/// <summary>
/// 從Excel2003取數(shù)據(jù)并記錄到List集合里
/// </summary>
/// <param name="cellHeard">單元頭的Key和Value：{ { "UserName", "姓名" }, { "Age", "年齡" } };</param>
/// <param name="filePath">保存文件絕對(duì)路徑</param>
/// <param name="errorMsg">錯(cuò)誤信息</param>
/// <returns>轉(zhuǎn)換好的List對(duì)象集合</returns>
private static List<T> Excel2003ToEntityList<T>(Dictionary<string, string> cellHeard, string filePath, out StringBuilder errorMsg) where T : new()
{
 errorMsg = new StringBuilder(); // 錯(cuò)誤信息,Excel轉(zhuǎn)換到實(shí)體對(duì)象時(shí)，會(huì)有格式的錯(cuò)誤信息
 List<T> enlist = new List<T>(); // 轉(zhuǎn)換后的集合
 List<string> keys = cellHeard.Keys.ToList(); // 要賦值的實(shí)體對(duì)象屬性名稱
 try
 {
 using (FileStream fs = File.OpenRead(filePath))
 {
  HSSFWorkbook workbook = new HSSFWorkbook(fs);
  HSSFSheet sheet = (HSSFSheet)workbook.GetSheetAt(0); // 獲取此文件第一個(gè)Sheet頁
  for (int i = 1; i <= sheet.LastRowNum; i++) // 從1開始，第0行為單元頭
  {
  // 1.判斷當(dāng)前行是否空行，若空行就不在進(jìn)行讀取下一行操作，結(jié)束Excel讀取操作
  if (sheet.GetRow(i) == null)
  {
   break;
  }
 
  T en = new T();
  string errStr = ""; // 當(dāng)前行轉(zhuǎn)換時(shí)，是否有錯(cuò)誤信息，格式為：第1行數(shù)據(jù)轉(zhuǎn)換異常：XXX列；
  for (int j = 0; j < keys.Count; j++)
  {
   // 2.若屬性頭的名稱包含'.',就表示是子類里的屬性，那么就要遍歷子類，eg：UserEn.TrueName
   if (keys[j].IndexOf(".") >= 0)
   {
   // 2.1解析子類屬性
   string[] properotyArray = keys[j].Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries);
   string subClassName = properotyArray[0]; // '.'前面的為子類的名稱
   string subClassProperotyName = properotyArray[1]; // '.'后面的為子類的屬性名稱
   System.Reflection.PropertyInfo subClassInfo = en.GetType().GetProperty(subClassName); // 獲取子類的類型
   if (subClassInfo != null)
   {
    // 2.1.1 獲取子類的實(shí)例
    var subClassEn = en.GetType().GetProperty(subClassName).GetValue(en, null);
    // 2.1.2 根據(jù)屬性名稱獲取子類里的屬性信息
    System.Reflection.PropertyInfo properotyInfo = subClassInfo.PropertyType.GetProperty(subClassProperotyName);
    if (properotyInfo != null)
    {
    try
    {
     // Excel單元格的值轉(zhuǎn)換為對(duì)象屬性的值，若類型不對(duì)，記錄出錯(cuò)信息
     properotyInfo.SetValue(subClassEn, GetExcelCellToProperty(properotyInfo.PropertyType, sheet.GetRow(i).GetCell(j)), null);
    }
    catch (Exception e)
    {
     if (errStr.Length == 0)
     {
     errStr = "第" + i + "行數(shù)據(jù)轉(zhuǎn)換異常：";
     }
     errStr += cellHeard[keys[j]] + "列；";
    }
     
    }
   }
   }
   else
   {
   // 3.給指定的屬性賦值
   System.Reflection.PropertyInfo properotyInfo = en.GetType().GetProperty(keys[j]);
   if (properotyInfo != null)
   {
    try
    {
    // Excel單元格的值轉(zhuǎn)換為對(duì)象屬性的值，若類型不對(duì)，記錄出錯(cuò)信息
    properotyInfo.SetValue(en, GetExcelCellToProperty(properotyInfo.PropertyType, sheet.GetRow(i).GetCell(j)), null);
    }
    catch (Exception e)
    {
    if (errStr.Length == 0)
    {
     errStr = "第" + i + "行數(shù)據(jù)轉(zhuǎn)換異常：";
    }
    errStr += cellHeard[keys[j]] + "列；";
    }
   }
   }
  }
  // 若有錯(cuò)誤信息，就添加到錯(cuò)誤信息里
  if (errStr.Length > 0)
  {
   errorMsg.AppendLine(errStr);
  }
  enlist.Add(en);
  }
 }
 return enlist;
 }
 catch (Exception ex)
 {
 throw ex;
 }
}
 

public void ImportExcel(HttpContext context)
{
 StringBuilder errorMsg = new StringBuilder(); // 錯(cuò)誤信息
 try
 {
 
 #region 1.獲取Excel文件并轉(zhuǎn)換為一個(gè)List集合
 
 // 1.1存放Excel文件到本地服務(wù)器
 HttpPostedFile filePost = context.Request.Files["filed"]; // 獲取上傳的文件
 string filePath = ExcelHelper.SaveExcelFile(filePost); // 保存文件并獲取文件路徑
 
 // 單元格抬頭
 // key：實(shí)體對(duì)象屬性名稱，可通過反射獲取值
 // value：屬性對(duì)應(yīng)的中文注解
 Dictionary<string, string> cellheader = new Dictionary<string, string> {
  { "Name", "姓名" },
  { "Age", "年齡" },
  { "GenderName", "性別" },
  { "TranscriptsEn.ChineseScores", "語文成績(jī)" },
  { "TranscriptsEn.MathScores", "數(shù)學(xué)成績(jī)" },
 };
 
 // 1.2解析文件，存放到一個(gè)List集合里
 List<UserEntity> enlist = ExcelHelper.ExcelToEntityList<UserEntity>(cellheader, filePath, out errorMsg);
 
 #endregion
 
 #region 2.對(duì)List集合進(jìn)行有效性校驗(yàn)
 
 #region 2.1檢測(cè)必填項(xiàng)是否必填
 
 for (int i = 0; i < enlist.Count; i++)
 {
  UserEntity en = enlist[i];
  string errorMsgStr = "第" + (i + 1) + "行數(shù)據(jù)檢測(cè)異常：";
  bool isHaveNoInputValue = false; // 是否含有未輸入項(xiàng)
  if (string.IsNullOrEmpty(en.Name))
  {
  errorMsgStr += "姓名列不能為空；";
  isHaveNoInputValue = true;
  }
  if (isHaveNoInputValue) // 若必填項(xiàng)有值未填
  {
  en.IsExcelVaildateOK = false;
  errorMsg.AppendLine(errorMsgStr);
  }
 }
 
 #endregion
 
 #region 2.2檢測(cè)Excel中是否有重復(fù)對(duì)象
 
 for (int i = 0; i < enlist.Count; i++)
 {
  UserEntity enA = enlist[i];
  if (enA.IsExcelVaildateOK == false) // 上面驗(yàn)證不通過，不進(jìn)行此步驗(yàn)證
  {
  continue;
  }
 
  for (int j = i + 1; j < enlist.Count; j++)
  {
  UserEntity enB = enlist[j];
  // 判斷必填列是否全部重復(fù)
  if (enA.Name == enB.Name)
  {
   enA.IsExcelVaildateOK = false;
   enB.IsExcelVaildateOK = false;
   errorMsg.AppendLine("第" + (i + 1) + "行與第" + (j + 1) + "行的必填列重復(fù)了");
  }
  }
 }
 
 #endregion
 
 // TODO：其他檢測(cè)
 
 #endregion
 
 // 3.TODO：對(duì)List集合持久化存儲(chǔ)操作。如：存儲(chǔ)到數(shù)據(jù)庫
  
 // 4.返回操作結(jié)果
 bool isSuccess = false;
 if (errorMsg.Length == 0)
 {
  isSuccess = true; // 若錯(cuò)誤信息成都為空，表示無錯(cuò)誤信息
 }
 var rs = new { success = isSuccess, msg = errorMsg.ToString(), data = enlist };
 System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
 context.Response.ContentType = "text/plain";
 context.Response.Write(js.Serialize(rs)); // 返回Json格式的內(nèi)容
 }
 catch (Exception ex)
 {
　　 　　throw ex;
 }
}
　　

/// <summary>
/// 實(shí)體類集合導(dǎo)出到Excle2003
/// </summary>
/// <param name="cellHeard">單元頭的Key和Value：{ { "UserName", "姓名" }, { "Age", "年齡" } };</param>
/// <param name="enList">數(shù)據(jù)源</param>
/// <param name="sheetName">工作表名稱</param>
/// <returns>文件的下載地址</returns>
public static string EntityListToExcel2003(Dictionary<string, string> cellHeard, IList enList, string sheetName)
{
 try
 {
 string fileName = sheetName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls"; // 文件名稱
 string urlPath = "UpFiles/ExcelFiles/" + fileName; // 文件下載的URL地址，供給前臺(tái)下載
 string filePath = HttpContext.Current.Server.MapPath("\\" + urlPath); // 文件路徑
 
 // 1.檢測(cè)是否存在文件夾，若不存在就建立個(gè)文件夾
 string directoryName = Path.GetDirectoryName(filePath);
 if (!Directory.Exists(directoryName))
 {
  Directory.CreateDirectory(directoryName);
 }
 
 // 2.解析單元格頭部，設(shè)置單元頭的中文名稱
 HSSFWorkbook workbook = new HSSFWorkbook(); // 工作簿
 ISheet sheet = workbook.CreateSheet(sheetName); // 工作表
 IRow row = sheet.CreateRow(0);
 List<string> keys = cellHeard.Keys.ToList();
 for (int i = 0; i < keys.Count; i++)
 {
  row.CreateCell(i).SetCellValue(cellHeard[keys[i]]); // 列名為Key的值
 }
 
 // 3.List對(duì)象的值賦值到Excel的單元格里
 int rowIndex = 1; // 從第二行開始賦值(第一行已設(shè)置為單元頭)
 foreach (var en in enList)
 {
  IRow rowTmp = sheet.CreateRow(rowIndex);
  for (int i = 0; i < keys.Count; i++) // 根據(jù)指定的屬性名稱，獲取對(duì)象指定屬性的值
  {
  string cellValue = ""; // 單元格的值
  object properotyValue = null; // 屬性的值
  System.Reflection.PropertyInfo properotyInfo = null; // 屬性的信息
 
  // 3.1 若屬性頭的名稱包含'.',就表示是子類里的屬性，那么就要遍歷子類，eg：UserEn.UserName
  if (keys[i].IndexOf(".") >= 0)
  {
   // 3.1.1 解析子類屬性(這里只解析1層子類，多層子類未處理)
   string[] properotyArray = keys[i].Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries);
   string subClassName = properotyArray[0]; // '.'前面的為子類的名稱
   string subClassProperotyName = properotyArray[1]; // '.'后面的為子類的屬性名稱
   System.Reflection.PropertyInfo subClassInfo = en.GetType().GetProperty(subClassName); // 獲取子類的類型
   if (subClassInfo != null)
   {
   // 3.1.2 獲取子類的實(shí)例
   var subClassEn = en.GetType().GetProperty(subClassName).GetValue(en, null);
   // 3.1.3 根據(jù)屬性名稱獲取子類里的屬性類型
   properotyInfo = subClassInfo.PropertyType.GetProperty(subClassProperotyName);
   if (properotyInfo != null)
   {
    properotyValue = properotyInfo.GetValue(subClassEn, null); // 獲取子類屬性的值
   }
   }
  }
  else
  {
   // 3.2 若不是子類的屬性，直接根據(jù)屬性名稱獲取對(duì)象對(duì)應(yīng)的屬性
   properotyInfo = en.GetType().GetProperty(keys[i]);
   if (properotyInfo != null)
   {
   properotyValue = properotyInfo.GetValue(en, null);
   }
  }
 
  // 3.3 屬性值經(jīng)過轉(zhuǎn)換賦值給單元格值
  if (properotyValue != null)
  {
   cellValue = properotyValue.ToString();
   // 3.3.1 對(duì)時(shí)間初始值賦值為空
   if (cellValue.Trim() == "0001/1/1 0:00:00" || cellValue.Trim() == "0001/1/1 23:59:59")
   {
   cellValue = "";
   }
  }
 
  // 3.4 填充到Excel的單元格里
  rowTmp.CreateCell(i).SetCellValue(cellValue);
  }
  rowIndex++;
 }
 
 // 4.生成文件
 FileStream file = new FileStream(filePath, FileMode.Create);
 workbook.Write(file);
 file.Close();
 
 // 5.返回下載路徑
 return urlPath;
 }
 catch (Exception ex)
 {
 throw ex;
 }
}
 

public void ExportExcel(HttpContext context)
{
 try
 {
 // 1.獲取數(shù)據(jù)集合
 List<UserEntity> enlist = new List<UserEntity>() {
  new UserEntity{Name="劉一",Age=22,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=80,MathScores=90}},
  new UserEntity{Name="陳二",Age=23,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=81,MathScores=91} },
  new UserEntity{Name="張三",Age=24,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=82,MathScores=92} },
  new UserEntity{Name="李四",Age=25,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=83,MathScores=93} },
  new UserEntity{Name="王五",Age=26,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=84,MathScores=94} },
 };
 
 // 2.設(shè)置單元格抬頭
 // key：實(shí)體對(duì)象屬性名稱，可通過反射獲取值
 // value：Excel列的名稱
 Dictionary<string, string> cellheader = new Dictionary<string, string> {
  { "Name", "姓名" },
  { "Age", "年齡" },
  { "GenderName", "性別" },
  { "TranscriptsEn.ChineseScores", "語文成績(jī)" },
  { "TranscriptsEn.MathScores", "數(shù)學(xué)成績(jī)" },
 };
 
 // 3.進(jìn)行Excel轉(zhuǎn)換操作，并返回轉(zhuǎn)換的文件下載鏈接
 string urlPath = ExcelHelper.EntityListToExcel2003(cellheader, enlist, "學(xué)生成績(jī)");
 System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
 context.Response.ContentType = "text/plain";
 context.Response.Write(js.Serialize(urlPath)); // 返回Json格式的內(nèi)容
 }
 catch (Exception ex)
 {
 throw ex;
 }
}