c# 数据对象导出成excel或csv文件

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using Excel = Microsoft.Office.Interop.Excel;
namespace  Helper
{
    public class EXCEL_ExportHelper
    {
        class EXCEL_EXPORT
        {
            public bool Export<T>(List<T> source, string saveFileName, out string errMsg)
            {
                errMsg = "";
                Excel.Application xlApp = new Excel.Application();
                if (xlApp == null)
                {
                    errMsg = "无法创建Excel对象，可能您的机子未安装Excel";
                    return false;
                }
                Excel.Workbook workbook = xlApp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
                object missing = System.Reflection.Missing.Value;
                try
                {
                    //写入字段
                    Type t = typeof(T);
                    PropertyInfo[] infos = t.GetProperties();
                    for (int i = 0; i < infos.Length; i++)
                    {
                        object[] customerAttr = infos[i].GetCustomAttributes(typeof(ChineseName), false);
                        if (customerAttr != null && customerAttr.Length > 0 && customerAttr[0] is ChineseName)
                        {
                            ChineseName cName = customerAttr[0] as ChineseName;
                            workbook.Worksheets[1].Cells[1, i + 1] = cName.Name;
                        }
                        else
                        {
                            workbook.Worksheets[1].Cells[1, i + 1] = infos[i].Name;
                        }
                        ((Excel.Range)workbook.Worksheets[1].Cells[1, i + 1]).Font.Bold = true;
                    }
                    //写入数值
                    for (int row = 0; row < source.Count; row++)//一条数据代表一行
                    {
                        for (int colome = 0; colome < infos.Length; colome++)//一条数据代表一列
                        {
                            workbook.Worksheets[1].Cells[row + 2, colome + 1] = "'" + infos[colome].GetValue(source[row], null).ToString();
                        }
                    }
                    workbook.Worksheets[1].Columns.AutoFit();
                    workbook.SaveAs(saveFileName);
                }
                catch (Exception ex)
                {
                    errMsg = ex.Message;
                    return false;
                }
                finally
                {
                    workbook.Close(false);
                    workbook = null;
                    xlApp.Quit();
                    xlApp = null;
                }
                return true;
            }
        }

        class CSV_EXPORT
        {
            public bool Export<T>(List<T> source, string savePath, out string errMsg)
            {
                errMsg = "";
                int fileIndex = 1;
                string saveFileName = savePath;
                while (File.Exists(saveFileName))
                {
                    saveFileName = savePath.Substring(0, savePath.LastIndexOf('.') - 1) + "_" + fileIndex + savePath.Substring(savePath.LastIndexOf('.'), savePath.Length - savePath.LastIndexOf('.'));
                    fileIndex++;
                }
                FileStream fs = new FileStream(saveFileName, FileMode.OpenOrCreate);
                StreamWriter sw = new StreamWriter(fs, Encoding.Default);
                try
                {
                    //写入字段
                    Type t = typeof(T);
                    PropertyInfo[] infos = t.GetProperties();
                    string firstline = "";
                    for (int i = 0; i < infos.Length; i++)
                    {
                        object[] customerAttr = infos[i].GetCustomAttributes(typeof(ChineseName), false);
                        if (customerAttr != null && customerAttr.Length > 0 && customerAttr[0] is ChineseName)
                        {
                            ChineseName cName = customerAttr[0] as ChineseName;
                            firstline = firstline + cName.Name + ",";
                        }
                        else
                        {
                            firstline = firstline + infos[i].Name;
                        }

                    }
                    //写入数值
                    for (int row = 0; row < source.Count; row++)//一条数据代表一行
                    {
                        string rowline = "";
                        for (int colome = 0; colome < infos.Length; colome++)//一条数据代表一列
                        {
                            rowline = rowline + infos[colome].GetValue(source[row], null).ToString() + ",'";
                        }
                        firstline = firstline + "\r\n" + rowline;
                    }
                    sw.Write(firstline);

                }
                catch (Exception ex)
                {
                    errMsg = ex.Message;
                    return false;
                }
                finally
                {
                    sw.Close();
                    sw.Dispose();
                    fs.Close();
                    fs.Dispose();
                }
                return true;
            }
        }

        /// <summary>
        /// 导出数据到文件，可以是excel或csv文件
        /// </summary>
        /// <typeparam name="T">数据类型(请将类型字段加扩展属性ChineseName，这样导出的文件里就以中文名为字段了。如果没有加扩展属性，则只能以英文来显示)</typeparam>
        /// <param name="source">数据源</param>
        /// <param name="saveFileName">要保存的路径</param>
        /// <param name="errMsg">错误反馈</param>
        /// <returns>导出结果</returns>
        public static bool Export<T>(List<T> source, string saveFileName, out string errMsg)
        {
            string extention = saveFileName.Substring(saveFileName.LastIndexOf('.'), saveFileName.Length - saveFileName.LastIndexOf('.'));
            if (extention == ".csv")
            {
                CSV_EXPORT TEMP_CLASS = new CSV_EXPORT();
                bool OK = TEMP_CLASS.Export<T>(source, saveFileName, out errMsg);
                return OK;
            }
            else if (extention == ".xlsx")
            {
                EXCEL_EXPORT TEMP_CLASS = new EXCEL_EXPORT();
                bool OK = TEMP_CLASS.Export<T>(source, saveFileName, out errMsg);
                TEMP_CLASS = null;
                GC.Collect();
                GC.WaitForPendingFinalizers();
                return OK;
            }
            else
            {
                errMsg = "不支持的格式类型，请重试或检查";
                return false;
            }
        }
    }
}