/// <summary>
/// Save new contact information
/// </summary>
/// <param name="model">contact view model</param>
/// <returns>unique identifier code</returns>
public int SaveContact(ContactViewModel model)
{
JSONReadWrite readWrite = new JSONReadWrite();
List <ContactViewModel> contacts = JsonConvert.DeserializeObject <List <ContactViewModel> >(readWrite.Read("contacts.json", "data"));
if (contacts == null)
{
contacts = new List <ContactViewModel>();
}
// get lastly inserted index- Id
int index = contacts.Max(c => c.Id);
// Increment by one
model.Id = index + 1;
// add to collection
contacts.Add(model);
// write to json
string jSONString = JsonConvert.SerializeObject(contacts);
readWrite.Write("contacts.json", "data", jSONString);
return(model.Id);
}
/// <summary>
/// Get contact with unique identifier
/// </summary>
/// <param name="id">unique identifier code</param>
/// <returns>existing contact</returns>
public ContactViewModel GetById(int id)
{
List <ContactViewModel> contacts = new List <ContactViewModel>();
JSONReadWrite readWrite = new JSONReadWrite();
contacts = JsonConvert.DeserializeObject <List <ContactViewModel> >(readWrite.Read("contacts.json", "data"));
return(contacts.FirstOrDefault(x => x.Id == id));
}
/// <summary>
/// List all contacts
/// </summary>
/// <returns>contacts</returns>
public List <ContactViewModel> ListContacts()
{
JSONReadWrite readWrite = new JSONReadWrite();
List <ContactViewModel> contacts = JsonConvert.DeserializeObject <List <ContactViewModel> >(readWrite.Read("contacts.json", "data"));
if (contacts == null)
{
contacts = new List <ContactViewModel>();
}
return(contacts);
}
/// <summary>
/// Delete existing contact information
/// </summary>
/// <param name="id">unique identifier code</param>
/// <returns>Is delete flag</returns>
public bool DeleteContact(int id)
{
List <ContactViewModel> contacts = new List <ContactViewModel>();
JSONReadWrite readWrite = new JSONReadWrite();
contacts = JsonConvert.DeserializeObject <List <ContactViewModel> >(readWrite.Read("contacts.json", "data"));
// find by id and remove record
int index = contacts.FindIndex(x => x.Id == id);
contacts.RemoveAt(index);
// write to json
string jSONString = JsonConvert.SerializeObject(contacts);
readWrite.Write("contacts.json", "data", jSONString);
return(true);
}
/// <summary>
/// Update existing contact information
/// </summary>
/// <param name="model">contact view model</param>
/// <returns>unique identifier</returns>
public int UpdateContact(ContactViewModel model)
{
JSONReadWrite readWrite = new JSONReadWrite();
List <ContactViewModel> contacts = JsonConvert.DeserializeObject <List <ContactViewModel> >(readWrite.Read("contacts.json", "data"));
if (contacts == null)
{
contacts = new List <ContactViewModel>();
}
// find by id and update record
int index = contacts.FindIndex(x => x.Id == model.Id);
contacts[index] = model;
// write to json
string jSONString = JsonConvert.SerializeObject(contacts);
readWrite.Write("contacts.json", "data", jSONString);
return(model.Id);
}