static void Main(string[] args)
{
string keypress;
do
{
// 0)
// Display welcome text
Console.Clear();
Console.WriteLine("CQRS Pattern -- Customer List Context");
Console.WriteLine();
// 1)
Console.WriteLine("Select Action:");
Console.WriteLine();
Console.WriteLine("1) Add Customer");
Console.WriteLine("2) Remove Customer");
Console.WriteLine("3) View all Customers");
Console.WriteLine("4) Find Customer");
var selection = Console.ReadKey().KeyChar.ToString();
int.TryParse(selection, out int actionSelection);
Console.Clear();
// 2)
// Should be broken into individual methods / classes,
// utilizing other patterns such as the strategy pattern
// for handling the user's selection
switch (actionSelection)
{
case 1: // Add Customer
{
Console.Write("Customer ID (number): ");
var id = Console.ReadKey().KeyChar.ToString();
int.TryParse(id, out int customerId);
Console.WriteLine();
Console.Write("Customer Name: ");
var name = Console.ReadLine();
var cmd = new AddCustomerCommand(customerId, name);
_commandHandler.Handle(cmd);
Console.WriteLine();
Console.WriteLine("Customer added");
}
break;
case 2: // Remove Customer
{
Console.Write("Customer ID (number): ");
var id = Console.ReadKey().KeyChar.ToString();
int.TryParse(id, out int customerId);
var cmd = new RemoveCustomerCommand(customerId);
_commandHandler.Handle(cmd);
Console.WriteLine();
Console.WriteLine("Customer removed");
}
break;
case 3: // View all Customers
Console.WriteLine(_queryHandler.Handle(new GetAllCustomersQuery()));
break;
case 4: // Find Customer
{
Console.Write("Customer ID (number): ");
var id = Console.ReadKey().KeyChar.ToString();
int.TryParse(id, out int customerId);
var qry = new FindCustomerQuery(customerId);
Console.WriteLine();
Console.WriteLine(_queryHandler.Handle(qry));
}
break;
default: // Invalid choice - skip and display start menu
break;
}
// 3)
Console.WriteLine();
Console.WriteLine("Menu ( M )");
Console.WriteLine("Exit ( X )");
keypress = Console.ReadKey().KeyChar.ToString();
} while (keypress.ToLower() != "x");
}
public string Handle(FindCustomerQuery qry)
{
var customer = _db.Customers.FirstOrDefault(c => c.Id == qry.Id);
return(JsonSerializer.Serialize(customer));
}
