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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Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes.

Uploading multiple files 5. 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 reason is pretty much obvious: In the above action we have done couple of validations against the uploaded file.

We saw how we can apply validations to the POSTed files easily using view models. You can see the complete code of FilePathResult here. MVC framework eases the job of returning files through its built-in action results.

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Behind the scenes 3. I’m sure this article will help the MVC programmers to increase their grip on the framework.

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. When we use the HttpPostedFileBase directly as action parameter then we have to validate the file manually as shown in the below listing. There filereuslt three built-in classes that implements FileResult: Reading files from request fileresultt. The FileStreamResult reads chunks of data from the stream and write into the response.

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

How about reading multiple files POSTed to the server? POSTing a file to the server is quite simple. Generic ; using System.

Creating custom validation attribute is not a difficult job! 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 cnotenttype in ASP.

This article describes the file result in a Controller in MVC.

Uploading and returning files in MVC

TryGetValue extension, out mime? 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.


This site uses Akismet to reduce spam. TryGetValue mimeTypeout extension. The below code snippet shows how we can return a file just plain from an action without using action results. The below listing shows the simplified version of the upload action after using view model.

Notify me of new posts by email. Returning files through action results 7. November 10, November 10, Notify me of follow-up comments by email. The binders are the components that really fills the properties of a model or the parameters in the action with those values.

To understand how it generates the header see the source code. But what we are interested here is to know the supporting classes. I really appreciate them.