How to get more information from a InputStremed file?

If I'm using the InputStream to receive a file, like

HttpContext.Current.Request.InputStream

How can get more information about the file?

I can easily convert a Stream into a phisical File, but for example, how would I know the file extension in use?

string fileIn = @"C:\Temp\inputStreamedFile.xxx"; // What extension?

using (FileStream fs = System.IO.File.Create(fileIn))
{
    Stream f = HttpContext.Current.Request.InputStream;
    byte[] bytes = new byte[f.Length];
    f.Read(bytes, 0, (int)f.Length);
    fs.Write(bytes, 0, bytes.Length);
}

The idea behind this is because using HttpPostedFileBase I always get null:

public ContentResult Send(HttpPostedFileBase fileToUpload, string email)
{
    // Get file stream and save it

    // Get File in stream
    string fileIn = Path.Combine(uploadsPath, uniqueIdentifier),
           fileOut = Path.Combine(convertedPath, uniqueIdentifier + ".pdf");

    // Verify that the us开发者_Python百科er selected a file
    if (fileToUpload != null && fileToUpload.ContentLength > 0)
    {
        // extract only the fielname
        string fileExtension = Path.GetExtension(fileToUpload.FileName);
        fileIn = String.Concat(fileIn, fileExtension);

        fileToUpload.SaveAs(fileIn);
    }

    // TODO: Add Convert File to Batch

    return Content("File queued for process with id: " + uniqueIdentifier);
}

and this is what I'm sending from the command line:

$ curl --form email='mail@domain.com' --form fileToUpload='C:\temp\MyWord.docx' http://localhost:64705/send/
File queued for process with id: 1d777cc7-7c08-460c-8412-ddab72408123

the variable email is filled up correctly, but fileToUpload is always null.

P.S. This does not happen if I use a form to upload the same data.

I'm sorry if this doesn't help, but why use InputStream to get uploaded file(s) ?

This is what I usually do:

[HttpPost]
public ActionResult Upload(HttpPostedFileBase[] files) {
    String physicalPath = "c:\\whatever";
    foreach (var file in files) {
        String extension = Path.GetExtension(file.FileName);
        file.SaveAs(physicalPath + "\\" + file.FileName);
    }
    return View();
}

The only problem I found was using curl... I was forgetting the @ sign that mention that the uploaded form would be encoded as multipart/form-data.

The correct curl command to use HttpPostedFileBase would be:

$ curl --form email='mail@domain.com' 
       --form fileToUpload=@'C:\temp\MyWord.docx' 
       http://localhost:64705/send/

You can get the info about posted file from <input type="file" />. But actually it's used a bit different way to upload files in asp.net mvc check out here