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ExI.Event/ExI.Event.csproj

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

ExI.Event/MyClass.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExI.Event
+{
+    class MyClass
+    {
+        public event EventHandler<EventArgs>? Complished;
+        
+        public void Calc(int complexity)
+        {
+            Thread.Sleep(complexity);
+            Complished?.Invoke(this, EventArgs.Empty);
+        }
+    }
+}

ExI.Event/Program.cs

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+// See https://aka.ms/new-console-template for more information
+using ExI.Event;
+
+var mycls = new MyClass();
+mycls.Complished += Mycls_Complished;
+
+void Mycls_Complished(object? sender, EventArgs e)
+{
+    Console.WriteLine("작업끝");
+}
+
+mycls.Calc(2000);