c# 导入导出excel方法封装

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public class ExportAttribute : Attribute     {         public ExportAttribute(bool needExport = true)         {             _NeedExport = needExport;         }           private bool _NeedExport { set; get; }           ///         /// 是否需要导出的字段         ///         public bool NeedExport         {             get { return _NeedExport; }             set { _NeedExport = value; }         }     }     ///     /// 导出excel帮助类     ///     ///     public class ExcelHelper     {         ///         /// 属性描述与类集合缓存         ///         private static Dictionary<Type, List> _propertyNameDic;           ///         /// 属性与类集合缓存         ///         private static Dictionary<Type, PropertyInfo[]> _propertyDic;           ///         /// 属性与描述对应关系集合缓存         ///         public static Dictionary<Type, List> _displayMappProperty;           private string fileName = null; //文件名         private HSSFWorkbook workbook = null;         private XSSFWorkbook xworkbook = null;         private FileStream fs = null;         private bool disposed;           public ExcelHelper()         {         }           ///         /// 有参构造函数 导入EXCEL 时使用         ///         ///         public ExcelHelper(string fileName)         {             this.fileName = fileName;             disposed = false;         }           ///         /// 将excel中的数据导入到实体集合中         /// 使用说明：1.传入的实体属性中displayName描述对应excel中的列名         ///         ///文件         ///sheet名称         ///起始第一行（excel列名开始行）         ///返回的指定的实体集合         public List ExcelToModel(HttpPostedFileBase file, string sheetName = null, int firstRow = 0) where T : new()         {             var models = new List();             DataTable data = new DataTable();             try             {                 using (Stream fs = file.InputStream)                 {                     fileName = file.FileName;                     var fileNameArray = fileName.Split('.');                     if (fileNameArray.Length == 2)                     {                         ISheet sheet = null;                         if (fileNameArray[1].ToLower().Trim() == "xls")                         {                             workbook = new HSSFWorkbook(fs);                             if (sheetName != null)                             {                                 sheet = xworkbook.GetSheet(sheetName);                                 if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet                                 {                                     sheet = xworkbook.GetSheetAt(0);                                 }                             }                             else                             {                                 sheet = xworkbook.GetSheetAt(0);                             }                         }                         else                         {                             xworkbook = new XSSFWorkbook(fs);                             if (sheetName != null)                             {                                 sheet = xworkbook.GetSheet(sheetName);                                 if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet                                 {                                     sheet = xworkbook.GetSheetAt(0);                                 }                             }                             else                             {                                 sheet = xworkbook.GetSheetAt(0);                             }                         }                         models = GetModel(sheet, models, firstRow);                     }                     else                     {                         return null;                     }                 }                 return models;             }             catch (Exception ex)             {                 Console.WriteLine("Exception: " + ex.Message);                 return null;             }         }           ///         /// 保存文件到本地，并且数据转化为实体         ///         ///文件         ///文件保存路径         ///sheet名称         ///起始第一行（excel列名开始行）         ///         public List ExcelToModelAndSave(HttpPostedFileBase file, string savePath, string sheetName = null, int firstRow = 0) where T : new()         {             var models = new List();             DataTable data = new DataTable();             if (!Directory.Exists(savePath))             {                 Directory.CreateDirectory(savePath);             }             try             {                 using (Stream fs = file.InputStream)                 {                     fileName = file.FileName;                     var fileNameArray = fileName.Split('.');                     if (fileNameArray.Length == 2)                     {                         ISheet sheet = null;                         if (fileNameArray[1].ToLower().Trim() == "xls")                         {                             savePath = $"{savePath}\\{DateTime.Now.ToString("dd-HH-mm-ss")}.xls";                             workbook = new HSSFWorkbook(fs);                             if (sheetName != null)                             {                                 sheet = xworkbook.GetSheet(sheetName);                                 if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet                                 {                                     sheet = xworkbook.GetSheetAt(0);                                 }                             }                             else                             {                                 sheet = xworkbook.GetSheetAt(0);                             }                         }                         else                         {                             savePath = $"{savePath}\\{DateTime.Now.ToString("dd-HH-mm-ss")}.xlsx";                             xworkbook = new XSSFWorkbook(fs);                             if (sheetName != null)                             {                                 sheet = xworkbook.GetSheet(sheetName);                                 if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet                                 {                                     sheet = xworkbook.GetSheetAt(0);                                 }                             }                             else                             {                                 sheet = xworkbook.GetSheetAt(0);                             }                         }                         models = GetModel(sheet, models, firstRow);                     }                     else                     {                         return null;                     }                 }                 file.SaveAs(savePath);                 return models;             }             catch (Exception ex)             {                 Console.WriteLine("Exception: " + ex.Message);                 return null;             }         }           ///         /// 导出Excel         /// 使用说明：1.实体中属性的displayName为导出excel中对应的列名，如果没有则按照属性名称         /// 2.实体的属性最好都是字符串或者数字类型的，在展示过程中，不会进行数据转化         ///         ///需要导出的实体模型（实体的属性最好都是字符串或者数字类型的，在展示过程中，不会进行数据转化）         ///请求上下文         ///导出的文件名（默认时间）         ///文件头备注         ///文件底部备注（eg:统计数据的添加）         public void Export(List models, HttpResponseBase Response, string fileName, string remark, string addUp)         {             //首先获取excel中的列名             Type type = typeof(T);             List propertyNames = GetDisplayNames(type);             //Create a new workbook             var workbook = new XSSFWorkbook();             //create a new sheet             var sheet = workbook.CreateSheet("User Accounts");             // Add header labels             var rowIndex = 0;             var rowLength = 0;             //存储文件头备注             if (!string.IsNullOrEmpty(remark))             {                 var rowRemark = sheet.CreateRow(rowIndex);                 rowRemark.CreateCell(rowIndex).SetCellValue(remark);                 //合并单元格                 sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, propertyNames.Count - 1));                 rowIndex++;             }             var row = sheet.CreateRow(rowIndex);             //存储列名             foreach (var propertyName in propertyNames)             {                 row.CreateCell(rowLength).SetCellValue(propertyName);                 rowLength++;             }             //存储值             var propertieValues = _propertyDic[type];             foreach (var model in models)             {                 rowIndex++;                 row = sheet.CreateRow(rowIndex);                 for (var m = 0; m < rowLength; m++)                 {                     var value = propertieValues[m].GetValue(model, null);                     row.CreateCell(m).SetCellValue(value?.ToString());                 }             }             //存储文件尾备注（EG:统计数据）             if (!string.IsNullOrEmpty(addUp))             {                 row = sheet.CreateRow(rowIndex + 1);                 row.CreateCell(0).SetCellValue(addUp);                 //合并单元格                 sheet.AddMergedRegion(new CellRangeAddress(rowIndex + 1, rowIndex + 2, 0, propertyNames.Count - 1));             }             fileName = $"{fileName}{DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")}";             ExportExcel(workbook, Response, fileName);         }           ///         /// 导出文件到浏览器         ///         ///         ///         ///文件名称         private void ExportExcel(XSSFWorkbook workbook, HttpResponseBase Response, string fileName)         {             using (var exportData = new MemoryStream())             {                 workbook.Write(exportData);                 Response.Buffer = true;                 Response.Clear();                 Response.ClearHeaders();                 Response.ClearContent();                 //response.ContentType = "application/ms-excel";                 Response.ContentType = "application/vnd.openxmlformats - officedocument.spreadsheetml.sheet";                 Response.AppendHeader("Content-Type", "text/html; charset=GB2312");                 Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xlsx", fileName));                 Response.Charset = "GB2312";                 Response.ContentEncoding = Encoding.GetEncoding("GB2312");                 Response.BinaryWrite(exportData.GetBuffer());                 Response.Flush();             }         }           ///         /// 根据类型获取实体的描述集合         ///         ///类型         private List GetDisplayNames(Type type)         {             List propertyNames = new List();             if (_propertyNameDic != null && _propertyNameDic.ContainsKey(type))             {                 propertyNames = _propertyNameDic[type];             }             else             {                 var properties = type.GetProperties();                 var propertyResult = new List();                 propertyNames = GetDisplayNames(properties, out propertyResult);                 //添加到缓存                 if (_propertyNameDic == null)                 {                     _propertyNameDic = new Dictionary<Type, List>();                 }                 if (_propertyDic == null)                 {                     _propertyDic = new Dictionary<Type, PropertyInfo[]>();                 }                 _propertyNameDic.Add(type, propertyNames);                 _propertyDic.Add(type, propertyResult.ToArray());             }             return propertyNames;         }           ///         /// 获取属性描述对应关系         ///         ///类型         public List GetMapping(Type type)         {             List mapping = new List();             if (_displayMappProperty != null && _displayMappProperty.ContainsKey(type))             {                 mapping = _displayMappProperty[type];             }             else             {                 var properties = type.GetProperties();                 mapping = GetMapping(properties);                 //添加到缓存                 if (_displayMappProperty == null)                 {                     _displayMappProperty = new Dictionary<Type, List>();                 }                 if (_propertyDic == null)                 {                     _propertyDic = new Dictionary<Type, PropertyInfo[]>();                 }                 _displayMappProperty.Add(type, mapping);                 _propertyDic.Add(type, properties);             }             return mapping;         }           ///         /// 获取实体的描述集合         ///         ///实体属性组         private List GetDisplayNames(PropertyInfo[] propertyInfos, out List propertyInfoList)         {             List propertyNames = new List();             propertyInfoList = new List();             if (propertyInfos != null)             {                 for (var i = 0; i < propertyInfos.Length; i++)                 {                     //判断是否是不需要导出的字段                     var expoertAttribute = propertyInfos[i].GetCustomAttribute();                     if (expoertAttribute == null || expoertAttribute.NeedExport)                     {                         var propertyName = propertyInfos[i].GetCustomAttribute();                         if (propertyName != null && !string.IsNullOrEmpty(propertyName.DisplayName))                         {                             propertyNames.Add(propertyName.DisplayName);                         }                         else                         {                             propertyNames.Add(propertyInfos[i].Name);                         }                         propertyInfoList.Add(propertyInfos[i]);                     }                 }             }             return propertyNames;         }           ///         /// 获取实体中的属性和描述对应关系数据         ///         ///属性集合         private List GetMapping(PropertyInfo[] propertyInfos)         {             List mapping = new List();             if (propertyInfos != null)             {                 for (var i = 0; i < propertyInfos.Length; i++)                 {                     var propertyName = propertyInfos[i].GetCustomAttribute();                     if (propertyName != null && !string.IsNullOrEmpty(propertyName.DisplayName))                     {                         mapping.Add(new DisplayMappProperty { Property = propertyInfos[i], DisplayName = propertyName.DisplayName });                     }                 }             }             return mapping;         }           ///         /// 获取excel中映射的实体数据         ///         ///         ///         ///         ///         ///         private List GetModel(ISheet sheet, List models, int firstRowNum = 0) where T : new()         {             //首先获取excel中的列名             Type type = typeof(T);             List mappings = GetMapping(type);             int startRow = 0;             if (sheet != null)             {                 IRow firstRow = sheet.GetRow(firstRowNum);                 //一行最后一个cell的编号 即总的列数                 int cellCount = firstRow.LastCellNum;                 var cellValues = new string[cellCount];                 //获取excel中的列名                 for (int i = firstRow.FirstCellNum; i < cellCount; i++)                 {                     ICell cell = firstRow.GetCell(i);                     if (cell != null)                     {                         string cellValue = cell.StringCellValue;                         if (cellValue != null)                         {                             cellValues[i] = cellValue;                         }                     }                 }                 //数据开始行                 startRow = firstRowNum + 1;                 //最后一行的标号                 int rowCount = sheet.LastRowNum;                 //读取数据                 for (int i = startRow; i <= rowCount; i++)                 {                     var singT = new T();                     IRow row = sheet.GetRow(i);                     if (row == null) continue; //没有数据的行默认是null　　　　　　　                     for (int j = row.FirstCellNum; j < cellCount; j++)                     {                         //获取Excel中列名                         var cellValue = "";                         if (j < cellValues.Length)                         {                             cellValue = cellValues[j];                         }                         if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null                         //给实体赋值                         {                             //根据列名找到对应关系的属性值                             var property = mappings.FirstOrDefault(n => n.DisplayName == cellValue)?.Property;                             if (property != null)                             {                                 property.SetValue(singT, row.GetCell(j)?.ToString());                             }                         }                     }                     models.Add(singT);                 }             }             return models;         }     }       ///     /// 将excel转化为DataTable     ///     public class ExcelHelper : IDisposable     {         private string fileName = null; //文件名         private IWorkbook workbook = null;         private FileStream fs = null;         private bool disposed;         public ExcelHelper(string fileName)         {             this.fileName = fileName;             disposed = false;         }               ///         /// 将excel中的数据导入到实体中         ///         ///excel工作薄sheet的名称         ///第一行是否是DataTable的列名         /// 返回的DataTable         public DataTable ExcelToDataTable(string sheetName = null, bool isFirstRowColumn = true)         {             ISheet sheet = null;             DataTable data = new DataTable();             int startRow = 0;             try             {                 fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);                 if (fileName.IndexOf(".xlsx") > 0) // 2007版本                     workbook = new XSSFWorkbook(fs);                 else if (fileName.IndexOf(".xls") > 0) // 2003版本                     workbook = new HSSFWorkbook(fs);                 if (sheetName != null)                 {                     sheet = workbook.GetSheet(sheetName);                     if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet                     {                         sheet = workbook.GetSheetAt(0);                     }                 }                 else                 {                     sheet = workbook.GetSheetAt(0);                 }                 if (sheet != null)                 {                     IRow firstRow = sheet.GetRow(0);                     int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数                     if (isFirstRowColumn)                     {                         for (int i = firstRow.FirstCellNum; i < cellCount; ++i)                         {                             ICell cell = firstRow.GetCell(i);                             if (cell != null)                             {                                 string cellValue = cell.StringCellValue;                                 if (cellValue != null)                                 {                                     DataColumn column = new DataColumn(cellValue);                                     data.Columns.Add(column);                                 }                             }                         }                         startRow = sheet.FirstRowNum + 1;                     }                     else                     {                         startRow = sheet.FirstRowNum;                     }                     //最后一列的标号                     int rowCount = sheet.LastRowNum;                     for (int i = startRow; i <= rowCount; ++i)                     {                         IRow row = sheet.GetRow(i);                         if (row == null) continue; //没有数据的行默认是null　　　　　　　                         DataRow dataRow = data.NewRow();                         for (int j = row.FirstCellNum; j < cellCount; ++j)                         {                             if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null                                 dataRow[j] = row.GetCell(j).ToString();                         }                         data.Rows.Add(dataRow);                     }                 }                 return data;             }             catch (Exception ex)             {                 Console.WriteLine("Exception: " + ex.Message);                 return null;             }         }           public void Dispose()         {             Dispose(true);             GC.SuppressFinalize(this);         }           protected virtual void Dispose(bool disposing)         {             if (!this.disposed)             {                 if (disposing)                 {                     if (fs != null)                         fs.Close();                 }                 fs = null;                 disposed = true;             }         }     }       ///     /// 属性描述对应关系     ///     public class DisplayMappProperty     {         ///         /// 属性         ///         public PropertyInfo Property { set; get; }         ///         /// 属性描述  描述对应excel中的列名         ///         public string DisplayName { set; get; }     }     调用方法实例,首先是导入,其中ImportModel是excel对应的实体类型：    public ActionResult Import(HttpPostedFileBase importFile) {         ExcelHelper  important = new ExcelHelper();         var agentInfos = important.ExcelToModel(importFile, null, 1); }        导出实例，其中exportModels是需要导出的数据集合：   new ExcelHelper.Export(exportModels, Response, "活动分润", null,null);