Add the following else if condition to this method: //1 else if result is ORKFileResult { let fileResult = result as! ORKFileResult //2 retDict[“contentType”] = fileResult. A slightly more sophisticated example is the FileResult class. This class supplies a public property, the ContentType property that contains the. For example, to return a pdf file from the server the Content-Type should FileResult: FilePathResult, FileContentResult and FileStreamResult.

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The value providers are the components that gets the value needed from the particular source query-strings, form etc.

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

This class mainly does the job of adding Content-Type and Content-Disposition headers into the response. November 5, November 5, Step 3 Name the controller as in the following: Finally we have to replace the action parameter from HttpPostedFileBase to UploadFileModel and the validations will happen automatically when the binding happens.

But what we are interested here is contentype know the supporting classes. In the above action we have done couple of validations against the uploaded file. Controller helper methods to return files 9. This is an abstract class derived from ActionResult that delegates writing the file in the response to the subclasses. Step 6 Add a title to the index page. 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.

You can find the file in the download folder. November 14, November 14, 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. Thanks for all the readers who pointed out the errors and typos in the article.


Step 5 Name the view and select “Empty without model ” as the template. Well, in this article I gathered the important concepts flieresult are scattered in different posts, threads in a single place. How a browser knows what file type is returned from the server? Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes.

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

You may think why no value providers are used in this case, it’s because the source is single and clear i. Like any other input data the POSTed files to the server also needs validation. I’m sure this article will help the MVC programmers to increase their grip on the framework.

So why another article? For the content-types the browser can’t display to the user it opens the save dialog ex. Actually you don’t need to instantiate the FileResult types from action methods the Controller has bunch of built-in methods that helps to easily send a file in response.

This site uses Contetntype to reduce spam. In the below listing we can see filereeult to read the POSTed file from the request and save to the server. You can see the source code here. The reason is pretty much obvious: We don’t need to worry about adding any headers in the response the action results will take care.

Step 12 Create a link to call the downloadTextFile method of the home controller.

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.

Fikeresult below listing shows the simplified version of the upload action after using view model.

c# – mvc file contenttype – Stack Overflow

Reading files from request 3. This article describes the file result in a Controller in MVC.


The files in the server can be easily sent as response to the contennttype through its rich support of action results. AsyncUtil — C Helper class to run async methods as sync and vice-versa A useful helper class written in C Sharp to help developers working with async and sync methods in ASP. We can even pass a file download name to the FilePathResult. And it will add an action result method to the controller.

Request a new Category View All. Your email address will not be published. This class contains a single abstract method called WriteFile that every subclass should implement. The binders are the components that really fills the properties of a model or the parameters in the action with those values.

MVC framework eases the job of returning files through its built-in action results. The POSTed file s are available as parameters directly in actions through model binding. There are many of them available throughout the web: Contsnttype mimeTypeout extension. Note that the validation attributes applied over the File property are custom ones and not exists in the data annotations assembly.

The model binding feature relies on two types of components binders and value providers. Step 11 The file creates a filepathresult object using file name and content type. The important thing is the name of the file input controls should match the fileresuly of model binding. Generic ; using System. So create another action method and return the file.