static void Main(string[] args) {
var d1 = new DirTree(@"C:\",
new DirTree(@"C:\Dir1",
new DirTree(@"C:\Dir1\Dir2"),
new DirTree(@"C:\Dir1\Dir3")
),
new DirTree(@"C:\Dir4",
new DirTree(@"C:\Dir4\Dir5"),
new DirTree(@"C:\Dir4\Dir6")
));
var path = @"D:\Dirs.dir";
// write the directory tree to a file
var file = new FileStream(path, FileMode.CreateNew | FileMode.Truncate);
var w = new BinaryWriter(file);
d1.WriteTo(w);
w.Close();
file.Close();
// read it from the file
var file2 = new FileStream(path, FileMode.Open);
var rdr = new BinaryReader(file2);
var d2 = new DirTree(rdr);
// now inspect d2 in debugger to see that it was read back into memory
// find files bigger than (roughly) 1GB
var BigFiles = from f in f_results.FromFile(@"C:\SomeFile.dat")
where f.size > 1e9
select f;
}