Linq extensions examplified

Linq_examples/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
+    </startup>
+</configuration>

Linq_examples/Book.cs

@@ -0,0 +1,8 @@
+namespace Linq_examples
+{
+    public class Book
+    {
+        public string Title { get; set; }
+        public float Price { get; set; }
+    }
+}

Linq_examples/BookRepository.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+
+namespace Linq_examples
+{
+    public class BookRepository
+    {
+        public IEnumerable<Book> GetBooks()
+        {
+            return new List<Book>
+            {
+                new Book(){Title="ADO.Net Step by step", Price=5},
+                new Book(){Title="ASP.Net MVC", Price=9.99f},
+                new Book(){Title="ASP.Net Web API", Price=12},
+                new Book(){Title="C# Advanced topics", Price=7},
+                new Book(){Title="C# Advanced topics", Price=9}
+            };
+        }
+    }
+}

Linq_examples/Linq_examples.csproj

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{668F191E-426E-498F-A896-A9E5215CD83E}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Linq_examples</RootNamespace>
+    <AssemblyName>Linq_examples</AssemblyName>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Book.cs" />
+    <Compile Include="BookRepository.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Linq_examples/Program.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Linq_examples
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var books = new BookRepository().GetBooks();
+
+            //Books with price less than 10, method 1
+            var cheapBooks = new List<Book>();
+            foreach (var book in books)
+            {
+                if (book.Price < 10)
+                    cheapBooks.Add(book);
+            }
+            foreach (var book in cheapBooks)
+                Console.WriteLine(book.Title + " " + book.Price);
+            //--------------------------------------------------------
+
+            //Books with price less than 10, method 2
+            var cheapBooks2 = books.Where(b => b.Price < 10);
+            foreach (var book in cheapBooks2)
+                Console.WriteLine(book.Title + " " + book.Price);
+
+            var cheapBooks3 = books.Where(b => b.Price < 10).OrderBy(b => b.Title);
+            foreach (var book in cheapBooks3)
+                Console.WriteLine(book.Title + " " + book.Price);
+
+            //LINQ Query Operators
+            var cheaperBooks = 
+                from b in books
+                where b.Price < 10
+                orderby b.Title
+                select b.Title;
+
+            foreach (var book in cheaperBooks)
+                Console.WriteLine(book);
+            //--------------------------------------------------------
+
+            //LINQ Extension Methods
+            var cheapBooks4 = books
+                .Where(b => b.Price < 10)
+                .OrderBy(b => b
+                .Title).Select(b => b.Title);
+
+            foreach (var book in cheapBooks4)
+                Console.WriteLine(book);
+
+            //--------------------------------------------------------
+
+            var sngbook = books.Single(b => b.Title == "ASP.Net MVC");
+            Console.WriteLine(sngbook.Title);
+
+            var sngnbook = books.SingleOrDefault(b => b.Title == "ASP.Net MVC++");
+            Console.WriteLine(sngnbook==null);
+
+            var fbook = books.First(b => b.Title == "C# Advanced topics");
+            Console.WriteLine(fbook.Title+" "+fbook.Price);
+
+            var fdbook = books.FirstOrDefault(b => b.Title == "C# Advanced topicsx");
+            Console.WriteLine(fdbook==null);
+
+            var lbook = books.Last(b => b.Title == "C# Advanced topics");
+            Console.WriteLine(lbook.Title + " " + lbook.Price);
+
+            var ldbook = books.LastOrDefault(b => b.Title == "C# Advanced topicsx");
+            Console.WriteLine(ldbook == null);
+
+            var skiptakebooks = books.Skip(2).Take(3);
+            foreach (var book in skiptakebooks)
+                Console.WriteLine(book.Title + " " + book.Price);
+
+            var count = books.Count();
+            Console.WriteLine(count);
+
+            var maxPrice = books.Max(b => b.Price);
+            Console.WriteLine(maxPrice);
+
+            var minPrice = books.Min(b => b.Price);
+            Console.WriteLine(minPrice);
+
+            var priceSum = books.Sum(b => b.Price);
+            Console.WriteLine(priceSum);
+        }
+    }
+}

Linq_examples/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Linq_examples")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Linq_examples")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("668f191e-426e-498f-a896-a9e5215cd83e")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

TrainingAdvancedTechniques.sln

@@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VideoEnc", "VideoEnc\VideoE
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExtensionMethods", "ExtensionMethods\ExtensionMethods.csproj", "{7EAB276E-2494-4BA6-BB91-2ADFD22FE331}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Linq_examples", "Linq_examples\Linq_examples.csproj", "{668F191E-426E-498F-A896-A9E5215CD83E}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -33,6 +35,10 @@ Global
 		{7EAB276E-2494-4BA6-BB91-2ADFD22FE331}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7EAB276E-2494-4BA6-BB91-2ADFD22FE331}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7EAB276E-2494-4BA6-BB91-2ADFD22FE331}.Release|Any CPU.Build.0 = Release|Any CPU
+		{668F191E-426E-498F-A896-A9E5215CD83E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{668F191E-426E-498F-A896-A9E5215CD83E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{668F191E-426E-498F-A896-A9E5215CD83E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{668F191E-426E-498F-A896-A9E5215CD83E}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE