ASP.NET/IIS6: How to search the server's mime map?
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_ROOTMIMEDatabaseContent 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.
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, ie .flv .
Here is another similar implementation, but doesn't require adding the COM reference - it retrieves the properties through reflection instead and stores them in a NameValueCollection for easy lookup:
using System.Collections.Specialized; //NameValueCollection
using System.DirectoryServices; //DirectoryEntry, PropertyValueCollection
using System.Reflection; //BindingFlags
NameValueCollection map = new NameValueCollection();
using (DirectoryEntry entry = new DirectoryEntry("IIS://localhost/MimeMap"))
{
PropertyValueCollection properties = entry.Properties["MimeMap"];
Type t = properties[0].GetType();
foreach (object property in properties)
{
BindingFlags f = BindingFlags.GetProperty;
string ext = t.InvokeMember("Extension", f, null, property, null) as String;
string mime = t.InvokeMember("MimeType", f, null, property, null) as String;
map.Add(ext, mime);
}
}
You can very easily cache that lookup table, and then reference it later:
Response.ContentType = map[ext] ?? "binary/octet-stream";
IIS stores the MIME information in its own database. Searching for "MimeMap IIS" on the internet will reveal how to read it or even change it. See for example C# - How to display MimeMap entries to the console from an instance of IIS.
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