PDFOffice_Windows_exe/PDF Office/ViewModels/MainWindowViewModel.cs

using PDF_Office.EventAggregators;
using PDF_Office.Views;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PDF_Office.ViewModels
{
    public class MainWindowViewModel:BindableBase
    {
        private string _title = "PDF Office";
        public string Title
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }

        public IRegionManager region;

        public IEventAggregator eventer;

        public MainWindowViewModel(IRegionManager regionManager, IEventAggregator eventAggregator)
        {
            region = regionManager;
            eventer = eventAggregator;
            //region.RequestNavigate("ViwerRegion", "HomeContent");
            eventer.GetEvent<OpenFileEvent>().Subscribe(OpenFile);
            region.RegisterViewWithRegion("ViwerRegion",typeof(HomeContent));
        }

        public void OpenFile()
        {
            region.RequestNavigate("ViwerRegion", "ViewContent");
        }
    }
}