static void Main(string[] args)
{
var ctx = new WorldContext();
ctx.Database.EnsureCreated();
// Reset example
ctx.Database.ExecuteSqlCommand("delete from Border");
ctx.Database.ExecuteSqlCommand("delete from country");
// Create countries
var de = new Country();
de.Name = "Germany";
ctx.Countries.Add(de);
ctx.SaveChanges();
var nl = new Country();
nl.Name = "Netherlands";
ctx.Countries.Add(nl);
nl.AddBorderToCounty(de);
ctx.SaveChanges();
var dk = new Country();
dk.Name = "Denmark";
ctx.Countries.Add(dk);
dk.AddBorderToCounty(de);
ctx.SaveChanges();
var be = new Country();
be.Name = "Belgium";
ctx.Countries.Add(be);
be.AddBorderToCounty(de);
be.AddBorderToCounty(nl);
ctx.SaveChanges();
var fr = new Country();
fr.Name = "France";
ctx.Countries.Add(fr);
fr.AddBorderToCounty(de);
ctx.SaveChanges();
var cz = new Country();
cz.Name = "Czech Republic";
ctx.Countries.Add(cz);
cz.AddBorderToCounty(de);
ctx.SaveChanges();
var lu = new Country();
lu.Name = "Luxembourg";
ctx.Countries.Add(lu);
lu.AddBorderToCounty(de);
lu.AddBorderToCounty(fr);
lu.AddBorderToCounty(be);
ctx.SaveChanges();
var pl = new Country();
pl.Name = "Poland";
ctx.Countries.Add(pl);
pl.AddBorderToCounty(de);
pl.AddBorderToCounty(cz);
ctx.SaveChanges();
var at = new Country();
at.Name = "Austria";
ctx.Countries.Add(at);
at.AddBorderToCounty(de);
at.AddBorderToCounty(cz);
ctx.SaveChanges();
var ch = new Country();
ch.Name = "Switzerland";
ctx.Countries.Add(ch);
ch.AddBorderToCounty(de);
ch.AddBorderToCounty(fr);
ch.AddBorderToCounty(at);
ctx.SaveChanges();
Console.WriteLine("All countries with their borders");
foreach (var country in ctx.Countries)
{
Console.WriteLine("--------- " + country.Name);
// now explicitly load the neighboring countries, as Lazy Loading in EFC does not work
//var borders1 = ctx.Countries.Where(x => x.IncomingBorders.Any(y => y.Country_Id == country.Id)).ToList();
//var borders2 = ctx.Countries.Where(x => x.OutgoingBorders.Any(y => y.Country_Id1 == country.Id)).ToList();
//var allborders = borders1.Union(borders2).OrderBy(x=>x.Name);;
// better: encapsulated in the context class:
var allborders = ctx.GetNeigbours(country.Id);
foreach (var neighbour in allborders)
{
Console.WriteLine(neighbour.Name);
}
}
Console.WriteLine("=== DONE!");
Console.ReadLine();
}
