Projektdateien hinzufügen.

BeispielThis/BeispielThis.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

BeispielThis/Program.cs

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+namespace BeispielThis
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Person batman = new Person("Batman");
+            Person robin = new Person("Robin");
+            Console.WriteLine(batman.GetName());
+            Console.WriteLine(robin.GetName());
+            batman.SetPartner(robin);
+            //robin.SetPartner(batman);
+            Console.WriteLine($"Batmans Partner: {batman.GetPartner().GetName()}");
+            Console.WriteLine($"Robins  Partner: {robin.GetPartner().GetName()}");
+        }
+    }
+    class Person
+    {
+        private string name;
+        private Person partner;
+        public Person(string name)
+        {
+            this.name = name;
+        }
+        public string GetName() { return name; }
+        public Person GetPartner() { return partner;}
+        public void SetPartner(Person partner) 
+        { 
+            if (this.partner == null) 
+            {
+                this.partner = partner;
+                this.partner.SetPartner(this);
+            }
+        }
+    }
+}