public string RunWrongApproach()
{
var explanation = new StringBuilder();
explanation.AppendLine($"--- WRONG APPROACH ---");
var rectangle = new WrongApproach.Rectangle {
Height = 10, Width = 3
};
explanation.AppendLine($"We have created a rectangle of 10x3: Height[{rectangle.Height}] Width[{rectangle.Width}] Area[{rectangle.GetArea()}]");
var square = new WrongApproach.Square {
Height = 10, Width = 10
};
explanation.AppendLine($"And a square of 10x10: Height[{ square.Height}] Width[{ square.Width}] Area[{ square.GetArea()}]");
var approach = new WrongApproach();
var rectangleTest = approach.ValidateAreaCalculation(new WrongApproach.Rectangle());
var squareTest = approach.ValidateAreaCalculation(new WrongApproach.Square());
explanation.AppendLine($"Using both through their base class, we test that GIVEN sides of 6x8 WHEN we get the area THEN we get 48");
explanation.AppendLine($"\tRectangle object test: {( rectangleTest ? "passed" : "NOT passed")}");
explanation.AppendLine($"\tSquare object test: {(squareTest ? "passed" : "NOT passed")}");
explanation.AppendLine();
explanation.AppendLine($"In real life a square is also a rectangle, but that scenario not be always coded that way unless that \"square\" and \"rectangle\" are treated as properties of an object called, for instance, \"shape\"");
return(explanation.ToString());
}
public string RunWrongApproach()
{
var explanation = new StringBuilder();
explanation.AppendLine("--- WRONG APPROACH ---");
explanation.AppendLine("Getting all items using a common interface will introduce several properties not used in objects");
var wrongApproach = new WrongApproach();
List <WrongApproach.SellableItem> items = wrongApproach.GetAllProducts();
var vegetableProducts = items.Where(x => x.MeasurementUnit == "Kg").ToList();
var ageragePriceOfVegetables = vegetableProducts.Average((v) => v.Price);
explanation.AppendLine("In this approach there are:");
explanation.AppendLine($"\t{vegetableProducts.Count} vegetables products with an average price of {ageragePriceOfVegetables}€/Kg");
var tvProducts = items.Where(x => x.Name.ToLower().Contains("tv")).ToList();
var differentResolutions = tvProducts.Select(tv => tv.Resolution).Distinct().Count();
explanation.AppendLine($"\t{tvProducts.Count} TVs of {differentResolutions} different resolutions");
var schollItems = items.Where(x => "Clothing4Youth,WealthyLife,LearningSolutions".ToLower().Contains(x.ProviderName.ToLower())).ToList();
var shoesItems = schollItems.Where(i => i.MeasurementUnit == "pair").Count();
explanation.AppendLine($"\t{schollItems.Count} school items, and {shoesItems} of them are shoes");
string vegetableProperties = vegetableProducts.First().GetType().GetProperties().Select(p => p.Name).Aggregate((name, nextName) => $"{name}, {nextName}");
explanation.AppendLine("Vegetable visible properties: " + vegetableProperties);
return(explanation.ToString());
}
