PI06 i PI06-1. Docker definitions for MSSQL and Postgres. Data seeder/generator for countries and people. Entity Framework example with variants for Postgres and MSSQL

SomeOfCSharpFeatures/PropertiesIndexersRefOut/Program.cs

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+using PropertiesIndexersRefOut;
+
+Triple t1 = new Triple
+{
+  First = 456,
+  Second = 789
+};
+
+Triple t2 = new Triple
+{
+  First = 1000,
+  Second = 2000
+};
+
+Console.WriteLine("t1 + t2 = " + (t1 + t2));
+
+CreateRandomTriple(t1, ref t2, out Triple t3);
+
+Console.WriteLine("t1 = " + t1);
+Console.WriteLine("t2 = " + t2);
+Console.WriteLine("t3 = " + t3);
+
+Console.WriteLine(t1["A", 1]);
+Console.WriteLine(t1["B", 2]);
+Console.WriteLine(t1["B", 3]);
+
+PrintTriples(t1, t2, t3);
+
+void PrintTriples(params Triple[] triples)
+{
+  foreach (var t in triples)
+  {
+    Console.WriteLine(t);
+  }
+}
+
+void CreateRandomTriple(Triple t1, ref Triple t2, out Triple t3)
+{
+  Random r = new Random();
+  t3 = new Triple
+  {
+    First = r.Next(t1.First, t2.Second),
+    Second = r.Next(maxValue: t2.Second, minValue: t1.First)
+  };
+
+  t1 = t3;
+  t2 = t3;
+}

SomeOfCSharpFeatures/PropertiesIndexersRefOut/PropertiesIndexersRefOut.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

SomeOfCSharpFeatures/PropertiesIndexersRefOut/Triple.cs

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+namespace PropertiesIndexersRefOut;
+
+public class Triple
+{
+  private int first;
+  public int First
+  {
+    get
+    {
+      return first;
+    }
+    set
+    {
+      first = value;
+    }
+  }
+
+  public int Second { get; set; }
+
+  public int Third => First + Second;
+  public override string ToString()
+  {
+    return $"({First}, {Second}, {Third})";
+  }
+
+  #region Indexer
+  public int this[string s, int position]  
+  {      
+    get
+    {        
+      int num;
+      switch (s)
+      {
+        case "A":
+          num = this.First;
+          break;
+        case "B":
+          num = this.Second;
+          break;
+        case "C":
+          num = this.Third;
+          break;
+        default:
+          throw new ArgumentException("Invalid position in triple (should be A, B, or C)");
+      }
+      int digit = 0;
+      while(num > 0 && position > 0)
+      {
+        digit = num % 10;
+        num /= 10;
+        position--;
+      }
+      return digit;
+    }
+  }
+  #endregion
+
+
+  #region Operator overloading
+  public static Triple operator +(Triple x, Triple y)
+  {    
+    return new Triple
+    {
+      First = x.First + y.First,
+      Second = x.Second + y.Second
+    };
+  }
+  #endregion
+
+
+
+
+}