for ( int i = 0 i )ĮrrorDisplay.ShowError( 'File ' + file.FileName + ' is too large. Below is an example I use in app to capture a number of images uploaded and store them into a database using a business object and EF 4.2. Instead you can only reliably retrieve files by their index. This means I can't easily retrieve files by their name: HttpPostedFileBase file = Request.Files īecause there will be multiple files for a given name. In other words if I select 3 files to upload on the File1 control shown above I get three file form variables named File1.

When multiple files are uploaded from a single file control, they are assigned the same name. When you upload files to an ASP.NET server there are a couple of things to be aware of. Capturing Files on the Server with ASP.NET Likewise I could use text/* for all text formats registered on the machine or text/xml to only show XML files (which would include xml,xst,xsd etc.). Note that you can also specify the accept attribute in the tag, which specifies a mime-type to specify what type of content to allow.Here I'm only allowing images (image/*) and the browser complies by just showing me image files to display. Most other browsers display the standard file input box and display the multiple filenames as a comma delimited list in the textbox.

For example Chrome displays 3 files selected as text next to the Browse… button when I choose three rather than showing any files in the textbox. The UI for this can be different in some browsers. Note that I can select multiple images in the dialog all of which get stored in the file textbox. Here I'm using Firefox using the thumbnail preview I can easily pick images to upload on a form: Now when the file open dialog pops up - depending on the browser and whether the browser supports it - you can pick multiple files. To create a file input box that allows with multiple file support you can simply do: Where you might have required many file upload controls before to upload several files, one File control can potentially do the job.

All the new features allow for is to make it easier to select multiple images from disk in one operation. For that you will still need some sort of library (I'll post an example in my next blog post using plUpload). Please understand though, that even though you can send multiple files using the tag, the process of how those files are sent hasn't really changed - there's still no progress information or other hooks that allow you to automatically make for a nicer upload experience without additional libraries or code. This is actually a very subtle change that's very useful as it makes it much easier to send multiple files to the server without using complex uploader controls. Per HTML5 spec the tag allows for multiple files to be picked from a single File upload button.

Html5 multiple file upload example