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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 Content-Type header is the one that says the browser what kind of file is being returned from the server. 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 contentype used in this case. How a browser knows what file type is returned from the server? Step 3 Name the controller as in the following: GetAssembly typeof HttpApplication.

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.

Uploading multiple files 5.

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

November 10, November 10, Step 6 Add a title to the index page. The files in the server can be easily sent as response to the clients through its rich support of action results.

In this article we learnt many things about uploading and returning files in an MVC application. How to upload a file? This class contains a single abstract method called WriteFile that every subclass should implement. I’m sure this article will help the MVC programmers to increase fileresuot grip on the framework.


Uploading and returning files in MVC

We can even pass a file download name to the FilePathResult. Request a new Category View All. How to return a file as response? Instead of manually reading the file from the Requestby taking the advantage of model binding the file can be made directly available as a parameter in the action contetntype shown in the below listing. 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.

In the coming sections we will see how we can easily return a file as response to the clients. Right-click on “Index” and select “Add View Uploading and returning filresult in an ASP. 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.

So contentthpe we have seen how to upload files to server and validate them using data annotations. Step 11 The file creates a filepathresult object using file name and content type. This site uses Akismet to reduce spam. For the content-types the browser can’t display to the user it opens the save dialog ex. The below listing shows the simplified version of the upload action after using view model. How about reading multiple files POSTed to the fileresul Notify me of new posts by email.

You may think why no value providers are used in this case, it’s because the source is single and clear i. The important thing to note down is the file parameter name should be same as the name of the file input control in the above case it is photo. However, there is a major caveat: Reading files from request 3. The Fileresukt framework is designed in fikeresult a way that these two components are contentttype 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.


Since it’s also a lead designer for many App and games for Android, iOS and Windows Phone mobile devices for a number of italian companies. If you’re working with ASP. Thanks for all the readers who pointed out the errors and typos in the article.

Creating custom validation attribute is not a difficult job! But what we are interested here is to know the supporting classes.

There filwresult many of them available throughout the web: Step 4 Now we need to create a view. The value providers are the components that gets the value needed from the particular source query-strings, form etc.

File action-results class diagram. The model binding feature relies on two types of components binders and value providers. The reason is pretty much obvious: