Projektdateien hinzufügen.

BeispielAggregation/BeispielAggregation.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

BeispielAggregation/Class.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeispielAggregation
+{
+    internal class Class
+    {
+        private string name;
+        private Student[] students;
+
+        public Class(string name, int cnt)
+        {
+            this.name = name;
+            this.students = new Student[cnt];
+        }
+        public string GetName() { return name; }
+        public void AddStudent(Student student) 
+        {
+            for (int i = 0; i < students.Length; i++)
+            {
+                if (students[i] == null)
+                {
+                    students[i] = student;
+                    student.SetClass(this);
+                    break;
+                }
+            }
+        }
+        public void PrintInfos()
+        {
+            System.Console.WriteLine($"Stundenten in der Klasse {name}:");
+            foreach (Student student in students) 
+            {
+                if (student != null)
+                {
+                    Console.WriteLine(student.GetName());
+                }
+            }
+        }
+    }
+}

BeispielAggregation/Program.cs

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+namespace BeispielAggregation
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Student franzi = new Student("Franzi");
+            Student huihui = new Student("Huhui");
+
+            Class do7 = new Class("Do7", 5);
+
+            do7.AddStudent(franzi);
+            do7.AddStudent(huihui);
+            do7.PrintInfos(); 
+        }
+    }
+}

BeispielAggregation/Student.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeispielAggregation
+{
+    internal class Student
+    {
+        private string name;
+        private Class _class;
+
+        public Student(string name) 
+        {
+            this.name = name;
+        }
+        public string GetName() { return this.name; }
+        public void SetClass(Class _class)
+        {
+            this._class = _class;
+        }
+        public void PrintInfo()
+        {
+            Console.WriteLine($"Der Student {name} ist in der klasse {_class.GetName()}");
+        }
+    }
+
+}