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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How do I determine a file’s content type in. StriplingWarrior, yep, you’ve got a point on this, the compiler is able to do some white magic with the final code. The compiler is smart enough to implement a switch statement using a dictionary, or some other structure depending on how it thinks it will get better performance.
The MVC framework is designed in such a way that these two components are loosely coupled and hence a binder don’t need to worry about which value provider it has to interact to get the value for a property or parameter likewise a value provider don’t need to worry about who is asking the value. The FileStreamResult reads chunks of data from the stream and write into the response. The below code snippet shows how we can return a file just plain from an action without using action results.
How do I know the correct content type of my file?
This isn’t reliable enough for anything that’s going to go through pen testing. Aggiungi e-mail alla newsletter.
You probably ought to use a switch statement rather than building a new dictionary every time you call ContentType. Email Required, but never shown. 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.
Learn how your comment data filestreamreeult processed.
Uploading and returning files in MVC
It looks like you still have the filename when you go to set the content type. You might, of course, want to keep the mimeTypes alive for future queries. For example, let see how we can create a custom action result that return files from string, let’s call it FileStringResult.
We discussed about the different types of contentttpe 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. To understand how it generates the header see the source code. Generic ; using System. Leave a Reply Cancel reply Your email address will not be published.
contenttype Actually you don’t need to instantiate the FileResult types from action methods the Controller has bunch of built-in methods that helps to easily send a file in response. Thanks for all the readers who pointed out the errors and typos in the article.
MVC framework eases the job of returning files through its built-in action results. We can easily create new file action results by deriving from the the fikestreamresult class FileResult. Reading files from request 3. The files in the server can be easily sent as response to the clients through its rich support of action results. How to return a file as response?
Get a File Content-Type / MIME-type from file extension in ASP.NET C#
contenytype The Content-Type header is the one that says the browser what kind of file is being returned from the server. This should be the answer. You can see the complete code of FileContentResult here.
OpenSubKey ext ; if regKey! GetExtension and map that to one of the types listed in Extensions. Show “Cannot read file from disk.
content-type – Как определить тип содержимого файла в .NET? – Qaru
There are many of them available throughout the web: Assuming the filestreamresutl downloading it will be using a web browser, try to stick to the common ones: How to Deploy a ASP. I made a C helper class based on Zacks response. 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.
For the content-types the browser can’t display to the user it opens the save dialog ex. If it fails then generate the header value based on RFC from its own methods. There are already plenty of articles written on this subject.