Here we have 3 file input fields with different names: profilePictureFile, photoIDFile and documentFile. So we add 3 file input to the form like this: Note that the uploaded files will be stored in the file system on the server side.Suppose that we want to show a form in which the user is required to pick 3 files to be uploaded. For getting-started tutorial, you may need to check this Spring Boot File Upload Tutorial first.
Mvc file upload example code#
In this post, I will share some code examples demonstrating uploading multiple files in a Java web application based on Spring Boot. Next, make sure your application startup (Startup.cs) is configured to correctly use MVC and has the following line present (add it if not): services.AddMvc() Return new FileContentResult(taskFile?.FileData, taskFile?.FileContentType) Var cd = new .ContentDispositionHeaderValue("attachment") which assumes it's an object with relevant properties as required below Public FileContentResult Download(int attachmentId) Public class FileHandlingController : ControllerBase
Mvc file upload example download#
So, at the time of writing, you cannot achieve this using vanilla Blazor/Razor without embedding an MVC controller to handle the file download part an example of which is as below: using It's a bit of a minefield if (also like me) Blazor is your first forray into the MVC-type world, as the documentation isn't as helpful for such 'menial' tasks. If, like me, you've come to this topic via Razor components as you're learning Blazor, then you'll find you need to think a little more outside of the box to solve this problem. an entity class for the document in my database Return File(document.Data, document.ContentType)
(HeaderNames.ContentDisposition, cd.ToString()) Var cd = new ContentDispositionHeaderValue("attachment") "inline" means let the browser try and handle it "attachment" means always prompt the user to download While the code below is from my most recent incarnation of this problem in an ASP.NET Core (Full Framework) app, it should work with minimal changes in an older MVC application as well since I'm using the .ContentDispositionHeaderValue class. I've since updated my implementation to fix this. The warning on the accepted answer below that was added by Oskar regarding international characters is completely valid, and I've hit it a few times due to using the ContentDisposition class. This questions seems to strike a chord with a lot of people, so I thought I'd post an update.
Return new FileStreamResult(new MemoryStream(document.Data), document.ContentType) Gives me a download prompt (lose the ability to open by default if known type) Opens if it is a known extension type, downloads otherwise (download has bogus name and missing extension) Return File(document.Data, document.ContentType, document.Name) These are the examples of what I've tried so far. If I force the file name by specifying it, I lose the ability for the browser to open the file directly and I get a download prompt. I have tried FileStreamResult and it works for most files, its constructor doesn't accept a filename by default, so unknown files are assigned a file name based on the URL (which does not know the extension to give based on content type). But I also want to keep a download link off to the side so that I can force a download prompt regardless of the file type. However, if I choose to view a file called SomeRandomFile.pdf or SomeRandomFile.jpg I want the file to simply open. If I choose to view a file called SomeRandomFile.bak and the browser doesn't have an associated program to open files of this type, then I have no problem with it defaulting to the download behavior. What I want is a view listing two links, one to view the file and let the mimetype sent to the browser determine how it should be handled, and the other to force a download. I'm encountering a problem sending files stored in a database back to the user in ASP.NET MVC.
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