MainSoftware/GuiWPF/MainViewModel.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Input;

namespace GuiWPF
{
    public class MainViewModel : ViewModelBase
    {
        public string PageTitle { get; set; }
        public ICommand LoadHomePageCommand {get; private set;}
        public ICommand LoadSettingsPageCommand {get; private set;} 

        private ViewModelBase _currentViewModel;
        public ViewModelBase CurrentViewModel {
            get {
                Trace.WriteLine("CurrentAbgefragt");
                return _currentViewModel;
            }
            set {
                Trace.WriteLine("CurrentView ist geändert worden");
                _currentViewModel = value;
                OnPropertyChanged();
            }
        }

        public MainViewModel()
        {
            PageTitle = "Dichtheitsprüfung by Damian";
            LoadHomePage();
            LoadHomePageCommand = new DelegateCommand(o => this.LoadHomePage());
            LoadSettingsPageCommand = new DelegateCommand(o => this.LoadSettingsPage());
            
            //Initialisieren();
        }

        private void LoadHomePage() {           
           CurrentViewModel = new HomePageViewModel(new HomePage() { PageTitle = "Home"});
        }
        private void LoadSettingsPage() {
            CurrentViewModel = new SettingsPageViewModel();
        }
    }
}