EPPlus实战篇——Excel写入

.net core 项目

可以向excel写入任何类型(T)的数据，只要T中的field的[Display(Name = "1233", Description = "#,##0.00")]：name==excel column header's name   ，dicription==excel cell's formate

引用的nuget包：

1.EPPlus.Core

2. System.ComponentModel.Annotations

操作类：

    public class ExcelWriteReadAccordingDisplayService<T> : IExcelWriteService<T> where T : class
    {
        ILogBase _logger;
        Dictionary<int, PropertyInfo> _columnIndexDicForProperInfo;
        Dictionary<int, DisplayAttribute> _columnIndexDicForDisplayAttr;
        public ExcelWriteReadAccordingDisplayService(ILogBase logBase)
        {
            _logger = logBase;
        }
    }

class ExcelWriteReadAccordingDisplayService 中的方法：

　　main method：

        public bool WriteData(List<T> data, string excelPath, string sheetName)
        {

            try
            {
                if (!WriteRequestCheck(excelPath))
                {
                    _logger.Warn($"WriteData Request not valid.excelPath :{excelPath},sheetName:{sheetName}");
                    return false;
                }
                if (string.IsNullOrWhiteSpace(sheetName))
                {
                    sheetName = DateTime.Now.ToString("yyyyMM");
                }

                //set sheet style
                Func<ExcelWorksheet, Color, bool> SetHeadStyle = (targetSheet, backgroundColor) =>
                {
                    using (ExcelRange rng = targetSheet.Cells[, , , targetSheet.Dimension.Columns])
                    {
                        rng.Style.Font.Bold = true;
                        rng.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
                        rng.Style.Fill.PatternType = ExcelFillStyle.Solid;
                        rng.Style.Fill.BackgroundColor.SetColor(backgroundColor);
                    }
                    targetSheet.Row().Height = targetSheet.Row().Height * 1.4f;
                    return true;
                };

                Func<ExcelWorksheet, bool> SetAllCellsStyle = (targetSheet) =>
                {
                    using (ExcelRange rng = targetSheet.Cells)
                    {
                        rng.AutoFitColumns();
                    }
                    return true;
                };

                using (ExcelPackage package = new ExcelPackage())
                {
                    ExcelWorksheet sheet = AddSheet(package, sheetName);

                    //write data to excel
                    GetColumnIndexDic(sheet);
                    WriteContent(data, sheet);

                    //set style for excel
                    SetHeadStyle(sheet, Color.FromArgb(, , ));
                    SetAllCellsStyle(sheet);

                    //save
                    package.SaveAs(new FileInfo(excelPath));
                }

                return true;
            }catch(Exception ex)
            {
                _logger.Error($"ExcelWrite data exception :{ex.ToString()},excel:{excelPath},data:{JsonConvert.SerializeObject(data)}");
                throw ex;
            }
        }

        public byte[] WriteData(List<T> data, string sheetName)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(sheetName))
                {
                    sheetName = DateTime.Now.ToString("yyyyMM");
                }
                if (data == null || data.Count() == 0)
                {
                    _logger.Warn($"WriteData Request not valid. request.data:{JsonConvert.SerializeObject(data)}");
                    return null;
                }
                return SaveData(data, sheetName);
            }
            catch (Exception ex)
            {
                _logger.Error($"ExcelWrite data exception :{ex.ToString()},sheetName:{sheetName},data:{JsonConvert.SerializeObject(data)}");
                throw ex;
            }
        }

        private bool WriteRequestCheck(string excelPath)
        {
            Func<string, bool> pathValidCheck = (path) =>
            {
                if (string.IsNullOrWhiteSpace(path) || !Path.IsPathRooted(path)) return false;
                return true;
            };

            if (!pathValidCheck(excelPath))
            {
                _logger.Warn($"excelPath not valid,path :{excelPath}");
                return false;
            }
            return true;
        }

        private ExcelWorksheet AddSheet(ExcelPackage package, string sheetName)
        {
            if (package.Workbook.Worksheets[sheetName] != null)
            {
                package.Workbook.Worksheets.Delete(sheetName);
            }
            var sheet = package.Workbook.Worksheets.Add(sheetName);
            return sheet;
        }

        private byte[] SaveData(List<T> data, string sheetName)
        {
            byte[] excelContent = new byte[] { };

            using (ExcelPackage package = new ExcelPackage())
            {
                ExcelWorksheet sheet = AddSheet(package, sheetName);

                //write data to excel
                GetColumnIndexDic(sheet);
                WriteContent(data, sheet);

                //set style for excel
                SetHeadStyle(sheet, Color.FromArgb(255, 242, 204));
                SetAllCellsStyle(sheet);

                //save
                using (System.IO.MemoryStream outStream = new System.IO.MemoryStream())
                {
                    package.SaveAs(outStream);
                    excelContent = outStream.ToArray();
                }
            }
            return excelContent;
        }

　　

       // type T => init excel's header && get some setting info to write excel cell
        private void GetColumnIndexDic(ExcelWorksheet sheet,bool writeHeader=true)
        {
            try
            {
                var typeOfObject = typeof(T);
                var pds = typeOfObject.GetProperties();
                if (pds == null)
                {
                    _logger.Warn($"no PropertyInfos can get from class Type:{typeOfObject.FullName} ");
                    return;
                }

                //Dictionary<excel column index,T's PropertyInfo>
                _columnIndexDicForProperInfo = new Dictionary<int, PropertyInfo>();
                //Dictionary<excel column index,T's PropertyInfo's DisplayAttribute(its name=excle header name,its discription =excel cell style formate)>
                _columnIndexDicForDisplayAttr = new Dictionary<int, DisplayAttribute>();
                int column = 1;
                int row = 1;
                foreach (var p in pds)
                {
                    var attr = p.GetCustomAttribute(typeof(DisplayAttribute)) as DisplayAttribute;
                    if (attr != null)
                    {
                        _columnIndexDicForDisplayAttr.Add(column, attr);
                    }
                    else
                    {
                        _logger.Warn($"no DisplayAttribute can get from PropertyInfo:(class:{typeOfObject.FullName},property:{p.Name})");
                    }

                    if (writeHeader)
                    {
                        sheet.Cells[row, column].Value = attr == null ? p.Name : attr.Name;
                    }
                    _columnIndexDicForProperInfo.Add(column, p);
                    column++;
                }

                if (_columnIndexDicForProperInfo.Count == 0)
                {
                    _logger.Warn($"no _columnIndexDicForProperInfo can get from type:{typeOfObject.FullName}");
                }
                if (_columnIndexDicForDisplayAttr.Count == 0)
                {
                    _logger.Warn($"no _columnIndexDicForDisplayAttr can get from type:{typeOfObject.FullName}");
                }
            }
            catch (Exception ex)
            {
                _logger.Error($"ExcelWrite-GetColumnIndexDic exception :{ex.ToString()}");
                throw ex;
            }
        }

　　

       //fill sheet content according list data
        private void WriteContent(List<T> data,ExcelWorksheet sheet,int startRow=2)
        {
            try
            {
                PropertyInfo propertyTemp = null;
                DisplayAttribute displayAttrTemp = null;
                int column = 1;
                int row = startRow;
                Dictionary<string, Dictionary<string, DisplayAttribute>> enumDic = new Dictionary<string, Dictionary<string, DisplayAttribute>>();
                foreach (var eachData in data)
                {
                    column = 1;
                    foreach (var eachColumn in _columnIndexDicForProperInfo)
                    {
                        if (!_columnIndexDicForProperInfo.ContainsKey(column))
                        {
                            _logger.Warn($"no PropertyInfos can get from _columnIndexDic. current column:{column},_columnIndexDic:{JsonConvert.SerializeObject(_columnIndexDicForProperInfo)} ");
                            continue;
                        }
                        propertyTemp = _columnIndexDicForProperInfo[column];
                        var cellValue = propertyTemp.GetValue(eachData);

                        if (cellValue != null)
                        {
                            FormatCellValue(ref enumDic, ref cellValue, propertyTemp.PropertyType);
                        }
                        sheet.Cells[row, column].Value = cellValue == null ? "" : cellValue;
                        if (_columnIndexDicForDisplayAttr.ContainsKey(column))
                        {
                            displayAttrTemp = _columnIndexDicForDisplayAttr[column];
                            var styleFormate = displayAttrTemp.Description;
                            if (!string.IsNullOrWhiteSpace(styleFormate))
                            {
                                sheet.Cells[row, column].Style.Numberformat.Format = styleFormate;
                            }
                        }
                        column++;
                    }
                    row++;
                }
            }
            catch (Exception ex)
            {
                _logger.Error($"ExcelWrite-WriteContent exception :{ex.ToString()},data:{JsonConvert.SerializeObject(data)}");
                throw ex;
            }
        }

       // formate cell value according type T‘s property’s DisplayAttribute
        private void FormatCellValue(ref Dictionary<string, Dictionary<string, DisplayAttribute>> enumDic, ref object cellValue, Type propertyTypeOfCell)
        {
            if (cellValue == null) return;
            if (propertyTypeOfCell.IsEnum)
            {
                Dictionary<string, DisplayAttribute> enumDicTemp;
                if (enumDic.ContainsKey(propertyTypeOfCell.FullName))
                {
                    enumDicTemp = enumDic[propertyTypeOfCell.FullName];
                }
                else
                {
                    enumDicTemp = GetEnumNameDicForDisplayAttr(propertyTypeOfCell);
                    enumDic.Add(propertyTypeOfCell.FullName, enumDicTemp);
                }

                if (enumDicTemp != null)
                {
                    if (enumDicTemp.ContainsKey(cellValue.ToString()))
                    {
                        cellValue = enumDicTemp[cellValue.ToString()].Name;
                        return;
                    }
                    else
                    {
                        _logger.Warn($"no enum value can get from enum dictionary:{JsonConvert.SerializeObject(enumDicTemp.Keys)} , enum Type:{propertyTypeOfCell.FullName},cell value:{cellValue}");
                    }
                }
                else
                {
                    _logger.Warn($"no enum dictionary can get from enum Type:{propertyTypeOfCell.FullName} ");
                }
                return;
            }
            /*if (propertyTypeOfCell == typeof(int))
            {
                cellValue = Convert.ToInt32(cellValue);
                return;
            }
            if (propertyTypeOfCell == typeof(long))
            {
                cellValue = Convert.ToInt64(cellValue);
                return;
            }
            if (propertyTypeOfCell == typeof(DateTime))
            {
                cellValue = Convert.ToDateTime(cellValue);
                return;
            }
            if (propertyTypeOfCell == typeof(string))
            {
                cellValue = cellValue.ToString();
                return;
            }*/
            return;

        }

        // get enum property Dic<enum value,DisplayAttribute> =>show in excel cell
        private Dictionary<string, DisplayAttribute> GetEnumNameDicForDisplayAttr(Type enumClassType)
        {
            try
            {
                var result = new Dictionary<string, DisplayAttribute>();
                if (enumClassType.IsEnum)
                {
                    var enumValues = enumClassType.GetEnumValues();
                    foreach (var value in enumValues)
                    {
                        MemberInfo memberInfo =
                            enumClassType.GetMember(value.ToString()).First();
                        var descriptionAttribute =
                            memberInfo.GetCustomAttribute<DisplayAttribute>();
                        if (descriptionAttribute != null)
                        {
                            var enumString = Enum.GetName(enumClassType, value);
                            result.Add(value.ToString(), descriptionAttribute);
                        }
                    }
                    if (result == null || result.Count() == 0)
                    {
                        _logger.Warn($"no EnumDic can get from enum Type:{enumClassType.FullName} ");
                    }
                }
                return result;
            }
            catch (Exception ex)
            {
                _logger.Error($"ExcelWrite-GetEnumNameDicForDisplayAttr exception :{ex.ToString()},Type:{enumClassType.FullName}");
                throw ex;
            }
        }

　　

        private bool WriteRequestCheck(string excelPath)
        {
            Func<string, bool> pathValidCheck = (path) =>
            {
                if (string.IsNullOrWhiteSpace(path) || !Path.IsPathRooted(path)) return false;
                return true;
            };

            if (!pathValidCheck(excelPath))
            {
                _logger.Warn($"excelPath not valid,path :{excelPath}");
                return false;
            }
            return true;
        }

        private ExcelWorksheet AddSheet(ExcelPackage package, string sheetName)
        {
            if (package.Workbook.Worksheets[sheetName] != null)
            {
                package.Workbook.Worksheets.Delete(sheetName);
            }
            var sheet = package.Workbook.Worksheets.Add(sheetName);
            return sheet;
        }

　　

enum 定义：

public enum AdvertiseType:Int32
{
    /// <summary>
    /// Search
    /// </summary>
    [Display(Name = "Search")]//important
    Search = 1,

    /// <summary>
    /// Display
    /// </summary>
    [Display(Name = "Display")]
    Display = 2,
}

type T 的定义

    public class FinancialBillEntity
    {

        [Display(Name = "类型")]
        public AdvertiseType AdvertiseType{ get; set; }

        [Display(Name = "总金额", Description = "#,##0.00")]//name==excel header name；discription=cell style formate
        public decimal TotalAdivitisingCost{ get; set; }

        [Display(Name = "赠送", Description = "#,##0.00")]
        public decimal PromotionAmountUSD { get; set; }
   }

　　

应用：

//register interface
services.RegisterServiceR<IExcelWriteService<FinancialBillEntity>, ExcelWriteReadAccordingDisplayService<FinancialBillEntity>>(lifeStyle);

//get interface instance
var excelWriteService= services.GetInstance<IExcelWriteService<FinancialBillEntity>>();

//execute interface method
bool result=_excelWriteService.WriteData(financeBills,cmdOptions.OutputFinanceBillExcelPath,cmdOptions.OutputFinanceBillSheetName);