A small class to retrieve the MIME Type of any file and/or extension in C# using Windows Registry or a static MIME Type Map for I have even tried FilePathResult and FileStreamResult nothing works public FileResult “must-revalidate”); return File(path, contentType); }. Я заменил столбец FileExtension в моей таблице базы данных столбцом ContentType. Я заполняю его, когда я загружаю файл. Private Sub.

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Assuming the person downloading it will be using a web browser, try fi,estreamresult stick to the common ones: You can see the complete code of FilePathResult here. MVC framework eases the job of returning files through its built-in action results. This is an abstract class derived from ActionResult that delegates writing the file in the response to the subclasses.

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How do I determine a file’s content type in .NET? – Stack Overflow

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. Leave a Reply Cancel reply Your email address will not be published. My WPF application gets a file from the user with Microsoft.

But what we are interested here is to know the supporting classes. Learn how your comment data is processed. This class mainly does the job of adding Content-Type and Content-Disposition headers into the response. StriplingWarrior, yep, you’ve got a point on this, the compiler is able to do cntenttype white magic with the final code.


Как определить тип содержимого файла в .NET?

NET simply maps to the extension given in the filename string. We saw how we can apply validations to the POSTed files easily using view models. There are already plenty of articles written on this subject. I made a C helper class based on Zacks response.

So far we have seen how to upload files to server and validate them using data annotations. In the coming sections we will see how we can easily return a file as response to the clients. Email Required, but never shown.

Behind the scenes 3. 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.

Dim regKey As Microsoft. We can easily create new file action results by deriving from the the abstract class FileResult. For example, let see how we can create a custom action result that return files from string, let’s call it FileStringResult.

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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. It looks like you still have the filename when you go to set the content type. Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes.


Aggiungi e-mail alla newsletter. I populate it when I upload a file. Like any other input data the POSTed files to the server also needs validation. The FileStreamResult reads chunks of data from the stream and write into the response.

We don’t need to worry about adding any headers in the response the action results will take care. OpenSubKey ext ; if regKey! When we use the HttpPostedFileBase directly as action parameter then we have to validate the file manually as shown in the below listing. Reading files from request 3. I really appreciate them. If fileatreamresult working with ASP. How a browser knows what file type is returned from the server?

The files in the server can be filestreqmresult sent as response to the clients through its rich support of action results. You can see the source code here. To understand how it generates the header see the source code. GetAssembly typeof HttpApplication. Will k 45 There is no page. The model binding feature relies on two types of components binders and value providers.

Well, in this article I gathered the important concepts that contenttypee scattered in different posts, threads in a single place.