/// <summary>
/// Converts customer object to an equivalent string representation using specified format and specific formatting information.
/// </summary>
/// <param name="format">A format string containing formatting specifications</param>
/// <param name="arg">Instance of the Customer</param>
/// <param name="formatProvider">An object that supplies format information about the current instance.</param>
/// <returns>The string representation of Customer object, formatted as specified by format and formatProvider</returns>
/// <exception cref="FormatException">The format string is invalid</exception>
/// <exception cref="ArgumentException">Object reference doesn't refer to Customer instance</exception>
public string Format(string format, object arg, IFormatProvider formatProvider)
{
Customer customer = arg as Customer;
if (customer == null)
{
throw new ArgumentException("Wrong argument type");
}
try
{
string result = customer.ToString(format, formatProvider);
return(result);
}
catch (FormatException)
{
switch (format.ToUpperInvariant())
{
case "E":
return($"Customer record: {customer.Name} Revenue: {customer.Revenue} Contact phone: {customer.ContactPhone}");
default:
throw new FormatException();
}
}
}
/// <summary>
///
/// </summary>
/// <param name="format"></param>
/// <param name="obj"></param>
/// <param name="formatProvider"></param>
/// <returns></returns>
public string Format(string format, object obj, IFormatProvider formatProvider)
{
Customer customer = (Customer)obj;
format = format.ToUpperInvariant();
if (string.IsNullOrEmpty(format))
{
format = "G";
}
switch (format)
{
case "NP":
return(customer?.Name + " " + customer?.ContactPhone);
case "RN":
return(customer?.Revenue.ToString("C", formatProvider) + " " + customer?.Name);
case "RP":
return(customer?.Revenue.ToString("C", formatProvider) + " " + customer?.ContactPhone);
case "PN":
return(customer?.ContactPhone + " " + customer?.Name);
case "PR":
return(customer?.ContactPhone + " " + customer?.Revenue.ToString("C", formatProvider));
default:
try
{
return(customer.ToString(format, formatProvider));
}
catch (Exception)
{
throw new FormatException($"Bad format {format}. Atatata");
}
}
}