C#获取指定目录下的指定文件

ExecutionResult result = new ExecutionResult();
 result.Status = true;
 string strLocalPath = System.Windows.Forms.Application.StartupPath + "\\ExcelTemplate\\";
 if (Directory.Exists(strLocalPath))
 {
 foreach (string GCFile in Directory.GetFiles(strLocalPath, "temp.xlsx", SearchOption.TopDirectoryOnly))
    {
   string fileName = Path.GetFileName(GCFile);
   string filename = Path.GetFileName(GCFile).Replace(".xlsx", "") + DateTime.Now.ToString("_yyyyMMdd") + ".xlsx";
        try
         {
        File.Copy(strLocalPath + fileName, strLocalPath + "Temp\\" + filename, true);
        result = GetA31DayData(strLocalPath + "Temp\\" + filename);
         }
      catch (Exception ex)
          {
         result.Status = false;
         result.Message = "copy file to destination file exception. Msg:" + ex.Message;
         result.Anything = ex.Message;
   if (mesLog.IsErrorEnabled)
   {
 mesLog.Error(ex.StackTrace);
    }
        }
           }
     }
  else
 {
 result.Status = false;
 result.Message = "Directory not exists!";
  }
    return result;