Many posts in internet says that HttpPostedFileBase is a read only and we cannot change the content type. Can anybody let me know how we. Just make sure you derive your custom attribute class from the ValidationAttribute base class and apply it to HttpPostedFileBase properties in. The HttpPostedFileBase is created to substitute HttpPostedFile in MVC .. For example, to return a pdf file from the server the Content-Type.

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Как получить содержимое/тип файла во время выполнения

You can see the complete code of FileContentResult here. The type of the file matches the file extension? How to return a file as response?

Lets create a view model that wraps HttpPostedFileBase as a property which is decorated with data annotation attributes. If your app httppodtedfilebase uploading different files on different pages, you can create an enum for the different file types and pass that enum to the constructor of the AttachmentAttribute.

How to change the content type of httppostedfilebase? – CodeProject

This class mainly does the job of adding Content-Type and Content-Disposition headers into the response. Solved concerna javascript snippet to check extension, and then do some editing to disable button like: Treat my content as plain text, not as HTML.

Or you can check it on client side thru html attribute ‘accept’ to filter the file asap: The FileStreamResult reads chunks of data from the stream and write into the response. What else do you usually check when you validate the uploaded files? MVC framework eases the job of returning files through its built-in action results. You are commenting using your Twitter account.


The important thing is the name of the file input controls should match the rules of model binding. Provide an answer or move on to the next question. In the below listing we can see how to read the Contentytpe file from the request and save to the contenytype. 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. Chances are they have and don’t get it.

The binders are the components that really fills the properties of a model or the parameters in the action with those values. Existing Members Sign in to your account. Ajax file upload Codes from the field This is awesome!! 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 httpostedfilebase we may also need validations to check the file size, file name etc.

Read the question carefully. One of the beauties of ASP. Sometimes you also have to check: Thanks for all the readers who pointed out the errors xontenttype typos in the article.


Using view models to validate POSTed files 5. This email is in use.

ContentType – .NET API Catalog

For some content types the browser doesn’t open the save dialog and display the content directly inside its window. So far we have seen how to upload files to server and validate them using data annotations.

This is a working solution: The size of each htppostedfilebase is 4KB and this can’t be changed through code or config. Beware, user can still change filetye to “All files”, with this in mind, better check this:. Creating custom file action result You are commenting using your Facebook account. You can see the source code here. We can use our Cojtenttype as shown in the below action. Returning files through action results 7.

Do you need your password? You could check the file name and extension and MIME type but that might not be reliable because conrenttype user could simply rename the file before uploading.

Never mind got it working. The ContentDispositionUtil tries first to get the header value using the ContentDisposition class which is located in the System.