Many posts in internet says that HttpPostedFileBase is a read only and we cannot change the content type. Can anybody let me know how we. Just make sure you derive your custom attribute class from the ValidationAttribute base class and apply it to HttpPostedFileBase properties in. The HttpPostedFileBase is created to substitute HttpPostedFile in MVC .. For example, to return a pdf file from the server the Content-Type.

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But what we are interested here is to know the supporting classes. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. What I have tried: The below code snippet shows how we can return a file just plain from an action without using action results.

Read the question carefully. 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.

Validate uploaded image file in MVC 5 HttpPostedFileBase

Can anybody let me know how we can change the content type of HttpPostedFileBase. We can even pass a file download name to the FilePathResult. Sign up using Email and Password. For the content-types the browser can’t display to the user it opens the save dialog ex.

The “What I Tried” section should show the code you tried if you tried anything at all. Returning files through action results 7. Insults are not contenthype.

Well, in this article I gathered the important concepts that are scattered in different posts, threads in a single place. Don’t tell someone to read the manual.

content-type – Как получить содержимое/тип файла во время выполнения – Qaru

Thanks for sharing with us. Never mind got it working.


Thaks – I have changed the foreach to: POSTing a file to the server is quite simple. Here’s a reliable way to achieve that by looking at the contents of the file: We don’t need to worry about adding any headers in the response the action results will take care. Understand that English isn’t everyone’s first language so be lenient of bad spelling and grammar.

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Treat my content as plain text, not as HTML. I have a controller like this: Sign up or log in Sign up using Google. When the user want to save the file sent to the browser, the server can suggest a filename to the client and the Content-Disposition header is just for that.

Kristian Jay 81 7. So uploading a single file and reading it from the server is quite easy, all we need is to set the HttpPostedFileBase type as a parameter in the corresponding action method. You are commenting using your Twitter account. Many posts in internet says that HttpPostedFileBase is a read only and we cannot change the content type.

Thanks for this great solution. The extension of the uploaded file is valid? For some content types the browser doesn’t open the save dialog and display the content directly inside its window.

Validate uploaded image file in MVC 5 HttpPostedFileBase – Just Simply Code

If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. This site uses cookies. There are three built-in classes that implements FileResult: To find out more, including how to control cookies, see here: Adding the Content-Type header is not a big deal while determining the value of the Content-Disposition header is not an easy job and the FileResult class uses a private class ContentDispositionUtil for that purpose.


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. How to return a file as response? 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. Finally we have to replace the action parameter from HttpPostedFileBase to UploadFileModel and the validations will happen automatically when the binding happens.

If you forget setting the proper encoding type then only the filename is submitted not the file. What you always have to check: Behind the scenes 3. When we use the HttpPostedFileBase directly as action parameter then we have to validate the file manually as shown in the below listing.

Instead of manually reading the file from the Requestby taking conenttype advantage of model binding the file can be made directly available as a parameter in the action as shown in the below listing. Email required Address never made public. Darin Dimitrov k Notify me of new posts via email.

Reading files from request 3. DataAnnotations namespace to the properties of your model or view-model, and you magically have a working validation without messing up your code.

How a browser knows what file type is returned from the server?