static void Main()
{
//Create an Entity Framework (EF) code first data model for keeping phonebook holding contacts with phones and emails.
//It should have several entities:
//• Contacts have name and optionally position, company, emails, phones, site (URL) and notes (free text).
//• Emails hold email address.
//• Phones hold phone number.
//Seed your database with a few contacts, using the EF migrations framework.
//It is OK to drop the database in case of model changes or use any other migration strategy
//like automatic upgrade to the latest DB schema.
//To test your data model, list all contacts along with their phones and emails.
var context = new PhonebookContext();
//set database
//var count = context.Contacts.Count();
//Console.WriteLine(count);
//list all contacts along with their phones and emails
var people = context.Contacts
.Select(c => new
{
ContactName = c.Name,
ContactPhones = c.Phones.Select(p => p.PhoneNumber),
ContactEmails = c.Emails.Select(e => e.EmailAddress)
}).ToList();
foreach (var person in people)
{
Console.WriteLine("--" + person.ContactName);
Console.WriteLine("Phones: " + String.Join(", ", person.ContactPhones));
Console.WriteLine("Emails: " + String.Join(", ", person.ContactEmails));
}
}
static void Main()
{
//Problem 7. Import Contacts from JSON
//Write a C# application based on your EF code first data model for importing into the DB
//a set of phonebook contacts given in the file contacts.json.
//The only mandatory property is name. All the others are optional.
//You should parse the JSON and throw an exception in case of incorrect data, e.g. when a required element is missing
//or an invalid value is given. The size of the JSON file will be less than 10 MB. Use a JSON parser by choice.
//You should correctly import the contacts into the DB.
//You should correctly import the emails and phones into the DB.
//Insert each contact in a separate transaction. A contact should either be inserted correctly along with all its emails
//and phones, or no part of it should be inserted at all.
//Print as output a single line for each contact from the input JSON: either "Contact <name> imported"
//or "Error: <error message>". Error messages should describe briefly the problem (as free text) and may optionally
//include exception stack-trace.
var context = new PhonebookContext();
//JsonConvert.DeserializeObject() не поддържа десериализация на масиви от обекти
string objectsArray = File.ReadAllText("../../contacts.json");
JArray contacts = JArray.Parse(objectsArray);
foreach (JToken contact in contacts) //JToken представлява един ред от JSON-a и мога да си го викам по име
{
Contact dbContact = new Contact();
//var name = contact["name"] ?? null;
if (contact["name"] == null)
{
Console.WriteLine("Error: Name is required");
continue;
}
dbContact.Name = contact["name"].ToString();
if (contact["company"] != null)
{
dbContact.Company = contact["company"].ToString();
}
if (contact["position"] != null)
{
dbContact.Position = contact["position"].ToString();
}
if (contact["site"] != null)
{
dbContact.SiteUrl = contact["site"].ToString();
}
if (contact["notes"] != null)
{
dbContact.Notes = contact["notes"].ToString();
}
if (contact["phones"] != null)
{
foreach (var phone in contact["phones"])
{
Phone dbPhone = new Phone()
{
PhoneNumber = phone.ToString()
};
dbContact.Phones.Add(dbPhone);
}
}
if (contact["emails"] != null)
{
foreach (var email in contact["emails"])
{
Email dbEmail = new Email()
{
EmailAddress = email.ToString()
};
dbContact.Emails.Add(dbEmail);
}
}
context.Contacts.Add(dbContact);
Console.WriteLine("Contact {0} imported", dbContact.Name);
context.SaveChanges();
}
}