完善功能

电子展板/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Forms;
+using System.Windows.Media;
+using 电子展板.Base;
+
+namespace 电子展板.ViewModels
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+        private Window window;
+        public DelegateCommand<Window> LoadedCommand { get; set; }
+        public DelegateCommand<CancelEventArgs> WindowClosingCommand { get; set; }
+        public MainWindowViewModel()
+        {
+            LoadedCommand = new DelegateCommand<Window>(Loaded);
+            WindowClosingCommand = new DelegateCommand<CancelEventArgs>(WindowClosing);
+        }
+
+        private void Loaded(Window window)
+        {
+            this.window = window;
+            int screenIndex = 0;
+            this.window.Left = (int)(Screen.AllScreens[screenIndex].Bounds.Left / GetDpiScaleX());
+            this.window.Top = (int)(Screen.AllScreens[screenIndex].Bounds.Top / GetDpiScaleX());
+            this.window.Width = (int)(Screen.AllScreens[screenIndex].Bounds.Width / GetDpiScaleX());
+            this.window.Height = (int)(Screen.AllScreens[screenIndex].Bounds.Height / GetDpiScaleX());
+            WebServer.Start();
+        }
+
+        private void WindowClosing(CancelEventArgs args)
+        {
+            WebServer.Stop();
+            Environment.Exit(0);
+        }
+        public double GetDpiScaleX()
+        {
+            return VisualTreeHelper.GetDpi(this.window).DpiScaleX;
+        }
+    }
+}