/// <summary>
/// Performs the operation of adding the numbers typed into the view by
/// the user.
/// </summary>
/// <remarks>
/// When this method is called, first, the inputs made by the user are validated.
/// <para />
/// If validation fails, then an error message box is displayed to the
/// user, and the input focus is set to the text box containing the
/// first value in the series.
/// <para />
/// Otherwise, the operation is performed and then the view is updated
/// with the results.
/// </remarks>
private void Add()
{
try
{
Validate();
_service.CalculateTotal(
_model,
new List <string>
{
_view.FirstValue,
_view.SecondValue,
_view.ThirdValue
}.ConvertAll(SafeGetNumber)
);
_view.TotalValue = Convert.ToString(
_model.Total, CultureInfo.InvariantCulture
);
_view.RunningTotalValue = Convert.ToString(
_model.RunningTotal, CultureInfo.InvariantCulture
);
_view.TotalValueTextBox.Focus();
}
catch (InvalidOperationException e)
{
MessageBox.Show(
_view, e.Message, Application.ProductName,
MessageBoxButtons.OK, MessageBoxIcon.Stop,
MessageBoxDefaultButton.Button1
);
_view.FirstValueTextBox.Focus();
}
}
