PDFOffice_Windows_exe/PDF Office/ViewModels/ViewContentViewModel.cs

using Microsoft.Win32;
using Prism.Commands;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ComPDFKitViewer.PdfViewer;
using Prism.Regions;

namespace PDF_Office.ViewModels
{

    public class ViewContentViewModel : BindableBase
    {
        public DelegateCommand LoadFile { get; set; }

        private CPDFViewer PDFViewer { get; set; }

        public IRegionManager region;

        public ViewContentViewModel(IRegionManager regionManager)
        {
            LoadFile = new DelegateCommand(loadFile);
            region = regionManager;
            //在构造函数中使用Region需要借助Dispatcher 确保UI已经加载完成
            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() => { loadFile(); }));


        }

        private void loadFile()
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "PDF Files (*.pdf)|*.pdf";
            if ((bool)openFileDialog.ShowDialog())
            {
                string file = openFileDialog.FileName;
                var PDFViewer = new CPDFViewer();
                PDFViewer.InitDocument(file);
                PDFViewer.Load();
                region.AddToRegion("PDFViewer", PDFViewer);
            }

        }

    }
}