// technical validation carried out at the application level
private void Validate(NewAccount account)
{
if (!account.Email.Contains("@"))
throw new ValidationFailure("Not a valid email address");
if (account.Email.Length >= 50)
throw new ValidationFailure("Email address must be less than 50 characters");
if (account.Nickname.Length >= 25)
throw new ValidationFailure("Nickname must be less than 25 characters");
if (String.IsNullOrWhiteSpace(account.Email))
throw new ValidationFailure("You must supply an email");
if (String.IsNullOrWhiteSpace(account.Nickname))
throw new ValidationFailure("You must supply a Nickname");
}
public void RecommendAFriend(int referrerId, NewAccount friendsAccountDetails)
{
Validate(friendsAccountDetails);
// most technologies have similar transaction APIs
using (var transaction = new System.Transactions.TransactionScope())
{
try
{
// ... interact with domain multiple times
transaction.Complete();
}
catch(ReferralRejectedDueToLongTermOutstandingBalance)
{
throw new ApplicationError(
"Sorry, this referral cannot be completed. The referrer " +
"currently has an outstanding balance. Please contact " +
"Customer Services"
);
// transaction will roll back if Complete() not called
}
}
}
public void RecommendAFriend(int referrerId, NewAccount friendsAccountDetails)
{
Validate(friendsAccountDetails);
// most technologies have similar transaction APIs
using (var transaction = new System.Transactions.TransactionScope())
{
try
{
// ... interact with domain multiple times
transaction.Complete();
}
catch (ReferralRejectedDueToLongTermOutstandingBalance)
{
throw new ApplicationError(
"Sorry, this referral cannot be completed. The referrer " +
"currently has an outstanding balance. Please contact " +
"Customer Services"
);
// transaction will roll back if Complete() not called
}
}
}