linq

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "dotnet.defaultSolution": "AdvancedC#Grammer/MySolution/MySolution.sln"
+}

AdvancedC#Grammer/MySolution/MyConsoleApp/MyConsoleApp.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

AdvancedC#Grammer/MySolution/MyConsoleApp/Program.cs

@@ -0,0 +1,19 @@
+using MyConsoleApp.Work;
+
+namespace MyConsoleApp;
+class Program
+{
+    
+
+    static void Main(string[] args)
+    {
+        //AsyncAwaitWork.DoTest();
+
+        LinqWork.DoTest();
+
+        while (true)
+        {
+
+        }
+    }
+}

AdvancedC#Grammer/MySolution/MyConsoleApp/Work/AsyncAwaitWork.cs

@@ -0,0 +1,47 @@
+namespace MyConsoleApp.Work
+{
+    public class AsyncAwaitWork
+    {
+        private static Task Test()
+        {
+            System.Console.WriteLine("Start Test");
+            Task t = Task.Delay(3000);
+            return t;
+        }
+
+        private static async void TestAsync()
+        {
+            System.Console.WriteLine("Start Test");
+            Task t = Task.Delay(3000);
+            await t; // 함수 내부에서는 동기, 함수 호출부에서는 비동기로 처리됨
+            System.Console.WriteLine("End TestAsync");
+        }
+
+        private static async Task<int> TestAsync2()
+        {
+            System.Console.WriteLine("Start Test");
+            Task t = Task.Delay(3000);
+            await t; 
+            System.Console.WriteLine("End TestAsync");
+
+            return 1;
+        }
+
+        public async static void DoTest()
+        {
+            // Task t = Test();
+            // t.Wait();
+
+            //TestAsync();
+            await TestAsync2(); // 메인 함수도 동기로 처리됨
+
+            int res = await TestAsync2();
+
+            System.Console.WriteLine("While start");
+            while (true)
+            {
+
+            }
+        }
+    }
+}

AdvancedC#Grammer/MySolution/MyConsoleApp/Work/LinqWork.cs

@@ -0,0 +1,160 @@
+using System.Diagnostics;
+using System.Security.Cryptography;
+
+namespace MyConsoleApp.Work
+{
+    public class LinqWork
+    {
+        private static List<Player> _players = new List<Player>();
+
+        private static void InitInstance()
+        {
+            Random rand = new Random();
+            for (int i = 0; i < 100; i++)
+            {
+                ClassType type = ClassType.Knight;
+                switch (rand.Next(0, 3))
+                {
+                    case 1:
+                        type = ClassType.Archer;
+                        break;
+                    case 2:
+                        type = ClassType.Mage;
+                        break;
+                }
+
+                Player player = new Player()
+                {
+                    ClassType = type,
+                    Level = rand.Next(1, 100),
+                    Hp = rand.Next(100, 1000),
+                    Attack = rand.Next(5, 50)
+                };
+
+                for (int j = 0; j < 5; j++)
+                {
+                    player.Items.Add(rand.Next(1, 100));
+                }
+
+                _players.Add(player);
+            }
+        }
+
+        public static void DoTest()
+        {
+            InitInstance();
+
+            // Q1) 레벨 50 이상인 Knight를 레벨 오름차순으로 정렬
+
+            Stopwatch sw = new Stopwatch();
+            sw.Start();
+            // Without Linq
+            {
+                List<Player> players = GetHighLevelKnight();
+                foreach (Player player in players)
+                {
+                    System.Console.WriteLine($"[{player.Level}] {player.Hp}");
+                }
+            }
+            System.Console.WriteLine($"{sw.ElapsedMilliseconds}ms");
+
+            System.Console.WriteLine("---------------------");
+
+            sw.Restart();
+            // With Linq
+            {
+                var players = 
+                    from p in _players
+                    where p.ClassType == ClassType.Knight && p.Level >= 50
+                    orderby p.Level
+                    select p;
+
+                foreach (Player player in players)
+                {
+                    System.Console.WriteLine($"[{player.Level}] {player.Hp}");
+                }
+            }
+            System.Console.WriteLine($"{sw.ElapsedMilliseconds}ms");
+
+            // from 중첩
+            // Q2) id가 30 미만인 모든 아이템 목록 추출
+            {
+                var playerItems =
+                    from p in _players
+                    from i in p.Items
+                    where i < 30
+                    select new { p, i };
+                
+                var li = playerItems.ToList();
+                System.Console.WriteLine($"Count: {li.Count}");
+            }
+
+            // grouping
+            {
+                var playerByLevel =
+                    from p in _players
+                    group p by p.Level into g
+                    orderby g.Key
+                    select new { g.Key, Players = g };
+            }
+
+            // join
+            {
+                List<int> levels = new List<int>() { 1, 5, 10 };
+                var players = 
+                    from p in _players
+                    join l in levels
+                    on p.Level equals l
+                    select p;
+            }
+
+            // Linq 표준 연산자
+            {
+                var players = 
+                    from p in _players
+                    where p.ClassType == ClassType.Knight && p.Level >= 50
+                    orderby p.Level
+                    select p;
+
+                var players2 = _players
+                    .Where(p => p.ClassType == ClassType.Knight && p.Level >= 50)
+                    .OrderBy(p => p.Level)
+                    .Select(p => p);
+            }
+        }
+
+        private static List<Player> GetHighLevelKnight()
+        {
+            List<Player> players = new List<Player>();
+            foreach (Player player in _players)
+            {
+                if (player.ClassType != ClassType.Knight)
+                    continue;
+                if (player.Level < 50)
+                    continue;
+
+                players.Add(player);
+            }
+
+            players.Sort((lhs, rhs) => { return lhs.Level - rhs.Level; });
+
+            return players;
+        }
+    }
+
+    public enum ClassType
+    {
+        Knight,
+        Archer,
+        Mage,
+    }
+
+    public class Player
+    {
+        public ClassType ClassType { get; set; }
+        public int Level { get; set; }
+        public int Hp { get; set; }
+        public int Attack { get; set; }
+        public List<int> Items { get; set; } = new List<int>();
+    }
+}

AdvancedC#Grammer/MySolution/MySolution.sln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MyConsoleApp", "MyConsoleApp\MyConsoleApp.csproj", "{4904D5DC-9923-40EE-9550-E99B74754381}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4904D5DC-9923-40EE-9550-E99B74754381}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4904D5DC-9923-40EE-9550-E99B74754381}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4904D5DC-9923-40EE-9550-E99B74754381}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4904D5DC-9923-40EE-9550-E99B74754381}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

HTML, CSS/test.html

@@ -19,6 +19,25 @@
       td {
         border: 1px solid salmon;
       }
+      #para1 {
+        color: red;
+        font-weight: bold;
+        text-align: center;
+      }
+      .center {
+        text-align: center;
+      }
+      div {
+        background-color: lightblue;
+        width: 300px;
+        border: 15px solid green;
+        padding: 50px;
+        margin: 20px;
+      }
+      h1 {
+        border-bottom: 1px solid gray;
+        padding-bottom: 15px;
+      }
     </style>
   </head>
 
@@ -30,12 +49,15 @@
     <strong>enim ad minim veniam,</strong>
     quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
     consequat.<br />
-    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore
+    <span style="color: blueviolet; font-weight: bold">aute irure dolor</span>
-    eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident,
+    in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
-    sunt in culpa qui officia deserunt mollit anim id est laborum.
+    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+    officia deserunt mollit anim id est laborum.
 
     <p>This is paragraph.</p>
+    <p id="para1">This is paragraph.</p>
     <p>This is paragraph.</p>
+    <p class="center">This is paragraph.</p>
     <p>This is paragraph.</p>
 
     <img
@@ -121,6 +143,16 @@
       <input type="submit" value="Submit" />
     </form>
 
+    <div>
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
+      tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+      veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
+      commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
+      velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
+      cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id
+      est laborum.
+    </div>
+
     <script>
       function testFunc() {
         alert('Call testFunc!');