Asp.net http download file

TransmitFile Server. End ; The first step is to set the content type. In the example above, we're downloading a. Here are some of the most common content types:. TransmitFile retrieves a file and writes it to the Response. In some cases, we can't call TransmitFile because we can't map a path to the file.

Instead, we'll get the file as a Stream and write it to the Response object: Response. Open, FileAccess. Read buffer, 0, bufferLength ; Response. GetFiles Server. ReadAllBytes path ;. Inside the View, the FileModel class is declared as List which specifies that it will be available as a Collection. Displaying the Files. Downloading the File. Related Articles. Add Comments. Thank you for the feedback. The comment is now awaiting moderation.

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Please do not post code, scripts or snippets. Required Invalid Email Address. This is really simple. After establishing whether the current user is authenticated, the handler checks the querystring for a filename. At that point it is important to validate the filename, to make sure that it is one that the user can have access to.

This will throw an exception on most servers, as the.. However, as a couple of commentators have mentioned below, this is not always the case.

Then the method simply uses Response. WriteFile to deliver the file. You may prefer to check the file extension and set the ContentType accordingly. You may also want to add some error checking logic to ensure that a querystring value has been passed, that the file exists etc.

However, if you are not using FormsAuthentication out of the box, you may be checking a session variable on each page to see if the user is logged in instead. This being the case, you need to know that HttpHandlers do not have access to session state by default, so references to session variables will fail. The HttpContext object that is passed in to the ProcessRequest method provides access to session variables through its Session property.

That just leaves one question - how does the file name get into the querystring? There we have it Simple authentication checks made before delivering files, without having to register the handler in the web. If you are being hosted on a server that runs IIS 7. With its new Integrated Pipeline model, a simple change to your application's web.