/// <summary>
        /// 处理打开文档或插入文档
        /// </summary>
        /// <param name="IsInsertFile"></param>
        public void LoadOrInsertFile(bool IsInsertFile, string FileName)
        {
            try
            {
                if (File.Exists(FileName) == false)
                {
                    return;
                }

                string FileExt = System.IO.Path.GetExtension(FileName).ToUpper(); //文件扩展名

                TextRange range = null;
                if (IsInsertFile)
                {
                    range = _rtf.Selection;
                }
                else
                {
                    range = new TextRange(_rtf.Document.ContentStart, _rtf.Document.ContentEnd);
                    //用户输入了些东西
                    if (MySuperEditorHelper.IsPrintableString(range.Text))
                    {
                        MessageBoxResult ret = MessageBox.Show("保存旧文档吗?", "保存文档", MessageBoxButton.YesNo);
                        if (ret == MessageBoxResult.Yes)
                        {
                            SaveToFile(true);
                        }
                    }
                    CurFileName = FileName;
                }
                //打开文件
                using (FileStream fs = new FileStream(FileName, FileMode.Open))
                {
                    switch (FileExt)
                    {
                    case ".XAMLPACKAGE":
                        range.Load(fs, DataFormats.XamlPackage);
                        break;

                    case ".XAML":
                        range.Load(fs, DataFormats.Xaml);
                        break;

                    case ".RTF":
                        range.Load(fs, DataFormats.Rtf);
                        break;

                    case ".TXT":
                    default:
                        //由于TextRange对象不能直接装入Unicode字符,所以,采用其他方法进行处理
                        range.Text = MySuperEditorHelper.LoadStringFromTextFile(fs);
                        break;
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 新建文档
        /// </summary>
        public void NewDocument()
        {
            try
            {
                TextRange range = new TextRange(_rtf.Document.ContentStart, _rtf.Document.ContentEnd);

                if (MySuperEditorHelper.IsPrintableString(range.Text))
                {
                    MessageBoxResult ret = MessageBox.Show("保存旧文档吗?", "保存文档", MessageBoxButton.YesNo);
                    if (ret == MessageBoxResult.Yes)
                    {
                        SaveToFile(true);
                    }
                }

                range.Text  = "";
                CurFileName = "无标题";
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }