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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FileStreamResult Class () | Microsoft Docs

Will k 45 I made a C helper class based on Zacks response. This is just a starting point. Using view models to validate POSTed files 5. I dont know fileshreamresult language are you using but this is in vb. There are already plenty of articles written on this subject. How to return a file as response?

Add a string resource to you project that contains the list. Post as a guest Name. Item FileExtension2 Else Debug.

The MVC framework is designed in such a way that these two components are loosely coupled and hence a binder don’t need to worry about which value provider it has to interact to get the value for a property or parameter likewise a value provider don’t need to worry about who is asking the value.

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

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. November 5, November 5, GetExtension and map that to one of the types listed in Extensions. StriplingWarrior, or keep a single static dictionary. Thanks for all the readers who pointed out the errors and typos in the article.

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Как определить тип содержимого файла в .NET?

This class contains a single abstract method called WriteFile that every subclass should implement. NET simply maps to the extension given in the filename string. TryGetValue extension, out mime? Sign up using Facebook.

Brilliant, much better than me pulling information down and creating a MimeMapping table myself. How to Deploy a ASP.

Split ” ” If Not data. How do I determine a file’s content type in. We don’t need to worry about adding any headers in the response the action results will take care.

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. Assuming the person downloading it will be using a web browser, try to stick to the common ones: This is an abstract class derived from ActionResult that delegates writing the file in the response to the subclasses.

The main benefit of this technique is the simplicity: The important thing is the name of the file input controls should match the rules of model binding. The files in the server can be easily sent as response to the clients through its rich support of action results. We can easily create new file action results by deriving from the the abstract class FileResult.

Uploading and returning files in MVC

There are many of them available throughout filestreamtesult web: Notify me of follow-up comments by email. StriplingWarrior, yep, you’ve got a point on this, the compiler is able to do some white magic with the final code.


For example, let see how we can create a custom action result that return files from cntenttype, let’s call it FileStringResult. How about reading multiple files POSTed to the server?

However, there is a major caveat: Uploading multiple files 5. I used to have mine too, until I found this great GitHub project that covers a gigantic amount of them: Finally we have to replace the action parameter from HttpPostedFileBase to UploadFileModel and the validations will happen automatically when the binding happens.

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 contfnttype to check the file size, file name etc. The ContentDispositionUtil tries first to get the header value using the ContentDisposition class which is located in the System.

Instead of doing it manually it would be great if you could do that using data annotation attributes and for that we have to use view models. In the below listing we can see how to read the POSTed file from the request and save to the server.