LunarMind/Commands/OpenDocument.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using Microsoft.Win32;
using System.Windows;
using System.Xml;
using System.IO;

namespace SHomeWorkshop.LunarMind.Commands
{
    /// <summary>
    /// 打开文档命令。此命令总是可以运行的。
    /// </summary>
    public static class OpenDocumentCommand
    {
        private static RoutedUICommand routedUICmd;//创建私有字段

        public static RoutedUICommand RoutedUICmd//创建只读静态属性
        {
            get { return routedUICmd; }
        }

        static OpenDocumentCommand()//类型构造器
        {
            routedUICmd = new RoutedUICommand(
                "OpenDocumentCommand",
                "OpenDocumentCommand",
                typeof(OpenDocumentCommand),//创建RoutedUICommand对象
                null);

            //未知原因的故障，可能与焦点有关。改由MainWindows_PreviewKeyDown事件实现。
            //new InputGestureCollection() 
            //    { 
            //        new KeyGesture(Key.O,ModifierKeys.Control,"Ctrl+O")
            //    }

            cmdBinding.Command = routedUICmd;
            cmdBinding.CanExecute += new CanExecuteRoutedEventHandler(cmdBinding_CanExecute);
            cmdBinding.Executed += new ExecutedRoutedEventHandler(cmdBinding_Executed);
        }

        private static CommandBinding cmdBinding = new CommandBinding();

        public static CommandBinding CmdBinding
        {
            get { return cmdBinding; }
        }

        static void cmdBinding_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            OpenDocument();
        }

        internal static void OpenDocument()
        {
            if (Globals.MainWindow.IsModified)
            {
                MessageBoxResult result = MessageBox.Show("当前文档已被修改，是否需要保存？",