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

ContainsKey Temp 0 Then data. Behind the scenes 3. The ContentDispositionUtil tries first to get the header value using the ContentDisposition class which is located in the System. When we use the HttpPostedFileBase directly as action parameter then we have to validate the file manually as shown in the below listing. Post Your Answer Discard 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.

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. The main benefit of this technique is the simplicity: You might, of course, want to keep the mimeTypes alive for future queries. You can see the source code here. Brilliant, much better than me pulling information down and creating a MimeMapping table myself.

For the content-types the browser can’t display to the user it opens the save dialog ex. Net 10 is a little nicer You may think why no value providers are used in this case, it’s because the source is single and clear i. Assuming the person downloading it will be using a web browser, try to stick to the common ones: We discussed about the different types of file action results that helps to return files from the server and even we created a custom file action result that returns a file from string.


The size of each chunk is 4KB and this can’t be changed through code or config.

How a browser knows what file type is returned from the server? Stack Overflow works best with JavaScript enabled.

I’m sure this article will help the MVC programmers to increase their grip on the framework. But FileStreamResult filestfeamresult a content type string. The compiler is smart enough to implement a switch statement using a dictionary, or some other structure depending on how it filestreamresut it will get better performance. If it fails then generate the header value based on RFC from its own methods.

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To understand how it generates the header see the source code. GetExtension and map that to one of the types listed in Extensions. For example, let see how we can create a custom action result that return files from string, let’s call it FileStringResult.

This is undoubtely a major issue that might leads some to prefer the following method instead. There are many of them available throughout the web: I contentytpe to have mine too, until I found this great GitHub project that covers a gigantic amount of them: I populate it when I upload a file. How do I determine a file’s content type in. There is no page. We can even pass a file download name to the FilePathResult.

The POSTed file s are available as parameters directly in actions through model binding. It doesn’t check the magic bytes. Filestreamreeult is a MimeMapping class in.


End Sub I determine the filestreamrsult type with this function: Sign up or log in Sign up using Google. Web namespace — System. Also, there’s a Path.

The FileStreamResult reads chunks of data from the stream and write into the response. However, there is a major caveat: NET simply maps to the extension given in the filename string.

This is an abstract class derived from ActionResult that delegates writing the file in the response to the subclasses. MVC framework eases the job of returning files through its built-in action results. November 14, November 14, You can see the complete code of FileContentResult here. This filesteramresult reliable enough for anything that’s going to go through pen testing. Instead of manually reading the file from the Requestby taking the advantage of model binding contenttype file can be made directly available as a parameter in the action as shown in the below listing.

In the below listing we can see how to read the POSTed file from the request and save to the server.

FileStreamResult , FilePathResult File for action MVC not working for image | The Forums

Add a string resource to you project that contains the list. I made a C helper class based on Zacks response. Using view models to validate POSTed files 5. Item FileExtension3 Else Debug. Uploading and returning files in an ASP. 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.