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(IEnumerable data, string FileName, string OpenPassword = "")
        /// 

        /// 保存数据列表到Excel（泛型）
        /// 
        /// 集合数据类型
        /// 数据列表
        /// Excel文件
        /// Excel打开密码
        public static void SaveToExcel(IEnumerable 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 LoadFromExcel(string FileName) where T : new()
        /// 

        /// 从Excel中加载数据（泛型）
        /// 
        /// 每行数据的类型
        /// Excel文件名
        /// 泛型列表
        private static IEnumerable LoadFromExcel(string FileName) where T : new()
        {
            FileInfo existingFile = new FileInfo(FileName);
            List resultList = new List();
            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 propertyInfoList = new List(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());
                                    break;
                                case "int16":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "int32":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "int64":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "decimal":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "double":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "datetime":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "boolean":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "byte":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "char":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                case "single":
                                    p.SetValue(result, cell.GetValue());
                                    break;
                                default:
                                    break;
                            }
                        }
                        catch (KeyNotFoundException ex)
                        { }
                    }
                    resultList.Add(result);
                }
            }
            return resultList;
        } 
        #endregion

 

    }

 

转载于:https://www.cnblogs.com/scwyh/p/3483365.html