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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For example, in the case of image we need the file should be one of the supported image types like jpg, jpeg, png by the server and we may also need validations to check the file size, file name etc. 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.

November 10, November 10, Step 8 Filepathresult initializes a new instance of the filepathresult class by using the specified file name and content type. This class contains a single abstract method called WriteFile that every subclass should implement.

contdnttype We saw how we can apply validations to the POSTed files easily using view models. Uploading multiple files 5. Click on the “Add” button.

Using view models to validate POSTed files 5. How to Deploy a ASP.

Uploading and returning files in an ASP. 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.


c# – mvc file contenttype – Stack Overflow

However, there is a major caveat: In the below listing we can see how to read the POSTed file from the request and save to the server. The Content-Type header is the one that says the browser what kind of file is being returned fileeresult the server. The binders are the components that really fills the properties of a model or the parameters in the action with those values.

In this article we learnt many things about uploading and returning files in an MVC application. Step 5 Name the view and select “Empty without model ” as the template. You may think why no value providers are used in this case, it’s because the source is single and clear i.

The FileStreamResult reads chunks of data from the stream and write into the response.

The ContentDispositionUtil tries first to get the header value using the ContentDisposition class which is located in the System. Learn how your comment data is processed. POSTing a file to the server is quite simple. How a browser knows what file type is returned from the server?

The size of each chunk is 4KB and this can’t be changed through code or config. This is undoubtely a major issue that might leads some to prefer the following method instead.

In the above action we have done couple of validations against the uploaded file. 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.


TryGetValue mimeTypeout extension. This site uses Akismet to reduce spam. We can easily create new file action results by deriving from the the abstract class FileResult.

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.

Well, in this article I gathered contenttypf important concepts that are scattered in different posts, threads in a single place. Step 11 The file creates a filepathresult object using file name and content type. Visual Studio New Features. Step 3 Name the controller as in the following: For the content-types the browser can’t display to the user it opens the save dialog ex. You can see the complete code of FilePathResult here.

And filefesult will add an action result method to the controller. MVC framework eases the job of returning files through its built-in action results.

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

Step 9 Create a link to call the downloadfile method of filerexult home controller. 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. Web namespace — System.