public void BuildDatabase()
{
using (AddrbookDbContext ctx = new AddrbookDbContext(DbPath))
{
ctx.Database.EnsureDeleted();
ctx.Database.EnsureCreated();
}
}
public IEnumerable <Addrbook> LoadAddressBooks()
{
using (AddrbookDbContext ctx = new AddrbookDbContext(DbPath))
{
foreach (Addrbook item in ctx.Addrbooks.Select(p => p))
{
yield return(item);
}
}
}
public void SaveStoredData(string contact_name, string address)
{
using (AddrbookDbContext ctx = new AddrbookDbContext(DbPath))
{
SaveStoredData(ctx, contact_name, address);
try
{
ctx.SaveChanges();
}
catch (Exception ex)
{
string str = ex.Message;
}
}
}
private static void SaveStoredData(AddrbookDbContext ctx, string contact_name, string address)
{
Addrbook addrBook = ctx.Addrbooks.FirstOrDefault(p => p.Address == address);
if (addrBook == null)
{
ctx.Addrbooks.Add(new Addrbook
{
ContactName = contact_name,
Address = address
});
}
else
{
addrBook.ContactName = contact_name;
}
}
public bool DeleteAddress(string address)
{
using (AddrbookDbContext ctx = new AddrbookDbContext(DbPath))
{
Addrbook addrbook = ctx.Addrbooks.FirstOrDefault(p => p.Address.SequenceEqual(address));
if (address != null)
{
ctx.Addrbooks.Remove(addrbook);
try
{
ctx.SaveChanges();
}
catch (Exception ex)
{
string str = ex.Message;
}
}
}
return(true);
}
