009, 11:40 PM 52535 in reply to 52493

    Re: How to exclude specific file extension?

    Reply Quote
    Hi,
     
    the script 
     
    function CuteWebUI_AjaxUploader_OnSelect(files)   
     
    is just for validating it at client side.
     
    Regards,
    Terry
     
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