public void Update(WCFCustomerType customer)
{
try
{
XElement customers = XElement.Load(dataFilePath);
var customerFNameElements =
from cust in customers.Elements("Customer")
where (Int32)cust.Attribute("ID") == customer.CustomerID
select cust.Element("CustomerFName");
var customerLNameElements =
from cust in customers.Elements("Customer")
where (Int32)cust.Attribute("ID") == customer.CustomerID
select cust.Element("CustomerLName");
// The following will throw InvalidOperationException if
// the collections are empty meaning a customer with
// the specified ID does not exist.
XElement customerFNameElement =
customerFNameElements.First();
customerFNameElement.SetValue(customer.FirstName);
XElement customerLNameElement =
customerLNameElements.First();
customerLNameElement.SetValue(customer.LastName);
customers.Save(dataFilePath);
}
catch (InvalidOperationException)
{
throw new ObjectNotFoundException(
"Unable to update the customer with ID = " +
customer.CustomerID.ToString() +
". The customer no longer exists.");
}
catch (Exception innerExeption)
{
throw new RuntimeException(
"There was a problem updating the customer with ID = " +
customer.CustomerID.ToString() + ".", innerExeption);
}
}
public WCFCustomerType Create(WCFCustomerType newCustomer)
{
try
{
XElement customers = XElement.Load(dataFilePath);
Int32 nextCustomerId =
(Int32)customers.Attribute("NextCustomerId");
WCFCustomerType returnCustomer = new WCFCustomerType();
returnCustomer.CustomerID = nextCustomerId;
returnCustomer.FirstName = newCustomer.FirstName;
returnCustomer.LastName = newCustomer.LastName;
XElement newCustomerElement = new XElement("Customer");
newCustomerElement.SetAttributeValue("ID",
nextCustomerId);
XElement newCustomerFNameElement =
new XElement("CustomerFName", returnCustomer.FirstName);
XElement newCustomerLNameElement =
new XElement("CustomerLName", returnCustomer.LastName);
newCustomerElement.Add(newCustomerFNameElement);
newCustomerElement.Add(newCustomerLNameElement);
customers.Add(newCustomerElement);
customers.SetAttributeValue("NextCustomerId",
nextCustomerId + 1);
customers.Save(dataFilePath);
return(returnCustomer);
}
catch (Exception generalException)
{
throw new RuntimeException(
"There was a problem creating a new customer.",
generalException);
}
}