viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/State/ActualState/ActualProject.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.State.ActualState
+{
+    public class ActualProject : IActualProject
+    {
+        public Client? AktuellClient { get; private set; }
+        public Buildingsite? AktuellBaustelle { get; private set; }
+        public Project? AktuellProjekt { get; private set; }
+        public SewerObject? AktuellSewerObject { get; private set; }
+        public SewerDamage? AktuellSewerDamage { get; private set; }
+        public Impregnation? AktuellImpregnation { get; private set;  }
+
+
+        #region events
+        public event EventHandler? ClientChanged;
+        public event EventHandler? ProjectChanged;
+        public event EventHandler? BuildingSiteChanged;
+        public event EventHandler? SewerObjectChanged;
+        public event EventHandler? SewerDamageChanged;
+
+        protected void OnClientChanged()
+        {
+            ClientChanged?.Invoke(this, new EventArgs());
+        }
+        protected void OnProjectChanged()
+        {
+            ProjectChanged?.Invoke(this, new EventArgs());
+        }
+        protected void OnBuildingSiteChanged()
+        {
+            BuildingSiteChanged?.Invoke(this, new EventArgs());
+        }
+        protected void OnSewerObjectChanged()
+        {
+            SewerObjectChanged?.Invoke(this, new EventArgs());
+        }
+        protected void OnSewerDamageChanged()
+        {
+            SewerDamageChanged?.Invoke(this, new EventArgs());
+        }
+        #endregion
+        public void SetClient(Client client, bool notification = true)
+        {
+            //ResetProject();
+            //ResetBuildingSite();
+            AktuellClient = client;
+            if(notification)
+                OnClientChanged();
+        }
+
+        public void SetProject(Project project, bool notification = true)
+        {
+            AktuellProjekt = project;
+            if(notification)
+                OnProjectChanged();
+        }
+
+        public void SetBuildingSite(Buildingsite buildingsite)
+        {
+            AktuellBaustelle = buildingsite;
+            OnBuildingSiteChanged();
+        }
+
+        public void SetSewerObject(SewerObject sewerObject,bool notification = true)
+        {
+            AktuellSewerObject = sewerObject;
+            if(notification)
+                OnSewerObjectChanged();
+        }
+
+        public void SetImpregnation(Impregnation impregnation, bool notification = true)
+        {
+            AktuellImpregnation = impregnation;
+            if (notification)
+                return; // TODO notification wird aktuell nicht benötigt
+        }
+        public void ResetProject()
+        {
+            SetProject(null);
+            ResetBuildingSite();
+        }
+
+        public void ResetBuildingSite()
+        {
+            SetBuildingSite(null);
+        }
+
+        public void SetSewerDamage(SewerDamage sewerDamage, bool notification = true)
+        {
+            AktuellSewerDamage = sewerDamage;
+            if (notification)
+                OnSewerDamageChanged();
+        }
+    }
+}

DaSaSo.Wpf/ViewModel/State/Navigation/MainWindowNavigator.cs

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+using DaSaSo.Wpf.ViewModel.Commands;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class MainWindowNavigator : ObservableObject, IMainWindowNavigator
+    {
+        
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel?.Dispose();
+                _currentViewModel = value;
+                StateChanged?.Invoke();
+            }
+        }
+        public event Action StateChanged;
+    }
+}

DaSaSo.Wpf/ViewModel/State/Navigation/SewerMainNavigator.cs

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+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class SewerMainNavigator : ISewerMainNavigator
+    {
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel?.Dispose();
+                _currentViewModel = value;
+                StateChanged?.Invoke();
+            }
+        }
+        public event Action StateChanged;
+    }
+}

DaSaSo.Wpf/ViewModel/State/Navigation/ViewModelDelegateRenavigator.cs

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+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class ViewModelDelegateRenavigator<TViewModel> : IRenavigator where TViewModel: BaseViewModel
+    {
+        private readonly IMainWindowNavigator _navigator;
+        private readonly CreateViewModel<TViewModel> _createViewModel;
+
+        public ViewModelDelegateRenavigator(IMainWindowNavigator navigator, CreateViewModel<TViewModel> createViewModel)
+        {
+            _navigator = navigator;
+            _createViewModel = createViewModel;
+        }
+
+        public void Renavigate()
+        {
+            _navigator.CurrentViewModel = _createViewModel();
+        }
+    }
+}