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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Using view models to validate POSTed files 5. For some content types the browser doesn’t open the save dialog and display the content directly inside its window. How to return a file as response? Step 3 Name the controller as in the following:. Note that the validation attributes applied over the File property are custom ones and not exists in the data annotations assembly.

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

This article describes the file result in a Controller in MVC. Uploading multiple files 5.

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. Aggiungi e-mail alla newsletter. Step 4 Now we need to create a view.

Your email address will not be published. The value providers are the components fileresklt gets the value needed from the particular source query-strings, form etc. The below listing shows the simplified version of the upload action after using view model.

This class contains a single abstract method called WriteFile that every subclass should implement. 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.

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


File Result in Controller Sample in MVC: Day 15

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. Thanks for all the readers who pointed out the errors and typos in the article. When you have a single instance of HttpPostedFileBase as an action fileredult 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 Content-Type header is the one that says the browser what kind of file is being returned from the server. So far we have seen how to upload files to foleresult and validate them using data annotations. This is undoubtely a major issue that might leads some to prefer the following method instead. OpenSubKey ext ; if regKey! In the below listing we can see how to read the POSTed file from the request and save to the server. How to upload a file? To understand how it filfresult the header see the source code.

You can see the source code here. Uploading and returning files in an ASP. Leave a Reply Cancel reply Your email address will not be published.

Step 11 The file creates a filepathresult object using file name and content type. You may think why no value providers are used in this case, it’s because the source is single and clear i. Request a new Category View All. So why another article?

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

Behind the scenes 3. There are many of them available throughout the web: TryGetValue extension, out mime? There are three built-in contemttype that implements FileResult: Notify me of follow-up comments by email.


Notify me of new posts by email. The ContentDispositionUtil tries first to get the header value using the ContentDisposition class which is located in the System. I’m sure this article will help the MVC programmers to increase their grip on the framework.

Step 13 Run the project, click on “Return File” and the text file will be opened in the browser. Web namespace — System. I used to have mine too, until I found this great GitHub project that covers a gigantic amount of them: Visual Studio New Features. We can easily create new file action results by deriving from the the abstract class FileResult. And it will add an action result method to the controller. Step 9 Create a link to call the downloadfile method of the home controller.

Step 3 Name the controller as in the following: 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. The main benefit of this technique is the simplicity: Step 8 Filepathresult initializes a new instance of contejttype filepathresult class by using the specified file name rileresult content type. 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.

The below code snippet shows how we can return a file just plain from an action without using action results. We can use our FileStringResult as shown in the below action.

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