/// <summary>
        /// 合并到一个Excel中
        /// </summary>
        /// <param name="mainFile"></param>
        /// <param name="files"></param>
        /// <param name="v"></param>
        public void MergeIntoMainExcel(string mainFile, string[] subFiles, string posInfoCol, string diffFile = "")
        {
            //建立一个新的 MainFile
            this.Wbk = this.App.Workbooks.Add();
            Excel.Worksheet mainSht = this.Wbk.ActiveSheet;

            Excel.Workbook  diffWbk = null;
            Excel.Worksheet diffSht = null;
            if (diffFile != "")
            {
                diffWbk = App.Workbooks.Add();
                diffSht = diffWbk.ActiveSheet;
            }

            List <CellSegment_Ex> segList = new List <CellSegment_Ex>();

            //遍历子文件获取信息并写入到mainsht中
            string mainPath = Path.GetDirectoryName(mainFile);

            foreach (string subFile in subFiles)
            {
                string relativePath = subFile.Replace(mainPath, "..");
                ShowStatus(string.Format("正在抽取文件:{0}...", relativePath));
                segList.AddRange(ExctractContentInfoByWorkBook(subFile, relativePath, false, diffSht, posInfoCol));
            }

            //写入到主表单
            ShowStatus("正在写入数据...");
            WriteToMainSht(mainSht, segList, posInfoCol);

            //隐藏位置信息列
            mainSht.Range[posInfoCol + ":" + posInfoCol].ColumnWidth = 0;
            if (diffFile != "")
            {
                //删除第一行 因为第一行是空
                diffSht.Range["1:1"].EntireRow.Delete(Excel.XlDeleteShiftDirection.xlShiftUp);
                diffSht.Range[posInfoCol + ":" + posInfoCol].ColumnWidth = 0;
                diffWbk.Title = "DifferentFont";
                diffWbk.SaveAs(diffFile);
                //关闭
                diffWbk.Close(Excel.XlSaveAction.xlDoNotSaveChanges);
            }
            this.Wbk.Title = "Merged";
            this.Wbk.SaveAs(mainFile);
            //关闭
            Wbk.Close(Excel.XlSaveAction.xlDoNotSaveChanges);

            ShowStatus("合并完成");
        }
 /// <summary>
 /// 无保存关闭 文档
 /// </summary>
 public void CloseWbk()
 {
     Wbk.Close(Excel.XlSaveAction.xlDoNotSaveChanges);
 }