/// <summary>
/// Update a price of a product.
/// The price of the product will be update to new price that user enters.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
private static void UpdatePrice(ref int numberOfCatalogues)
{
if (numberOfCatalogues == 0)
{
Console.WriteLine("No catalogues exist. Please create a catalogue first.");
return;
}
ProductCatalogue cata = SelectCatalogue(numberOfCatalogues);
// Show all products in the catalogue and products in it.
ShowProductNamesAndPrice(cata);
if (cata.NumberOfProducts == 0)
{
return;
}
int index = SelectProduct(cata.NumberOfProducts);
//show a product that a user selected
ProductData data = cata.GetProduct(index - 1);
Console.Write("You have selected {0}.", data.ProductName);
Console.WriteLine("The current retail price is {0:c2}.", data.RetailPrice);
//update the price
data.RetailPrice = InputHelper.GetPositiveDoubleFromUser("Please enter the new price: ");
Console.WriteLine();
}
/// <summary>
/// Show all products in the catalog.
/// </summary>
/// <param name="cata">Product catalog.</param>
private static void ShowProductNamesAndPrice(ProductCatalogue cata)
{
if (cata == null || cata.NumberOfProducts == 0)
{
Console.WriteLine("No products exist.");
return;
}
for (int i = 0; i < cata.NumberOfProducts; i++)
{
ProductData data = cata.GetProduct(i);
//product number starts from 1, thus "+1"
Console.WriteLine("{0}. {1}: {2:c2}", (i + 1), data.ProductName, data.RetailPrice);
}
}
