This method is part of the Foundation.NSCoding protocol and is used by applications to preserve the state of the object into an archive.

Users will typically create a Foundation.NSKeyedArchived and then invoke the Foundation.NSKeyedArchived.ArchiveRootObjectToFile which will call into this method

If you want to allow your object to be archived, you should override this method and store your state in using the provided encoder parameter. In addition, you should also implement a constructor that takes an NSCoder argument and is exported with [Export ("initWithCoder:")]

public void override EncodeTo (NSCoder coder){
    c.Encode (1, key: "version");
    c.Encode (userName, key: "userName");
    c.Encode (hostName, key: "hostName");

This can be used from a background thread.