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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TryGetValue extensionout mime? Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes.
Get a File Content-Type / MIME-type from file extension in ASP.NET C#
TryGetValue extension, out mime? In the above action we have done couple of validations against the uploaded file. 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. 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. Aggiungi e-mail alla newsletter.
Example, when you return a pdf file, some browsers knows how to display the pdf files inside it, same for images. Uploading multiple files 5. This is an abstract class derived from ActionResult that delegates writing the file in the response to the subclasses.
Как определить тип содержимого файла в .NET?
TryGetValue mimeTypeout extension. Behind the scenes 3. We can easily create new file action results by deriving from the the abstract class FileResult. How a browser knows what file type is returned from the server? There is no page. 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.
A dictionary may be a good idea, especially if you want the list of supported extensions to be dynamic, or have it loaded in from a config file or something. Notify me of follow-up comments by email. Thanks for all the readers who pointed out the errors and typos in the article.
This is just a starting point. GetExtension method so you don’t have to split the file name manually. Controller helper methods to return files contentyype. Item FileExtension3 Else Debug.
FileStreamResult(Stream, String) Constructor () | Microsoft Docs
This isn’t reliable enough for anything that’s going to go through pen testing. Add a string resource to you project that contains the list. GetExtension and map that to one of the types listed in Extensions.
This site uses Akismet to reduce spam. I made a C helper class based on Zacks response.
How to upload a file? 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.
Get a File Content-Type / MIME-type from file extension in C#
Dim regKey As Microsoft. You can use This list, that contains file extensions. 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.
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.
The Content-Type header is the one that says the browser what kind of file is being returned from the server. Reading files from request 3.
End Sub I determine the content type with this function: Well, in this article I gathered the important concepts that are scattered in different posts, threads in a single place. The main benefit of this technique is the simplicity: You can see the source code here.
File action-results class diagram.