public static GraphTraversal <Vertex, IDictionary <string, T> > SelectBy <T>(this GraphTraversal <Vertex, Vertex> t, string[] selectKey)
{
var trav = new GraphTraversal <Vertex, IDictionary <string, T> >();
var aliases = new List <string>();
var properties = new List <string>();
foreach (var key in selectKey)
{
var arrStr = key.Split(".");
if (string.IsNullOrEmpty(key) || arrStr.Length % 2 != 0)
{
throw new ArgumentException("The selectKey must be non-null and in the format <alias name>.<property name>");
}
aliases.Add(arrStr[0]);
properties.Add(arrStr[1]);
}
if (aliases.Count == 2)
{
trav = t.Select <T>(aliases[0], aliases[1]);
}
else if (aliases.Count > 2)
{
trav = t.Select <T>(aliases[0], aliases[1], aliases.GetRange(2, aliases.Count - 2).ToArray());
}
foreach (var prop in properties)
{
trav = trav.By(prop);
}
return(trav);
}