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IoC Implementation with Factory Pattern
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‎IoC_Principle/IoC_Principle.csproj

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{E6663652-D202-441B-AFE7-C6233140CE48}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>IoC_Principle</RootNamespace>
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<AssemblyName>IoC_Principle</AssemblyName>
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<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<Deterministic>true</Deterministic>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="WithIoC\AppDbContext\MongoDbContext.cs" />
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<Compile Include="WithIoC\AppDbContext\MsSqlDbContext.cs" />
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<Compile Include="WithIoC\ConnectionFactory.cs" />
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<Compile Include="WithIoC\DbConnection.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup />
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎IoC_Principle/Properties/AssemblyInfo.cs

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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("IoC_Principle")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("IoC_Principle")]
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[assembly: AssemblyCopyright("Copyright © 2021")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("e6663652-d202-441b-afe7-c6233140ce48")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

‎IoC_Principle/WithIoC/AppDbContext/MongoDbContext.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle.AppDbContext
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{
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public class MongoDbContext
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{
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public string GetData()
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{
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return "From MongoDb";
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}
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}
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}

‎IoC_Principle/WithIoC/AppDbContext/MsSqlDbContext.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle.AppDbContext
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{
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public class MsSqlDbContext
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{
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public string GetData()
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{
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return "From MsSql";
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}
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}
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}

‎IoC_Principle/WithIoC/ConnectionFactory.cs

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using IoC_Principle.AppDbContext;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle.WithIoC
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{
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public class ConnectionFactory
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{
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public static MongoDbContext GetConnection()
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{
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return new MongoDbContext();
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}
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}
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}

‎IoC_Principle/WithIoC/DbConnection.cs

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using IoC_Principle.AppDbContext;
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using IoC_Principle.WithIoC;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle
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{
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public class DbConnection
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{
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//Now the helper class is designed to import the DbConnection object instance.
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private MongoDbContext _mContext;
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public DbConnection()
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{
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_mContext = ConnectionFactory.GetConnection();
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}
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public string GetData()
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{
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return _mContext.GetData();
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}
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}
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}

‎SoftwarePrinciples.sln

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@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DRY_Principle", "DRY_Princi
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SOC_SeparationOfConcernsPrinciple", "SOC_SeparationOfConcernsPrinciple\SOC_SeparationOfConcernsPrinciple.csproj", "{CD4B3A04-4157-4929-A950-99B19F4E4718}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IoC_Principle", "IoC_Principle\IoC_Principle.csproj", "{E6663652-D202-441B-AFE7-C6233140CE48}"
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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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{CD4B3A04-4157-4929-A950-99B19F4E4718}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{CD4B3A04-4157-4929-A950-99B19F4E4718}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{CD4B3A04-4157-4929-A950-99B19F4E4718}.Release|Any CPU.Build.0 = Release|Any CPU
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{E6663652-D202-441B-AFE7-C6233140CE48}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E6663652-D202-441B-AFE7-C6233140CE48}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E6663652-D202-441B-AFE7-C6233140CE48}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E6663652-D202-441B-AFE7-C6233140CE48}.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

‎Solid_Principles/Solid_Principles.csproj

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</Compile>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="WithoutIoC\AppDbContext\MongoDbContext.cs" />
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<Compile Include="WithoutIoC\AppDbContext\MsSqlDbContext.cs" />
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<Compile Include="WithoutIoC\DbConnection.cs" />
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<EmbeddedResource Include="Properties\Resources.resx">
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<Generator>ResXFileCodeGenerator</Generator>
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<LastGenOutput>Resources.Designer.cs</LastGenOutput>

‎Solid_Principles/WithoutIoC/AppDbContext/MongoDbContext.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle.AppDbContext
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{
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public class MongoDbContext
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{
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public string GetData()
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{
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return "From MongoDb";
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}
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}
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}

‎Solid_Principles/WithoutIoC/AppDbContext/MsSqlDbContext.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle.AppDbContext
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{
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public class MsSqlDbContext
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{
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public string GetData()
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{
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return "From MsSql";
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}
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}
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}

‎Solid_Principles/WithoutIoC/DbConnection.cs

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using IoC_Principle.AppDbContext;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IoC_Principle
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{
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public class DbConnection
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{
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//In this example, there is a tight bond between the two classes.
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/*
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*As soon as we change the class we use here to MsSQLDbContext
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*instead of MongoDbContext, it will be necessary to make manual
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*changes to the code in the DbConnection class and in all places
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*where it is used in other classes, if any. Therefore, changes made
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*in the MongoDbContext class will also be reflected in our DbConnection class.
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*/
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private MongoDbContext _mContext;
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public DbConnection()
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{
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_mContext = new MongoDbContext();
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}
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public string GetData()
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{
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return _mContext.GetData();
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}
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}
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}

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