c# 기초구문 업데이트 완료

ExR.Delegate2/ExR.Delegate2.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExR.Delegate2/Program.cs

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+using System;
+
+class MyClass
+{
+    // 1. delegate 선언
+    private delegate void RunDelegate(int i);
+
+    private void RunThis(int val)
+    {
+        // 콘솔출력 : 1024
+        Console.WriteLine("{0}", val);
+    }
+
+    private void RunThat(int value)
+    {
+        // 콘솔출력 : 0x400
+        Console.WriteLine("0x{0:X}", value);
+    }
+
+    public void Perform()
+    {
+        // 2. delegate 인스턴스 생성
+        RunDelegate run = new RunDelegate(RunThis);
+        // 3. delegate 실행
+        run(1024);
+
+        //run = new RunDelegate(RunThat); 을 줄여서 
+        //아래와 같이 쓸 수 있다.
+        run = RunThat;
+
+        run(1024);
+    }
+
+    public void PerformMultiCast(int val)
+    {
+        RunDelegate run = RunThis;
+        run += RunThat;
+        run(val);
+    }
+}
+
+class MySort
+{
+    // 델리게이트 CompareDelegate 선언
+    public delegate int CompareDelegate(int i1, int i2);
+
+    public static void Sort(int[] arr, CompareDelegate comp)
+    {
+        if (arr.Length < 2) return;
+        Console.WriteLine("함수 Prototype: " + comp.Method);
+
+        int ret;
+        for (int i = 0; i < arr.Length - 1; i++)
+        {
+            for (int j = i + 1; j < arr.Length; j++)
+            {
+                ret = comp(arr[i], arr[j]);
+                if (ret == -1)
+                {
+                    // 교환
+                    int tmp = arr[j];
+                    arr[j] = arr[i];
+                    arr[i] = tmp;
+                }
+            }
+        }
+        Display(arr);
+    }
+    static void Display(int[] arr)
+    {
+        foreach (var i in arr) Console.Write(i + " ");
+        Console.WriteLine();
+    }
+}
+
+internal class Program
+{
+
+    private static void Main(string[] args)
+    {
+        MyClass mc = new MyClass();
+        mc.Perform();
+
+        (new Program()).Run();
+    }
+
+    void Run()
+    {
+        int[] a = { 5, 53, 3, 7, 1 };
+
+        // 올림차순으로 소트
+        MySort.CompareDelegate compDelegate = AscendingCompare;
+        MySort.Sort(a, compDelegate);
+
+        // 내림차순으로 소트
+        compDelegate = DescendingCompare;
+        MySort.Sort(a, compDelegate);
+    }
+
+    // CompareDelegate 델리게이트와 동일한 Prototype
+    int AscendingCompare(int i1, int i2)
+    {
+        if (i1 == i2) return 0;
+        return (i2 - i1) > 0 ? 1 : -1;
+    }
+
+    // CompareDelegate 델리게이트와 동일한 Prototype
+    int DescendingCompare(int i1, int i2)
+    {
+        if (i1 == i2) return 0;
+        return (i1 - i2) > 0 ? 1 : -1;
+    }
+}