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/Delegates/Delegates.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/Delegates/MathTool.cs

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+using System;
+
+namespace Delegates;
+
+public class MathTool
+{
+  public static int Sum(int x, int y)
+  {
+    return x + y;
+  }
+
+  public static int Diff(int x, int y)
+  {
+    return x - y;
+  }
+
+  public static void PrintSquare(int x)
+  {
+    Console.WriteLine("x^2 = " + x * x);
+  }
+
+  public static void PrintSquareRoot(int x)
+  {
+    Console.WriteLine("sqrt(x) = " + Math.Sqrt(x));
+  }
+}

SomeOfCSharpFeatures/Delegates/Program.cs

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+namespace Delegates;
+
+class Program
+{
+  public delegate int MathFunction(int a, int b);
+  public delegate void PrintFunction(int n);
+  static void Main(string[] args)
+  {
+    int x = 16, y = 2;
+    MathFunction mf = MathTool.Sum;
+    Console.WriteLine("mf({0}, {1}) = {2}", x, y, mf(x, y));
+    mf = MathTool.Diff;
+    Console.WriteLine("mf({0}, {1}) = {2}", x, y, mf(x, y));
+    PrintFunction pf = MathTool.PrintSquare;
+    pf += MathTool.PrintSquareRoot;
+    pf(x);
+#pragma warning disable CS8601 // Possible null reference assignment.
+    pf -= MathTool.PrintSquare;
+#pragma warning restore CS8601 // Possible null reference assignment.
+    Console.WriteLine();
+#pragma warning disable CS8602 // Dereference of a possibly null reference.
+    pf(y); //instead of pragma pf?.Invoke(y); can be used  
+#pragma warning restore CS8602 // Dereference of a possibly null reference.
+
+    Func<int, int, int> func = MathTool.Sum;
+    Console.WriteLine("func({0}, {1}) = {2}", x, y, func(x, y));
+    
+    Action<int> action = MathTool.PrintSquare;
+    action(x);
+  }
+}