C# 文本编辑器（仿记事本notepad）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 多文档编辑器
{
    public partial class DocForm : Form
    {
        DocForm doc;

        public RichTextBox Sourse
        {
            get
            {
                return richTextBox;
            }
            set
            {
                richTextBox = value;
            }
        }


        private string _filePath = string.Empty;
        private int _index;

        public int GetFileTypeIndex（）
        {
            return _index;
        }
        public void SetFileTypeIndex（int i）
        {
            _index = i;
 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2016-12-26 09:54  Editor\
     目录           0  2016-12-26 09:54  Editor\Editor\
     文件         860  2016-12-25 01:42  Editor\Editor.sln
     文件       25088  2016-12-26 10:12  Editor\Editor.suo
     文件         187  2013-05-16 12:05  Editor\Editor\App.config
     目录           0  2016-12-26 09:54  Editor\Editor\bin\
     目录           0  2016-12-26 09:54  Editor\Editor\bin\Debug\
     文件       33280  2016-12-25 11:26  Editor\Editor\bin\Debug\Editor.exe
     文件       71168  2016-12-25 11:26  Editor\Editor\bin\Debug\Editor.pdb
     文件       11600  2016-12-26 10:12  Editor\Editor\bin\Debug\Editor.vshost.exe
     文件         490  2010-03-17 22:39  Editor\Editor\bin\Debug\Editor.vshost.exe.manifest
     目录           0  2016-12-25 01:44  Editor\Editor\bin\Release\
     文件        1547  2016-12-25 10:44  Editor\Editor\DocForm.cs
     文件        2267  2016-12-25 10:44  Editor\Editor\DocForm.Designer.cs
     文件        5990  2016-12-25 10:44  Editor\Editor\DocForm.resx
     文件        4643  2016-12-25 01:44  Editor\Editor\Editor.csproj
     文件        2976  2016-12-25 11:26  Editor\Editor\FindForm.cs
     文件        7419  2013-05-17 20:57  Editor\Editor\FindForm.Designer.cs
     文件        5817  2013-05-17 20:57  Editor\Editor\FindForm.resx
     文件       19307  2016-12-25 11:26  Editor\Editor\MainForm.cs
     文件       28753  2016-12-25 11:26  Editor\Editor\MainForm.Designer.cs
     文件        7233  2016-12-25 11:26  Editor\Editor\MainForm.resx
     目录           0  2016-12-26 09:54  Editor\Editor\obj\
     目录           0  2016-12-26 09:54  Editor\Editor\obj\x86\
     目录           0  2016-12-26 09:54  Editor\Editor\obj\x86\Debug\
     文件        4440  2016-12-25 01:49  Editor\Editor\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6181  2016-12-26 10:11  Editor\Editor\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        1024  2016-12-26 10:12  Editor\Editor\obj\x86\Debug\Editor.csproj.FileListAbsolute.txt
     文件       33280  2016-12-25 11:26  Editor\Editor\obj\x86\Debug\Editor.exe
     文件       71168  2016-12-25 11:26  Editor\Editor\obj\x86\Debug\Editor.pdb
     文件         180  2016-12-25 01:44  Editor\Editor\obj\x86\Debug\Editor.Properties.Resources.resources
............此处省略18个文件信息