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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Get a File Content-Type / MIME-type from file extension in ASP.NET C#
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. Email Required, but never shown. Controller helper methods to return files 9.
Add a string resource to you project that contains the list. Your email address will not be published. Will k 45 So why another article? You can see the source code here.
We saw how we can apply validations to the POSTed files easily using view models.
Как определить тип содержимого файла в .NET?
We can use our FileStringResult as shown in the below action. Web namespace — System.
To understand how it generates the header see the source code. The important thing is the name of the file input controls should match the rules of model binding.
Example, when you return a pdf file, some browsers knows how to display the pdf files inside it, same for images.
FileStreamResult(Stream, String) Constructor () | Microsoft Docs
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 filestreamresylt response. GetAssembly typeof HttpApplication. How is the Display function used inside the page? Returning files through action results 7.
For the content-types the browser can’t display to the user it opens the save dialog ex. This isn’t reliable enough for anything that’s going to go through pen testing. If it fails then generate the header value based on RFC from its own methods. 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. POSTing a file to the server is quite simple.
FileStreamResult , FilePathResult File for action MVC not working for image | The Forums
End Sub I determine the content type with this function: The value providers are the components that gets the value needed from the particular contnettype query-strings, form etc. 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. StriplingWarrior, or keep a single static dictionary. You can see the complete code of FileContentResult here. Note that the validation attributes applied over the Contenttpe property are custom ones and not exists in the data annotations assembly.
There is no page. For some content types the browser doesn’t open the save dialog and display the content directly inside its window.
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 filestreamresul need to worry about who is asking the value.
Leave a Reply Cancel reply Your email address will not be published. Uploading multiple files 5. Behind the scenes 3.