ASP.NET/IIS6: How to search the server's mime map?

Question

i want to find the mime-type for a given file extension on an IIS ASP.NET web-server from the code-behind file.

i want to search the same list that the server itself uses when serving up a file. This means that any mime types a web-server administrator has added to the Mime Map will be included.

i could blindly use

HKEY_CLASSES_ROOT\MIME\Database\Content Type

but that isn't documented as being the same list IIS uses, nor is it documented where the Mime Map is stored.

i could blindly call FindMimeFromData, but that isn't documented as being the same list IIS uses, nor can i guarantee that the IIS Mime Map will also be returned from that call.

Answer 1

Here's one I made earlier:

public static string GetMimeTypeFromExtension(string extension)
{
    using (DirectoryEntry mimeMap = 
           new DirectoryEntry("IIS://Localhost/MimeMap"))
    {
        PropertyValueCollection propValues = mimeMap.Properties["MimeMap"];

        foreach (object value in propValues)
        {
            IISOle.IISMimeType mimeType = (IISOle.IISMimeType)value;

            if (extension == mimeType.Extension)
            {
                return mimeType.MimeType;
            }
        }

        return null;

    }
}

Add a reference to System.DirectoryServices and a reference to Active DS IIS Namespace Provider under the COM tab. The extension needs to have the leading dot, i.e. .flv.