In software development, the Two-Step view pattern is a design pattern used to separate the rendering and presentation logic of a user interface. It helps to maintain a clear separation between the presentation of data and the user interaction logic, making the codebase more maintainable and easier to test.<\/p>\n
Step 1:<\/em> Presentation Logic<\/strong> Step 2:<\/em> View Logic<\/strong>
\nIn the first step, you define a class or set of classes responsible for the presentation logic. These classes are responsible for generating the data that will be displayed in the user interface but do not directly interact with the user interface elements. This separation allows you to write your presentation logic independently of the specific UI framework or technology you’re using.
\npublic class OrderViewModel
\n{
\n public string Customer_Name { get; set; }
\n public List<OrderItem> Order_Items { get; set; }
\n public decimal CalculateTotal()
\n {
\n return OrderItems.Sum(item => item.Price * item.Quantity);
\n }
\n}<\/code><\/p>\n
\nIn the second step, you define classes or components that are responsible for the user interface interaction and rendering. These classes interact with the UI elements and display the data provided by the presentation logic.
\npublic class OrderView
\n{
\n public void DisplayOrder(OrderViewModel order)
\n {
\n Console.WriteLine($\"Customer: {order.Customer_Name}\");
\n foreach (var item in order.Order_Items)
\n {
\n Console.WriteLine($\"{item.ProductName} - Quantity: {item.Quantity} - Price: {item.Price}\");
\n }
\n Console.WriteLine($\"Total: {order.CalculateTotal()}\");
\n }
\n}<\/code><\/p>\n