Update live with master

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/ICustomer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace customer_relationship
+{
+    public interface ICustomer
+    {
+        IEnumerable<IOrder> PreviousOrders { get; }
+
+        DateTime DateJoined { get; }
+        DateTime? LastOrder { get; }
+        string Name { get; }
+        IDictionary<DateTime, string> Reminders { get; }
+
+        /*
+        // <SnippetLoyaltyDiscountVersionOne>
+        // Version 1:
+        public decimal ComputeLoyaltyDiscount()
+        {
+            DateTime TwoYearsAgo = DateTime.Now.AddYears(-2);
+            if ((DateJoined < TwoYearsAgo) && (PreviousOrders.Count() > 10))
+            {
+                return 0.10m;
+            }
+            return 0;
+        }
+        // </SnippetLoyaltyDiscountVersionOne>
+        */
+
+        /*
+        // <SnippetLoyaltyDiscountVersionTwo>
+        // Version 2:
+        public static void SetLoyaltyThresholds(
+            TimeSpan ago, 
+            int minimumOrders = 10, 
+            decimal percentageDiscount = 0.10m)
+        {
+            length = ago;
+            orderCount = minimumOrders;
+            discountPercent = percentageDiscount;
+        }
+        private static TimeSpan length = new TimeSpan(365 * 2, 0,0,0); // two years
+        private static int orderCount = 10;
+        private static decimal discountPercent = 0.10m;
+
+        public decimal ComputeLoyaltyDiscount()
+        {
+            DateTime start = DateTime.Now - length;
+
+            if ((DateJoined < start) && (PreviousOrders.Count() > orderCount))
+            {
+                return discountPercent;
+            }
+            return 0;
+        }
+        // </SnippetLoyaltyDiscountVersionTwo>
+        */
+
+        // Version 3:
+        public static void SetLoyaltyThresholds(TimeSpan ago, int minimumOrders, decimal percentageDiscount)
+        {
+            length = ago;
+            orderCount = minimumOrders;
+            discountPercent = percentageDiscount;
+        }
+        private static TimeSpan length = new TimeSpan(365 * 2, 0, 0, 0); // two years
+        private static int orderCount = 10;
+        private static decimal discountPercent = 0.10m;
+
+        // <SnippetFinalVersion>
+        public decimal ComputeLoyaltyDiscount() => DefaultLoyaltyDiscount(this);
+        protected static decimal DefaultLoyaltyDiscount(ICustomer c)
+        {
+            DateTime start = DateTime.Now - length;
+
+            if ((c.DateJoined < start) && (c.PreviousOrders.Count() > orderCount))
+            {
+                return discountPercent;
+            }
+            return 0;
+        }
+        // </SnippetFinalVersion>
+    }
+}

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/IOrder.cs

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+using System;
+
+namespace customer_relationship
+{
+    public interface IOrder
+    {
+        DateTime Purchased { get; }
+        decimal Cost { get; }
+    }
+}

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/Program.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Linq;
+
+namespace customer_relationship
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // <SnippetTestDefaultImplementation>
+            SampleCustomer c = new SampleCustomer("customer one", new DateTime(2010, 5, 31))
+            {
+                Reminders =
+                {
+                    { new DateTime(2010, 08, 12), "childs's birthday" },
+                    { new DateTime(1012, 11, 15), "anniversary" }
+                }
+            };
+
+
+            SampleOrder o = new SampleOrder(new DateTime(2012, 6, 1), 5m);
+            c.AddOrder(o);
+
+            o = new SampleOrder(new DateTime(2103, 7, 4), 25m);
+            c.AddOrder(o);
+
+            // <SnippetHighlightCast>
+            // Check the discount:
+            ICustomer theCustomer = c;
+            Console.WriteLine($"Current discount: {theCustomer.ComputeLoyaltyDiscount()}");
+            // </SnippetHighlightCast>
+            // </SnippetTestDefaultImplementation>
+
+            // Add more orders to get the discount:
+            DateTime recurring = new DateTime(2013, 3, 15);
+            for(int i = 0; i < 15; i++)
+            {
+                o = new SampleOrder(recurring, 19.23m * i);
+                c.AddOrder(o);
+
+                recurring.AddMonths(2);
+            }
+
+
+
+            Console.WriteLine($"Data about {c.Name}");
+            Console.WriteLine($"Joined on {c.DateJoined}. Made {c.PreviousOrders.Count()} orders, the last on {c.LastOrder}");
+            Console.WriteLine("Reminders:");
+            foreach(var item in c.Reminders)
+            {
+                Console.WriteLine($"\t{item.Value} on {item.Key}");
+            }
+            foreach (IOrder order in c.PreviousOrders)
+                Console.WriteLine($"Order on {order.Purchased} for {order.Cost}");
+
+            Console.WriteLine($"Current discount: {theCustomer.ComputeLoyaltyDiscount()}");
+
+            // <SnippetSetLoyaltyThresholds>
+            ICustomer.SetLoyaltyThresholds(new TimeSpan(30, 0, 0, 0), 1, 0.25m);
+            Console.WriteLine($"Current discount: {theCustomer.ComputeLoyaltyDiscount()}");
+            // </SnippetSetLoyaltyThresholds>
+
+        }
+    }
+}

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/SampleCustomer.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace customer_relationship
+{
+    public class SampleCustomer : ICustomer
+    {
+        public SampleCustomer(string name, DateTime dateJoined) => 
+            (Name, DateJoined) = (name, dateJoined);
+
+        private List<IOrder> allOrders = new List<IOrder>();
+
+        public IEnumerable<IOrder> PreviousOrders => allOrders;
+
+        public DateTime DateJoined { get; }
+
+        public DateTime? LastOrder { get; private set; }
+
+        public string Name { get; }
+
+        private Dictionary<DateTime, string> reminders = new Dictionary<DateTime, string>();
+        public IDictionary<DateTime, string> Reminders => reminders;
+
+        public void AddOrder(IOrder order)
+        {
+            if (order.Purchased > (LastOrder ?? DateTime.MinValue))
+                LastOrder = order.Purchased;
+            allOrders.Add(order);
+        }
+
+        // <SnippetOverrideAndExtend>
+        public decimal ComputeLoyaltyDiscount()
+        {
+           if (PreviousOrders.Any() == false)
+                return 0.50m;
+            else
+                return ICustomer.DefaultLoyaltyDiscount(this);
+        }
+        // </SnippetOverrideAndExtend>
+    }
+}

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/SampleOrder.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace customer_relationship
+{
+    public class SampleOrder : IOrder
+    {
+        public SampleOrder(DateTime purchase, decimal cost) =>
+            (Purchased, Cost) = (purchase, cost);
+
+        public DateTime Purchased { get; }
+
+        public decimal Cost { get; }
+    }
+}

csharp/tutorials/default-interface-members-versions/finished/customer-relationship/customer-relationship.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <RootNamespace>customer_relationship</RootNamespace>
+    <LangVersion>8.0</LangVersion>
+  </PropertyGroup>
+
+</Project>

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/ICustomer.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+
+namespace customer_relationship
+{
+    // <SnippetICustomerVersion1>
+    public interface ICustomer
+    {
+        IEnumerable<IOrder> PreviousOrders { get; }
+
+        DateTime DateJoined { get; }
+        DateTime? LastOrder { get; }
+        string Name { get; }
+        IDictionary<DateTime, string> Reminders { get; }
+    }
+    // </SnippetICustomerVersion1>
+}

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/IOrder.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace customer_relationship
+{
+    // <SnippetIOrderVersion1>
+    public interface IOrder
+    {
+        DateTime Purchased { get; }
+        decimal Cost { get; }
+    }
+    // </SnippetIOrderVersion1>
+}

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/Program.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Linq;
+
+namespace customer_relationship
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            SampleCustomer c = new SampleCustomer("customer one", new DateTime(2010, 5, 31))
+            {
+                Reminders =
+                {
+                    { new DateTime(2010, 08, 12), "childs's birthday" },
+                    { new DateTime(1012, 11, 15), "anniversary" }
+                }
+            };
+
+
+            SampleOrder o = new SampleOrder(new DateTime(2012, 6, 1), 5m);
+            c.AddOrder(o);
+
+            o = new SampleOrder(new DateTime(2103, 7, 4), 25m);
+            c.AddOrder(o);
+
+            Console.WriteLine($"Data about {c.Name}");
+            Console.WriteLine($"Joined on {c.DateJoined}. Made {c.PreviousOrders.Count()} orders, the last on {c.LastOrder}");
+            Console.WriteLine("Reminders:");
+            foreach(var item in c.Reminders)
+            {
+                Console.WriteLine($"\t{item.Value} on {item.Key}");
+            }
+            foreach (IOrder order in c.PreviousOrders)
+                Console.WriteLine($"Order on {order.Purchased} for {order.Cost}");
+
+        }
+    }
+}

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/SampleCustomer.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+
+namespace customer_relationship
+{
+    public class SampleCustomer : ICustomer
+    {
+        public SampleCustomer(string name, DateTime dateJoined) => 
+            (Name, DateJoined) = (name, dateJoined);
+
+        private List<IOrder> allOrders = new List<IOrder>();
+
+        public IEnumerable<IOrder> PreviousOrders => allOrders;
+
+        public DateTime DateJoined { get; }
+
+        public DateTime? LastOrder { get; private set; }
+
+        public string Name { get; }
+
+        private Dictionary<DateTime, string> reminders = new Dictionary<DateTime, string>();
+        public IDictionary<DateTime, string> Reminders => reminders;
+
+        public void AddOrder(IOrder order)
+        {
+            if (order.Purchased > (LastOrder ?? DateTime.MinValue))
+                LastOrder = order.Purchased;
+            allOrders.Add(order);
+        }
+    }
+}

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/SampleOrder.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace customer_relationship
+{
+    public class SampleOrder : IOrder
+    {
+        public SampleOrder(DateTime purchase, decimal cost) =>
+            (Purchased, Cost) = (purchase, cost);
+
+        public DateTime Purchased { get; }
+
+        public decimal Cost { get; }
+    }
+}

csharp/tutorials/default-interface-members-versions/starter/customer-relationship/customer-relationship.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <RootNamespace>customer_relationship</RootNamespace>
+  </PropertyGroup>
+
+</Project>