3rd Rewrite of everything

Completly rewrote the project from scratch

Superbuchhaltungv3/Konto.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+using System.Windows.Documents;
+
+
+namespace Superbuchhaltungv3
+{
+    public class Konto
+    {
+        public bool Aktiv { get; set; }
+        public string KontoNummer { get; set; }
+        public string KontoName { get; set; }
+        public float Wert { get; set; }
+
+        [JsonInclude]
+        public string Id { get; private set; }
+        [JsonInclude]
+        public List<Buchung> Buchungen { get; private set; } = new List<Buchung>();
+
+        public Konto(bool aktiv, string kontoName, string kontoNummer)
+        {
+            Aktiv = aktiv;
+            KontoName = kontoName;
+            KontoNummer = kontoNummer;
+            Id = DateTime.Now.Ticks.ToString() + "-" + Guid.NewGuid().ToString();
+        }
+
+        public void AddBuchung(float wert, string gegenKonto)
+        {
+            Buchungen.Add(new Buchung(wert, gegenKonto));
+            NewMethod(wert);
+
+            void NewMethod(float wert)
+            {
+                Wert += wert;
+            }
+        }
+
+        public void RemoveBuchung(int index)
+        {
+            Wert -= Buchungen[index].Wert;
+            Buchungen.RemoveAt(index);
+        }
+        public void ClearBuchungen()
+        {
+            Wert = 0.0f;
+            Buchungen.Clear();
+        }
+    }
+}