Finished Query Syntax vs. Method Syntax

.gitignore

@@ -1,7 +1,7 @@
 # File created using '.gitignore Generator' for Visual Studio Code: https://bit.ly/vscode-gig
 
-# Created by https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,dotnetcore,executable,linux,macos,visualstudio
+# Created by https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,visualstudio,macos,linux,executable,dotnetcore,jetbrains+all
-# Edit at https://www.toptal.com/developers/gitignore?templates=windows,visualstudiocode,dotnetcore,executable,linux,macos,visualstudio
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows,visualstudiocode,visualstudio,macos,linux,executable,dotnetcore,jetbrains+all
 
 ### DotnetCore ###
 # .NET Core build folders
@@ -24,6 +24,95 @@ obj/
 *.vb
 *.wsf
 
+### JetBrains+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### JetBrains+all Patch ###
+# Ignores the whole .idea folder and all .iml files
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+
+.idea/
+
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
+
 ### Linux ###
 *~
 
@@ -458,7 +547,7 @@ MigrationBackup/
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
 
-# End of https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,dotnetcore,executable,linux,macos,visualstudio
+# End of https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,visualstudio,macos,linux,executable,dotnetcore,jetbrains+all
 
 # Custom rules (everything added below won't be overriden by 'Generate .gitignore File' if you use 'Update' option)
 

Features/Employee.cs

@@ -0,0 +1,8 @@
+namespace Features
+{
+    public class Employee
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}

Features/Features.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+    </PropertyGroup>
+
+</Project>

Features/MyLinq.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+
+namespace Features
+{
+    public static class MyLinq
+    {
+        // Implement a customized LINQ using extension  
+        public static int MyLinqCount<T>(this IEnumerable<T> sequence)
+        {
+            // Any IEnumerable<T> instance can use this method now as extension 
+            int count = 0;
+            foreach (var item in sequence)
+            {
+                count += 1;
+            }
+
+            return count;
+        }
+    }
+}

Features/Program.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Metadata;
+
+namespace Features
+{
+    class Program
+    {
+        // Modelling a company in this project
+        static void Main(string[] args)
+        {
+            /* Generic Delegate & Lambda Expression */
+            Func<int, int> square = x => x*x;// Define a generic delegate functions named square for square operation
+            Func<int, int, int> add = (x, y) =>
+            {
+                int temp = x + y;
+                return temp;
+            };
+
+            Action<int> write = x => Console.WriteLine(x);
+            write(square(add(3, 5)));
+            
+            /* LINQ & C# */
+
+            IEnumerable<Employee> developers = new Employee[]
+            {
+                new Employee {Id = 1, Name = "Scott"},
+                new Employee {Id = 2, Name = "Chris"}
+            };
+
+            List<Employee> sales = new List<Employee>()
+            {
+                new Employee {Id = 3, Name = "Alex"}
+            };
+            
+            Console.WriteLine(sales.MyLinqCount());
+
+            var enumerator = developers.GetEnumerator();
+
+            while (enumerator.MoveNext())
+            {
+                Console.WriteLine(enumerator.Current.Name); // .Current return value of current enumerator
+            }
+                
+            foreach (var person in developers) 
+            {
+                Console.WriteLine();
+            }
+
+            foreach (var employee in developers
+                .Where(e => e.Name.Length == 5)
+                .OrderBy(e => e.Name))
+            {
+                Console.WriteLine(employee.Name);
+            }
+
+            // LINQ (Method syntax)
+            var query = developers.Where(e => e.Name.Length == 5)
+                .OrderBy(e => e.Name);
+            
+            // LINQ (Query syntax)
+            var query2 = from developer in developers
+                where developer.Name.Length == 5
+                orderby developer.Name descending 
+                select developer;
+
+            foreach (var employee in query)
+            {
+                Console.WriteLine(employee.Name);
+            }
+
+            foreach (var employee in query2)
+            {
+                Console.WriteLine(employee.Name);
+            }
+        }
+    }
+}

Introduction/Introduction.sln

@@ -1,25 +0,0 @@
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linq-fundamentals.sln

@@ -0,0 +1,48 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26124.0
+MinimumVisualStudioVersion = 15.0.26124.0
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+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Features", "Features\Features.csproj", "{94C9EE4C-0609-464B-9BFF-BA3EED2A7263}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
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