C#导出Excel,Csv

相信大家经常接触导出了,这边本人就记录下导出的方法以便后面回顾.

xls支持6万条数据

xlsx支持100万条数据 

CSV可以用记事本打开可以用excel打开

using NPOI;
using NPOI.OpenXml4Net;
using NPOI.OpenXmlFormats;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.HSSF.Util;

        /// <summary>
        /// DataTable生成到excel(目前仅支持2维列表导出)
        /// </summary>
        /// <param name="source">数据集</param>
        /// <param name="fullPath"></param>
        /// <returns></returns>
        public static void DataTableExportExcel(DataTable source, string fullPath)
        {
            try
            {
                int index = fullPath.LastIndexOf('.');
                string extension = fullPath.Substring(index);
                IWorkbook workBook = null;
                if (extension == ".xls")
                {
                    workBook = new HSSFWorkbook();
                }
                if (extension == ".xlsx")
                {
                    workBook = new XSSFWorkbook();
                }
                ISheet sheet = workBook.CreateSheet("Sheet1");
                IRow headRow = sheet.CreateRow(0);

                headRow.HeightInPoints = 20;//设置表头高度
                ICellStyle cellStyle = workBook.CreateCellStyle();
                cellStyle.Alignment = HorizontalAlignment.Center;
                cellStyle.VerticalAlignment = VerticalAlignment.Center;
                cellStyle.FillPattern = FillPattern.SolidForeground;
                cellStyle.BorderBottom = BorderStyle.Thin;
                cellStyle.BorderLeft = BorderStyle.Thin;
                cellStyle.BorderRight = BorderStyle.Thin;
                cellStyle.BorderTop = BorderStyle.Thin;
                cellStyle.FillForegroundColor = HSSFColor.Grey25Percent.Index;
                for (int i = 0; i < source.Columns.Count; i++)//生成表头
                {
                    headRow.CreateCell(i).SetCellValue(source.Columns[i].ColumnName);
                    sheet.SetColumnWidth(i, (source.Columns[i].ColumnName.Length * 3) * 256);
                    headRow.GetCell(i).CellStyle = cellStyle;
                }
                IRow row = null;
                ICellStyle cellStyleRow = workBook.CreateCellStyle();
                cellStyleRow.Alignment = HorizontalAlignment.Center;
                cellStyleRow.VerticalAlignment = VerticalAlignment.Center;
                cellStyleRow.FillPattern = FillPattern.SolidForeground;
                cellStyleRow.BorderBottom = BorderStyle.Thin;
                cellStyleRow.BorderLeft = BorderStyle.Thin;
                cellStyleRow.BorderRight = BorderStyle.Thin;
                cellStyleRow.BorderTop = BorderStyle.Thin;
                cellStyleRow.FillForegroundColor = HSSFColor.White.Index;
                for (int i = 0; i < source.Rows.Count; i++)//生成数据体
                {
                    row = sheet.CreateRow(i + 1);
                    for (int j = 0; j < source.Columns.Count; j++)
                    {
                        row.CreateCell(j).SetCellValue(source.Rows[i][j] == null ? "" : source.Rows[i][j].ToString());
                        row.GetCell(j).CellStyle = cellStyleRow;
                    }
                }
                using (FileStream stream = File.OpenWrite(fullPath))
                {
                    workBook.Write(stream);
                }
            }
            catch (Exception ex)
            {
                throw new Exception("生成excel异常数据出错，" + ex.Message);
            }
        }




        /// <summary>
        /// 写入CSV
        /// </summary>
        /// <param name="fileName">文件名</param>
        /// <param name="dt">要写入的datatable</param>
        public static void WriteCSV(string fileName, DataTable dt)
        {
            FileStream fs;
            StreamWriter sw;


            string data = null;

            //判断文件是否存在,存在就不再次写入列名
            if (!File.Exists(fileName))
            {
                fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
                sw = new StreamWriter(fs, Encoding.UTF8);

                //写出列名称
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    data += dt.Columns[i].ColumnName.ToString();
                    if (i < dt.Columns.Count - 1)
                    {
                        data += ",";//中间用，隔开
                    }
                }
                sw.WriteLine(data);
            }
            else
            {
                fs = new FileStream(fileName, FileMode.Append, FileAccess.Write);
                sw = new StreamWriter(fs, Encoding.UTF8);
            }

            //写出各行数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                data = null;
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    data += dt.Rows[i][j].ToString();
                    if (j < dt.Columns.Count - 1)
                    {
                        data += "\t" + ",";//中间用，隔开 这里加入\t是因为 导出excle时会把数字长度超过会科学计数法显示
                    }
                }
                sw.WriteLine(data);
            }
            sw.Close();
            fs.Close();
        }

主要是引用的NPOI 导入导出都有 这边只记录了导出

方法比较简单,传入一个查询出的DT数据集,和路径 路径一般都是配置在Web.config里面读取

<configuration>
  <appSettings>
    <add key="ExportPath" value="DownloadExcels" />
  </appSettings>
</configuration>

读取config配置

string path=this.Server.MapPath("/" + System.Configuration.ConfigurationManager.AppSettings["ExportPath"]);

this.Server.MapPath //应用程序根目录所在的位置

导出方法里面代码如下:

try
                {
                    //string suffix = ".xls";
                    string suffix = ".csv";
                    string FILE_NAME = DateTime.Now.ToString("yyyyMMddHHmm");
                    //避免传入中文时出现乱码,将传过来的值转成UTF-8
                    FILE_NAME = System.Web.HttpUtility.UrlDecode(FILE_NAME, System.Text.Encoding.UTF8);

                    string exportPath = QM.path; //导出文件路径

                    if (!Directory.Exists(exportPath))
                    {
                        Directory.CreateDirectory(exportPath);
                    }
                    string fullFileName = exportPath + "//" + FILE_NAME + suffix;

                    //DataTableExportExcel(dt, fullFileName);

                    WriteCSV(fullFileName, dt);

                    json.Data = "/" + ConfigurationManager.AppSettings["ExportPath"] + "/" + FILE_NAME + suffix;
                }

 

 

这里JSON.Data最后就会形成一个路径

    //导出按钮
    function Getexport() {
        $.ajax({
            type: 'POST',
            url: "/Home/GetExport",
            data: {11             },
            dataType: 'json',
            success: function (res) {
                var json = jQuery.parseJSON(res);
                if (json.Success) {
                    var downError = document.createElement("A");
                    downError.href = json.Data;
                    document.body.appendChild(downError);
                    downError.click();
                }
                else {
                    alert("信息提示导出数据出错，" + json.Message);
                }
            }
        });
    }

 

 第一次写 也不知道怎么排版 大家见谅!