用EPPlus导入导出数据到excel

项目上中要用到将数据库中所有表导出为Excel，以及将Excel数据导入数据库中的操作，使用EPPlus组件，编写以下两个函数。

using OfficeOpenXml;
using OfficeOpenXml.Table;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;

    public class ExcelHelper

    {

        #region 保存数据列表到Excel（泛型）+void SaveToExcel<T>(IEnumerable<T> data, string FileName, string OpenPassword = "")

        /// <summary>

        /// 保存数据列表到Excel（泛型）

        /// </summary>

        /// <typeparam name="T">集合数据类型</typeparam>

        /// <param name="data">数据列表</param>

        /// <param name="FileName">Excel文件</param>

        /// <param name="OpenPassword">Excel打开密码</param>

        public static void SaveToExcel<T>(IEnumerable<T> data, string FileName, string OpenPassword = "")

        {

            FileInfo file = new FileInfo(FileName);

            try

            {

                using (ExcelPackage ep = new ExcelPackage(file, OpenPassword))

                {

                    ExcelWorksheet ws = ep.Workbook.Worksheets.Add(typeof(T).Name);

                    ws.Cells["A1"].LoadFromCollection(data, true, TableStyles.Medium10);



                    ep.Save(OpenPassword);

                }

            }

            catch (InvalidOperationException ex)

            {

                Console.WriteLine(ex.Message);

            }

        } 

        #endregion

        #region 从Excel中加载数据（泛型）+IEnumerable<T> LoadFromExcel<T>(string FileName) where T : new()

        /// <summary>

        /// 从Excel中加载数据（泛型）

        /// </summary>

        /// <typeparam name="T">每行数据的类型</typeparam>

        /// <param name="FileName">Excel文件名</param>

        /// <returns>泛型列表</returns>

        private static IEnumerable<T> LoadFromExcel<T>(string FileName) where T : new()

        {

            FileInfo existingFile = new FileInfo(FileName);

            List<T> resultList = new List<T>();

            Dictionary<string, int> dictHeader = new Dictionary<string, int>();



            using (ExcelPackage package = new ExcelPackage(existingFile))

            {

                ExcelWorksheet worksheet = package.Workbook.Worksheets[1];



                int colStart = worksheet.Dimension.Start.Column;  //工作区开始列

                int colEnd = worksheet.Dimension.End.Column;       //工作区结束列

                int rowStart = worksheet.Dimension.Start.Row;       //工作区开始行号

                int rowEnd = worksheet.Dimension.End.Row;       //工作区结束行号



                //将每列标题添加到字典中

                for (int i = colStart; i <= colEnd; i++)

                {

                    dictHeader[worksheet.Cells[rowStart, i].Value.ToString()] = i;

                }



                List<PropertyInfo> propertyInfoList = new List<PropertyInfo>(typeof(T).GetProperties());



                for (int row = rowStart + 1; row < rowEnd; row++)

                {

                    T result = new T();



                    //为对象T的各属性赋值

                    foreach (PropertyInfo p in propertyInfoList)

                    {

                        try

                        {

                            ExcelRange cell = worksheet.Cells[row, dictHeader[p.Name]]; //与属性名对应的单元格



                            if (cell.Value == null)

                                continue;

                            switch (p.PropertyType.Name.ToLower())

                            {

                                case "string":

                                    p.SetValue(result, cell.GetValue<String>());

                                    break;

                                case "int16":

                                    p.SetValue(result, cell.GetValue<Int16>());

                                    break;

                                case "int32":

                                    p.SetValue(result, cell.GetValue<Int32>());

                                    break;

                                case "int64":

                                    p.SetValue(result, cell.GetValue<Int64>());

                                    break;

                                case "decimal":

                                    p.SetValue(result, cell.GetValue<Decimal>());

                                    break;

                                case "double":

                                    p.SetValue(result, cell.GetValue<Double>());

                                    break;

                                case "datetime":

                                    p.SetValue(result, cell.GetValue<DateTime>());

                                    break;

                                case "boolean":

                                    p.SetValue(result, cell.GetValue<Boolean>());

                                    break;

                                case "byte":

                                    p.SetValue(result, cell.GetValue<Byte>());

                                    break;

                                case "char":

                                    p.SetValue(result, cell.GetValue<Char>());

                                    break;

                                case "single":

                                    p.SetValue(result, cell.GetValue<Single>());

                                    break;

                                default:

                                    break;

                            }

                        }

                        catch (KeyNotFoundException ex)

                        { }

                    }

                    resultList.Add(result);

                }

            }

            return resultList;

        } 

        #endregion

 

    }