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Add project files.
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‎DynamicLinq/DynamicLinq.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎DynamicLinq/DynamicLinqSample.cs‎

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namespace DynamicLinq
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{
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public class DynamicLinqSample
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{
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}
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}

‎DynamicLinqSolution.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.9.34414.90
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Hogwards.Models", "Hogwards.Models\Hogwards.Models.csproj", "{43BA7485-C76A-4BA1-B168-0B3A546556AE}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DynamicLinqTestConsoleApp", "DynamicLinqTestConsoleApp\DynamicLinqTestConsoleApp.csproj", "{12697E47-C892-4370-BCD9-544498E6D44D}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{43BA7485-C76A-4BA1-B168-0B3A546556AE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{43BA7485-C76A-4BA1-B168-0B3A546556AE}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{43BA7485-C76A-4BA1-B168-0B3A546556AE}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{43BA7485-C76A-4BA1-B168-0B3A546556AE}.Release|Any CPU.Build.0 = Release|Any CPU
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{12697E47-C892-4370-BCD9-544498E6D44D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{12697E47-C892-4370-BCD9-544498E6D44D}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{12697E47-C892-4370-BCD9-544498E6D44D}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{12697E47-C892-4370-BCD9-544498E6D44D}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {6FD4875D-892E-48D4-A451-05C1825A0CCE}
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EndGlobalSection
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EndGlobal

‎DynamicLinqTestConsoleApp/DynamicLinqTestConsoleApp.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.1" />
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<PackageReference Include="System.Linq.Dynamic.Core" Version="1.3.7" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Hogwards.Models\Hogwards.Models.csproj" />
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</ItemGroup>
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</Project>

‎DynamicLinqTestConsoleApp/Program.cs‎

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using Hogwards.Models;
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using System.Linq.Dynamic.Core;
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using System.Linq.Expressions;
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using Microsoft.EntityFrameworkCore;
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var studentData = new StudentData();
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var students = studentData.GetStudents();
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//House.Name != null && House.Name == "RavenClaw"
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Console.WriteLine("----Where condition on property under a sub object----");
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Console.WriteLine("----House.Name == RavenClaw----");
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Console.WriteLine("----Not null check using np() function----");
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var studentByHouseResult = students
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.Where("np(House.Name) == \"Ravenclaw\"")
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.ToList();
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foreach (var student in studentByHouseResult)
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{
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Console.WriteLine("{0}\t\t{1}\t{2}", student.Name, student.House?.Name, student.Age);
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}
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//Dynamically creating lambda expressions
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Console.WriteLine("\n----Dynamic Lambda----");
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Console.WriteLine("----Students older than 14----");
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Expression<Func<Student, bool>> itExpression = DynamicExpressionParser
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.ParseLambda<Student, bool>(new ParsingConfig(), true, "House.Name == @0", "Hufflepuff");
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Expression<Func<Student, bool>> ageExpression = DynamicExpressionParser
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.ParseLambda<Student, bool>(new ParsingConfig(), true, "Age >= @0", 14);
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var conditionCheck = "age";
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var lambdaResult = students
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.Where("@0(it)", conditionCheck == "house" ? itExpression : ageExpression)
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.ToList();
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foreach (var student in lambdaResult)
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{
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Console.WriteLine("{0}\t\t{1}\t{2}", student.Name, student.House?.Name, student.Age);
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}
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//Group sort
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Console.WriteLine("\n----Group Sort----");
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Console.WriteLine("----Sort by house by descending order, then sort the students starting from elder to younger under each house----");
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var groupSortResult = students
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.OrderBy("np(House.Name, \"\") asc, age desc")
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.ToList();
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foreach (var student in groupSortResult)
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{
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Console.WriteLine("{0}\t\t{1}\t{2}", student.Name, student.House?.Name, student.Age);
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}
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//Selecting Data Using Dynamic LINQ
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//public List<Student> GetStudents() =>
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// students
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// .Select(s => new Student
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// {
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// Name = s.Name,
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// age = s.Age,
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// House = s.House.House,
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// })
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// .ToList();
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Console.WriteLine("\n----Selecting Data Using Dynamic LINQ----");
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var selectStudents = students
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.Select("new {Name, Gender, np(House.Name, \"\") as House}")
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.ToDynamicList();
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foreach (var student in selectStudents)
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{
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Console.WriteLine("{0}\t\t{1}\t{2}", student.Name, student.Gender, student.House);
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}
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Console.WriteLine("\n");

‎Hogwards.Models/Hogwards.Models.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎Hogwards.Models/House.cs‎

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namespace Hogwards.Models
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{
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public class House
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{
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public long Id { get; set; }
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public string Name { get; set; }
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}
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}

‎Hogwards.Models/Student.cs‎

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namespace Hogwards.Models
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{
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public class Student
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{
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public Guid Id { get; set; }
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public string Name { get; set; }
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public int Age { get; set; }
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public string Gender { get; set; }
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public House House { get; set; }
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}
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}

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