Let's assume our datastore Entity looks like below: public class Reader We shall save the file part which is submitted along with the text data into a sub directory (say /Files under the filesystem) and then save the text data along with the generated FilePath of the saved File into our datastore. Public IActionResult New(ReaderRequestModel model) The POST controller which handles this form is as below: public class ReadersController : Controller When we submit this form with relevant data, the Controller must receive and scaffold the data and return after processing it. When the controller looks at this EncodingType, it understands that the submitted data contains both Files and Text and correctly scaffolds the data into the ReaderRequestModel which we're using at the Controller end. Note that we're specifying the Form EncodingType as "multipart/form-data" since we are sending a mixed content containing both file and text.
C# file upload example code#
We shall structure a simple Form View using the built-in "asp-" Tag Helpers and Bootstrap 4 template that comes along with the AspNetCore MVC project type boilerplate code as below: We design it similar to a ViewModel which represents both the Request and Response that is handled by the API and is consumed on the front-end Form. Let's begin by creating a Model which is used to bind between our View and the Controller.
C# file upload example upgrade#
To keep things simple, we'll try to upgrade our ReaderStore which we have developed to demonstrate jQuery Form POST to AspNetCore API in a previous article.
C# file upload example registration#
Let's say we want to create a Reader registration form where any given user shall submit his name, email address and his work (as a reader in some document) and we are to store this contents in our data store for a later use. We'll look at two distinct methods of submitting Form - the MVC submit way and the jQuery ajax way.
Let's look at how we can leverage the IFormFile type in developing a simple Form that submits both text and Files to a backend API and how the submitted data can be handled in AspNetCore. IFormFile contains the file metadata of the uploaded File - such as ContentDisposition (the type of file), Name, Content in the form of a FileStream and so on. Handling File Upload in ASP.NET Core MVC ExplainedĪSP.NET Core provides with an interface IFormFile to handle the Files submitted in a POST request form at the controller.
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