Dependency inversion principle

.gitignore

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+/SRP/.vs
+/SRP/SRP/bin
+/SRP/SRP/obj
+/OCP_First_Example/.vs
+/OCP_First_Example/OCP_First_Example/bin
+/OCP_First_Example/OCP_First_Example/obj
+/OCP_Second_Example/.vs
+/OCP_Second_Example/OCP_Second_Example/bin
+/OCP_Second_Example/OCP_Second_Example/obj
+/DIP/.vs
+/DIP/DIP/bin
+/DIP/DIP/obj

DIP/DIP.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.168
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DIP", "DIP\DIP.csproj", "{6CC8448A-93CD-42DF-AF04-72C08A87B686}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6CC8448A-93CD-42DF-AF04-72C08A87B686}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6CC8448A-93CD-42DF-AF04-72C08A87B686}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6CC8448A-93CD-42DF-AF04-72C08A87B686}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6CC8448A-93CD-42DF-AF04-72C08A87B686}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {210AF8BA-7357-4817-A716-A29CBA522746}
+	EndGlobalSection
+EndGlobal

DIP/DIP/DIP.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

DIP/DIP/Employee.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public class Employee
+    {
+        public string Name { get; set; }
+        public Gender Gender { get; set; }
+        public Position Position { get; set; }
+    }
+}

DIP/DIP/EmployeeManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public class EmployeeManager: IEmployeeSerchable
+    {
+        private readonly List<Employee> _employees;
+
+        public EmployeeManager()
+        {
+            _employees = new List<Employee>();
+        }
+
+        public void AddEmployee(Employee employee)
+        {
+            _employees.Add(employee);
+        }
+
+        public IEnumerable<Employee> GetEmployeesByGenderAndPosition(Gender gender, Position position)
+            => _employees.Where(emp => emp.Gender == gender && emp.Position == position);
+    }
+}

DIP/DIP/EmployeeStatistics.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public class EmployeeStatistics
+    {
+        private readonly IEmployeeSerchable _emp;
+
+        public EmployeeStatistics(IEmployeeSerchable emp)
+        {
+            _emp = emp;
+        }
+
+        public int CountFemaleManagers() => 
+            _emp.GetEmployeesByGenderAndPosition(Gender.Female, Position.Manager).Count();
+    }
+}

DIP/DIP/Gender.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public enum Gender
+    {
+        Male,
+        Female
+    }
+}

DIP/DIP/IEmployeeSerchable.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public interface IEmployeeSerchable
+    {
+        IEnumerable<Employee> GetEmployeesByGenderAndPosition(Gender gender, Position position);
+    }
+}

DIP/DIP/Position.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    public enum Position
+    {
+        Administrator,
+        Manager,
+        Executive
+    }
+}

DIP/DIP/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DIP
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var empManager = new EmployeeManager();
+            empManager.AddEmployee(new Employee { Name = "Leen", Gender = Gender.Female, Position = Position.Manager });
+            empManager.AddEmployee(new Employee { Name = "Mike", Gender = Gender.Male, Position = Position.Administrator });
+
+            var stats = new EmployeeStatistics(empManager);
+            Console.WriteLine($"Number of female managers in our company is: {stats.CountFemaleManagers()}");
+        }
+    }
+}

README.md

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-# solid-principles-csharp
-This repository contains source code for the SOLID principles in C# on Code Maze blog
+# Liskov Substitution Principle
+##  https://code-maze.com/dependency-inversion-principle/
+