How to get the content/type of a file at runtime

c# asp.net-mvc asp.net-mvc-2 content-type
Lorenzo picture Lorenzo · Jan 2, 2011 · Viewed 74.6k times · Source

I am trying to determine dynamically the content/type of a input file. If I would be in a windows application I could write code like this (from this blog)

private string GetContentType(string fileName) {
    string contentType = "application/octetstream";
    string ext = System.IO.Path.GetExtension(fileName).ToLower();
    Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
    if (registryKey != null && registryKey.GetValue("Content Type") != null)
        contentType = registryKey.GetValue("Content Type").ToString();
    return contentType;
}

What other methods are more suitable for an MVC application?

I would like to use the param within the Controller.File(...) method that receive a filepath and a contentype.

Answer

masterwok picture masterwok · Apr 29, 2014

In .Net 4.5 you can use MimeMapping.GetMimeMapping:

string contentType = MimeMapping.GetMimeMapping("someFileName.pdf")
// contentType = "application/pdf"

More information

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