A small class to retrieve the MIME Type of any file and/or extension in C# using Windows Registry or a static MIME Type Map for I have even tried FilePathResult and FileStreamResult nothing works public FileResult “must-revalidate”); return File(path, contentType); }. Я заменил столбец FileExtension в моей таблице базы данных столбцом ContentType. Я заполняю его, когда я загружаю файл. Private Sub.

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POSTing a file to the server is quite simple. Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes. So far we have seen how to upload files to server and validate them using data annotations.

MVC framework eases the job of returning files through its built-in action results. Also, there’s a Contehttype. Sign up using Email and Password. Instead of manually reading the file from the Requestby taking the advantage filestresmresult model binding the file can be made directly available as a parameter in the action as shown in the below listing. NET simply maps to the extension given in the filename string. StriplingWarrior, yep, you’ve got a point on this, the compiler is able to do some white magic with the final code.

The important thing is the name of the file input controls should match the rules of model binding. Example, when you return a pdf file, some browsers knows how to display the pdf files inside it, same for images.


Uploading and returning files in MVC

There is a MimeMapping class in. The main benefit of this technique is the simplicity: I use a custom config section in web.

You might, of course, want to keep the mimeTypes alive for future queries. To understand how it generates the header see the source code. Uploading and returning files in an ASP. The below code snippet shows how we can return a file just plain from an action without using action results.

My WPF application gets a file from the user with Microsoft. How a browser knows what file type is returned from the server?

FileStreamResult(Stream, String) Constructor () | Microsoft Docs

But what we are interested here is to know the supporting classes. When we use the HttpPostedFileBase directly as action parameter then we have to validate the file manually as shown in the below listing. Using view models to validate POSTed files 5.

Display is one of its Views. How about reading multiple files POSTed to the server? Finally we have to replace the action parameter from HttpPostedFileBase to UploadFileModel and the validations will happen automatically when the binding happens. We can even pass a file download name to the FilePathResult.

Как определить тип содержимого файла в .NET?

It looks like you still have the filename when you go to set the content type. Generic ; using System. The files in the server can be easily sent filestreamredult response to the clients through its rich support of action results. Creating custom file action result In this article we learnt many things about uploading and returning files in an MVC application.


Get a File Content-Type / MIME-type from file extension in ASP.NET C#

To return a file from server all we have to do is set the proper Content-TypeContent-Disposition headers and write the file into the response. Item FileExtension2 Else Debug.

So why another article? Still, I’d choose a dictionary, because it will provide me with a little more flexibility than a switch statement, and I can fill it with external data, maybe coming from a configuration or database. I’ve replaced the FileExtension column in my database table with a ContentType column.

The below listing shows the simplified version of the upload action after using view model. Thanks for all the readers who pointed out the errors and typos in the article. For example, in the case of image we need the file should be one of the supported image types like jpg, jpeg, png by the server and we may also need validations to check the file size, file name etc. There are many of them available throughout the web: When you have a single instance of HttpPostedFileBase as an action parameter or a property in model then mapping the file is completely done by the HttpPostedFileBaseModelBinder and no value providers are used in this case.

Item FileExtension1 Else Debug.

Net 10 is a little nicer