public ContentEntry GetEntryFor( long key, string subKey )
Each ContentEntry in the documentation provides a Key and SubKey, the Key is a unique identifier for a type while the SubKey helps to differentiate between groups of content for that type; such as the List of members.
So to retrieve the complete list of methods for a types you may do the following.
Documentation docs = new Documentation("mysolution.sln"); TableOfContents tocs = docs.GetTableOfContents(); ContentEntry method = tocs.GetEntryFor(123456, "Methods");
The SubKey is not required so passing null or an empty string to that parameter will get the type or member which the unique key related to.