private static Manufacturer CreateManufacturerIfNotExists(PhotographyContext context, XElement xManufacturer)
{
Manufacturer manufacturer = null;
var xElementManufacturerName = xManufacturer.Element("manufacturer-name");
if (xElementManufacturerName != null)
{
var manufacturerName = xElementManufacturerName.Value;
manufacturer = context.Manufacturers.FirstOrDefault(x => x.Name == manufacturerName);
if (manufacturer != null)
{
Console.WriteLine("Existing manufacturer: {0}", manufacturerName);
}
else
{
manufacturer = new Manufacturer
{
Name = manufacturerName,
};
context.Manufacturers.Add(manufacturer);
context.SaveChanges();
Console.WriteLine("Created manufacturer: {0}", manufacturerName);
}
}
return manufacturer;
}
private static void CreateLensesIfNotExist(PhotographyContext context, IEnumerable<XElement> xLenses, Manufacturer manufacturer)
{
foreach (var xLens in xLenses)
{
var lensModel = xLens.Attribute("model").Value;
var lensType = xLens.Attribute("type").Value;
var lensPrice = xLens.Attribute("price");
var lens = context.Lenses.FirstOrDefault(x => x.Model == lensModel);
if (lens != null)
{
Console.WriteLine("Existing lens: {0}", lensModel);
}
else
{
lens = new Lens
{
Model = lensModel,
Type = lensType,
Price = lensPrice != null ? decimal.Parse(lensPrice.Value) : default(decimal?),
ManufacturerId = manufacturer.Id
};
context.Lenses.Add(lens);
context.SaveChanges();
Console.WriteLine("Created lens: {0}", lensModel);
}
}
}
static void Main()
{
var context = new PhotographyContext();
var cameras = context.Cameras
.Select(x => x.Manufacturer.Name + " " + x.Model)
.OrderBy(x => x);
Console.WriteLine(string.Join("\n", cameras));
}
static void Main()
{
var context = new PhotographyContext();
var photographs = context.Photographs
.OrderBy(x => x.Title)
.Select(x => new
{
x.Title,
x.Link,
Category = x.Category.Name,
Equipment = new
{
Camera = new
{
Name = x.Equipment.Camera.Manufacturer.Name + " " + x.Equipment.Camera.Model,
x.Equipment.Camera.Megapixels
},
Lens = new
{
Name = x.Equipment.Lens.Manufacturer.Name + " " + x.Equipment.Lens.Model,
x.Equipment.Lens.Price
}
},
});
var resultXml = new XElement("photographs");
foreach (var photograph in photographs)
{
var photographXml = new XElement("photograph");
photographXml.Add(new XAttribute("title", photograph.Title));
photographXml.Add(new XElement("category", photograph.Category));
photographXml.Add(new XElement("link", photograph.Link));
var equipmentXml = new XElement("equipment");
equipmentXml.Add(new XElement("camera", photograph.Equipment.Camera.Name, new XAttribute("megapixels", photograph.Equipment.Camera.Megapixels)));
if (photograph.Equipment.Lens.Price.HasValue)
{
equipmentXml.Add(new XElement("lens", photograph.Equipment.Lens.Name, new XAttribute("price", string.Format("{0:f2}", photograph.Equipment.Lens.Price))));
}
else
{
equipmentXml.Add(new XElement("lens", photograph.Equipment.Lens.Name));
}
photographXml.Add(equipmentXml);
resultXml.Add(photographXml);
}
var resultXmlDoc = new XDocument();
resultXmlDoc.Add(resultXml);
resultXmlDoc.Save("photographs.xml");
Console.WriteLine("Photographs exported to photographs.xml");
}
static void Main()
{
var inputXml = XDocument.Load("../../manufacturers-and-lenses.xml");
var xManufacturers = inputXml.XPathSelectElements("/manufacturers-and-lenses/manufacturer");
var context = new PhotographyContext();
var manufacturersCount = 0;
foreach (var xManufacturer in xManufacturers)
{
Console.WriteLine("Processing manufacturer #{0} ...", ++manufacturersCount);
Manufacturer manufacturer = CreateManufacturerIfNotExists(context, xManufacturer);
var xLenses = xManufacturer.XPathSelectElements("lenses/lens");
CreateLensesIfNotExist(context, xLenses, manufacturer);
Console.WriteLine();
}
}
static void Main()
{
var context = new PhotographyContext();
var manufacturersWithTeams = context.Manufacturers
.OrderBy(x => x.Name)
.Select(x => new
{
manufacturer = x.Name,
cameras = x.Cameras
.OrderBy(c => c.Model)
.Select(c => new
{
model = c.Model,
price = c.Price
})
});
var jsSerializer = new JavaScriptSerializer();
var json = jsSerializer.Serialize(manufacturersWithTeams);
File.WriteAllText("manufacturers-and-cameras.json", json);
Console.WriteLine("File manufacturers-and-cameras.json exported.");
}
private static void ProcessRequest(EquipmentRequest request)
{
var context = new PhotographyContext();
var manufacturer = context.Manufacturers.FirstOrDefault(x => x.Name == request.Manufacturer);
var cameraIds = context.Cameras
.Where(x => x.ManufacturerId == manufacturer.Id)
.Select(x => x.Id)
.ToList();
var lensIds = context.Lenses
.Where(x => x.ManufacturerId == manufacturer.Id)
.Select(x => x.Id)
.ToList();
var rnd = new Random();
for (int i = 0; i < request.GenerateCount; i++)
{
var equipment = new Equipment();
var lensRand = rnd.Next(lensIds.Count);
var cameraRand = rnd.Next(cameraIds.Count);
equipment.LensId = lensIds[lensRand];
equipment.CameraId = cameraIds[cameraRand];
context.Equipments.Add(equipment);
context.SaveChanges();
var equipmentDb = context.Equipments
.Include(x => x.Camera)
.Include(x => x.Lens)
.FirstOrDefault(x => x.Id == equipment.Id);
Console.WriteLine("Equipment added: {0} (Camera: {1} - Lens: {2})",
manufacturer.Name,
equipmentDb.Camera.Model,
equipmentDb.Lens.Model);
}
}
