ASP.NET - Limit file upload available file types

Question

I have added a file upload to my asp.net website. However, I want to limit the file types that user can select. For example, I only the user to select mp3 files. How can I a

Answer 1

As stated above, it's not possible out of the box.

The simpler solution that I've found: use a RegularExpressionValidator to check the file extension. No need for JavaScript or external libraries. Of course, it only checks the extension, not the file content (you must use server-side code and inspect the bytes), and does not change anything to the file list displayed in the folder browser.

<asp:RegularExpressionValidator ControlToValidate="FileUpload1" ValidationExpression="^.*\.(mp3|MP3)$" runat="server" />

Answer 2

Use the following code js code for to only select the required file type which we want to select. IN the below example I want to select only zip file, On browse it only shows the zip file extension file name

  (function ($) {
            $.fn.acceptFileType = function (types) {
                if (types == undefined) {
                    return true;
                } else {
                    types = types.split(",")
                }
                this.each(function () {
                    $(this).bind("change", function () {
                        if (!$.inArray($(this).val().replace(/([\d\w.]+)(\.[a-z0-9]+)/i, '\2'), types)) {
                            $(this).val('');
                            return false;
                        }
                        return true;
                    });
                });
            };
        })(jQuery);
        $(":file").acceptFileType(".zip");
        
        
        
         <input type="file" id="txtFileUploadGrid" runat="server" accept=".zip,application/octet-stream,application/zip,application/x-zip,application/x-zip-compressed" />
        
        
        
        

Answer 3

There is no problem. Here it is!

<asp:FileUpload ID="FileUpload1" runat="server" accept=".mp3"/>

Answer 4

It's not possible with the FileUpload control in ASP.NET, but the following link may help:

http://forums.asp.net/p/1136820/1817938.aspx