在列表<产品>中搜索产品名称

Question

该功能实现了列表中产品的搜索.我在if循环中的返回类型中收到错误.如果找到产品应该返回什么类型,如果找不到productname则返回类型应该是什么？应该将值返回到main()方法中的哪个变量？

namespace Sample
{

    public class Product
    {
        public int Id { get; set; }
        public string Name { get; set; }
    } 

    class Program
    {
        public static Product SearchProductsByName(string ProductsName, List<Product> products)
        {
            Product pd;
            pd= new Product();
            foreach (Product rs in products)
            {
                if (ProductsName == rs.Name)
                {
                    return pd;
                }
            }   
        }
    }

    static void Main(string[] args)
    {
        Product res=new Product();
        Console.WriteLine("Enter the name of the product");
        string pname = Console.ReadLine();
        res=SearchRestaurantsByName(pname , products);
    }

Answer 1

就这样说:

public static Product SearchProductsByName(string ProductsName, List products) {
  foreach (Product rs in products) 
    if (ProductsName == rs.Name)
      return rs; // <- The product found

  return null; // <- There's no such a product in the list
}

编辑:至于Main方法,预期类似的东西:

static void Main(string[] args) {
  // You should declare and fill in the products list
  // where you'll be looking for the product
  List<Product> products = new List<Product>() {
    //TODO: Replace it with the actual products
    new Product() {Name = "Product A"},
    new Product() {Name = "Product B"},
    new Product() {Name = "Product C"}
  };

  // Ask user for the product name
  Console.WriteLine("Enter the name of the product");

  string pname = Console.ReadLine();

  // The product user's looking for
  Product res = SearchRestaurantsByName(pname, products);

  //TODO: change this for required response to user
  if (res != null) 
    Console.WriteLine("The product is found");  
  else 
    Console.WriteLine("The product is not found");  
}