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C# DataModel Basic Example
The Code.
using System;
using System.Collections.Generic;
using System.Linq;
namespace CoreApp
{
class Program
{
static void Main(string[] args)
{
List<ProductModel> ListOfProducts = new List<ProductModel>();
ListOfProducts.Add(new ProductModel { ItemName = "Bread", ItemPrice = 0.64M });
ListOfProducts.Add(new ProductModel { ItemName = "Milk", ItemPrice = 0.65M });
ListOfProducts.Add(new ProductModel { ItemName = "Peanut Butter", ItemPrice = 1.04M });
ListOfProducts.Add(new ProductModel { ItemName = "Margerine", ItemPrice = 1.22M });
CartModel MyCart = new CartModel();
MyCart.Items = ListOfProducts;
foreach (ProductModel x in MyCart.Items)
{
Console.WriteLine(x.ItemName + " - " + x.ItemPrice);
}
Console.WriteLine(MyCart.Total());
}
}
public class ProductModel
{
public string ItemName { get; set; }
public decimal ItemPrice { get; set; }
}
public class CartModel
{
public List<ProductModel> Items { get; set; } = new List<ProductModel>();
public decimal Total()
{
return Items.Sum(x => x.ItemPrice);
}
}
}
The Explanation.
Lets us start in the middle...
public class ProductModel
{
public string ItemName { get; set; }
public decimal ItemPrice { get; set; }
}
We have a class that lets us set a string and a decimal price.
public class CartModel
{
public List<ProductModel> Items { get; set; } = new List<ProductModel>();
public decimal Total()
{
return Items.Sum(x => x.ItemPrice);
}
}
The CartModel is something new to me I'm not used to. Within the model we have a LIST rather than the usual integers and numbers etc. Well why not? Then we have a function Total. Within we are using the "Sum" function on the list. NOTE! You can't use "Sum" on lists without "using System.Linq;". Logic dictates the sum function is part of Linq that extends (gives extra features to) the regular List options like "Add".
Within the Total function we see a Lambda "x => x.ItemPrice". I am still working on understanding this properly...
Back in the Main function. We create a List of ProductModels then Add to this list be creating a new ProductModel each time. Then we create a CartModel and throw in our List of ProductModels to the Items. Oddly, as if by magic when we ask for the Total we get... the Total straight from the CartModel.
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