state pattern

DesignPattern/DesignPattern.sln

@@ -39,6 +39,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Command", "Command\Command.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Template", "Template\Template.csproj", "{8C1CA345-A2D4-46E2-9FD0-34E8BE4CE7C4}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "State", "State\State.csproj", "{008D8C56-8546-4EB1-83C6-68FAF2051895}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -117,6 +119,10 @@ Global
 		{8C1CA345-A2D4-46E2-9FD0-34E8BE4CE7C4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8C1CA345-A2D4-46E2-9FD0-34E8BE4CE7C4}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8C1CA345-A2D4-46E2-9FD0-34E8BE4CE7C4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{008D8C56-8546-4EB1-83C6-68FAF2051895}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{008D8C56-8546-4EB1-83C6-68FAF2051895}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{008D8C56-8546-4EB1-83C6-68FAF2051895}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{008D8C56-8546-4EB1-83C6-68FAF2051895}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

DesignPattern/State/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8.1" />
+    </startup>
+</configuration>

DesignPattern/State/BadState.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal class BadState : State
+    {
+        public BadState()
+        {
+            this.InterestRate = 35.00M;
+        }
+
+        public override void ChangeScore(Context context, int score)
+        {
+            if (score >= 600)
+            {
+                context.CurrentState = new NormalState();
+
+                context.CurrentState.ChangeScore(context, score);
+            }
+        }
+    }
+}

DesignPattern/State/Client.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal class Client
+    {
+        public static void HowToTest()
+        {
+            Context ctx = new Context();
+            ctx.SetCreditScore(550);
+            Console.WriteLine($"{ctx.CurrentState.InterestRate}%");
+
+            ctx.SetCreditScore(760);
+            Console.WriteLine($"{ctx.CurrentState.InterestRate}%");
+        }
+    }
+}

DesignPattern/State/Context.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal class Context
+    {
+        public State CurrentState { get; set; }
+
+        public Context()
+        {
+            this.CurrentState = new NormalState();
+        }
+
+        public void SetCreditScore(int creditScore)
+        {
+            Console.WriteLine($"{creditScore}");
+            this.CurrentState.ChangeScore(this, creditScore);
+        }
+    }
+}

DesignPattern/State/NormalState.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal class NormalState : State
+    {
+        public NormalState()
+        {
+            this.InterestRate = 25.00M;
+        }
+
+        public override void ChangeScore(Context context, int score)
+        {
+            if (score < 600)
+            {
+                context.CurrentState = new BadState();
+
+                context.CurrentState.ChangeScore(context, score);
+            }
+            else if (score >= 750)
+            {
+                context.CurrentState = new VIPState();
+
+                context.CurrentState.ChangeScore(context, score);
+            }
+        }
+    }
+}

DesignPattern/State/Program.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    /*
+     * 카테고리: 행위 패턴
+     * 개요: 상태별 행위를 별도의 클래스에 구현하여
+     * 복잡한 상태별 행위를 효율적으로 분리하여 구현하고
+     * 새로운 상태에 따른 행위를 유연하게 추가/확장함
+     * 
+     * Context: 현재 상태를 기억
+     * State: 인터페이스
+     * Concrete State: 각 상태별 행위 구현
+     */
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Client.HowToTest();
+
+            Console.ReadKey();
+        }
+    }
+}

DesignPattern/State/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해 
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("State")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("State")]
+[assembly: AssemblyCopyright("Copyright ©  2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에 
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+// 이 프로젝트가 COM에 노출되는 경우 다음 GUID는 typelib의 ID를 나타냅니다.
+[assembly: Guid("008d8c56-8546-4eb1-83c6-68faf2051895")]
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+//      주 버전
+//      부 버전 
+//      빌드 번호
+//      수정 버전
+//
+// 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
+// 기본값으로 할 수 있습니다.
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

DesignPattern/State/State.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal abstract class State
+    {
+        public decimal InterestRate { get; protected set; }
+
+        public abstract void ChangeScore(Context context, int score);
+    }
+}

DesignPattern/State/State.csproj

@@ -0,0 +1,59 @@
+<?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>{008D8C56-8546-4EB1-83C6-68FAF2051895}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>State</RootNamespace>
+    <AssemblyName>State</AssemblyName>
+    <TargetFrameworkVersion>v4.8.1</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="BadState.cs" />
+    <Compile Include="Client.cs" />
+    <Compile Include="Context.cs" />
+    <Compile Include="NormalState.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="State.cs" />
+    <Compile Include="VIPState.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

DesignPattern/State/VIPState.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace State
+{
+    internal class VIPState : State
+    {
+        public VIPState()
+        {
+            this.InterestRate = 15.00M;
+        }
+
+        public override void ChangeScore(Context context, int score)
+        {
+            if (score < 750)
+            {
+                context.CurrentState = new NormalState();
+
+                context.CurrentState.ChangeScore(context, score);
+            }
+        }
+    }
+}