public static IDGenerator GetMemberIDGenerator(ApplicationDbContext dbContext)
{
if (_memberIDGenerator == null) {
lock (typeof(IDGenerator)) {
if(_memberIDGenerator == null)
{
var lastMemberID = dbContext.Members
.OrderByDescending(m => m.RegisterDate)
.Take(1)
.Select(m => m.MemberID)
.FirstOrDefault();
_memberIDGenerator = IDGenerator.CreateFromID(lastMemberID, "BE");
}
}
}
return _memberIDGenerator;
}
public static IDGenerator GetSaleToCustomerIDGenerator(ApplicationDbContext dbContext)
{
if (_saleToCustomerIDGenerator == null)
{
lock (typeof(IDGenerator))
{
if (_saleToCustomerIDGenerator == null)
{
var lastMemberID = dbContext.SaleToCustomer
.OrderByDescending(m => m.CreateDate)
.Take(1)
.Select(m => m.ID)
.FirstOrDefault();
_saleToCustomerIDGenerator = IDGenerator.CreateFromID(lastMemberID, "STC");
}
}
}
return _saleToCustomerIDGenerator;
}
private static IDGenerator CreateFromID(string lastID, string prefix)
{
IDGenerator g = new IDGenerator(prefix, 1);
if (string.IsNullOrWhiteSpace(lastID) == false) {
string newPrefix = g.GetPrefix();
if (lastID.StartsWith(newPrefix)) {
int currIdx;
int.TryParse(lastID.Substring(newPrefix.Length), out currIdx);
if(currIdx > 0)
{
g.SetNextIdx(currIdx + 1);
}
}
}
return g;
}