怎么在C#中利用Datatable导出Excel文件？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
具体内容如下
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using Newtonsoft.Json;
namespace EasyFrame.Common
{
/// <summary>
///title调用信息
/// </summary>
public class ChartTitle
{
/// <summary>
/// 调用名
/// </summary>
public string CallName { get; set; }
/// <summary>
/// 标头信息
/// </summary>
public List<ChartName> SetNameList { get; set; }
}
public class ChartName
{
/// <summary>
/// 一级标头
/// </summary>
public string Name { get; set; }
/// <summary>
/// 二级标头
/// </summary>
public List<string> ChartChildNameList { get; set; }
}
public class ExcelHelper
{
//
/// <summary>
/// Datatable导出Excel
/// </summary>
/// <param name="dt">数据</param>
/// <param name="list">表头</param>
/// <param name="counts">总条数</param>
/// <param name="filePath">保存地址</param>
/// <returns></returns>
public static MemoryStream WriteExcel(DataTable dt, List<ChartTitle> objlist, string filePath)
{
var list = objlist.FirstOrDefault(a => a.CallName == "ccc").SetNameList;
if (!string.IsNullOrEmpty(filePath) && null != dt && dt.Rows.Count > 0)
{
XSSFWorkbook book = new XSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet(dt.TableName);
ICell cell = null;
ICellStyle style = book.CreateCellStyle();
IFont font = book.CreateFont();//创建字体样式
IFont fonts = book.CreateFont();//创建字体样式
IFont fontss = book.CreateFont();//创建字体样式
font.Color = NPOI.HSSF.Util.HSSFColor.Red.Index;//设置字体颜色
ICellStyle styles = book.CreateCellStyle(); //红色
fonts.Color = NPOI.HSSF.Util.HSSFColor.Green.Index;
ICellStyle styless = book.CreateCellStyle(); //绿色
fontss.Color = NPOI.HSSF.Util.HSSFColor.Blue.Index;
ICellStyle stylesss = book.CreateCellStyle(); //蓝色
styless.SetFont(fonts);
styles.SetFont(font);
stylesss.SetFont(fontss);
style.Alignment = HorizontalAlignment.Center;
NPOI.SS.UserModel.IRow row1 = sheet.CreateRow(0);
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
var row = row1;
int num = 0;//记录列
var d = true;//是否第一次加载到二级表单
#region 创建表头
//两行单列
for (int i = 0; i < list.Count; i++)
{
if (!d)
{
row = row1;
d = true;
}
if (list[i].ChartChildNameList == null)
{
cell = row.CreateCell(num);
sheet.SetColumnWidth(num, 15 * 256);
cell.SetCellValue(list[i].Name);
cell.CellStyle = style;
sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 1, num, num));
num++;
continue;
}
//两行多列
var count = list[i].ChartChildNameList.Count; //列数
cell = row.CreateCell(num);
cell.SetCellValue(list[i].Name);
cell.CellStyle = style;
sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, num, count + num - 1));
if (d)
{
d = false;
row = row2;
}
var t = 0;
var rang = sheet.GetRow(1);
for (int j = 0; j < count; j++)
{
sheet.SetColumnWidth(num + t, 5 * 256);
cell = row.CreateCell(num + t);
cell.SetCellValue(list[i].ChartChildNameList[j]);
cell.CellStyle = style;
t++;
}
num = num + count;
}
#endregion 创建表头
#region 写入数据
int customs = 0;//记录列数
int clouns = 0;//记录行数
filePath = string.Format(filePath, "XXX");
#region 导出操作
var data1 = JsonConvert.DeserializeObject<List<类名>>(dt.Rows[0][0].ToString());
foreach (var item in data1)
{
NPOI.SS.UserModel.IRow rows = sheet.CreateRow(clouns + 2);
customs = 0;
rows.CreateCell(customs).SetCellValue(Convert.ToString(item.No)); customs++;
rows.CreateCell(customs).SetCellValue(Convert.ToString(item.LotteryOpenNo)); customs++;
for (int i = 0; i < item.Wan.Length; i++)
{
if (item.LotteryOpenNo.Split(',')[0] == item.Wan[i].ToString())
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Wan[i]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Wan[i]); customs++;
}
}
for (int j = 0; j < item.Qian.Length; j++)
{
if (item.LotteryOpenNo.Split(',')[1] == item.Qian[j].ToString())
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Qian[j]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Qian[j]); customs++;
}
}
for (int k = 0; k < item.Bai.Length; k++)
{
if (item.LotteryOpenNo.Split(',')[2] == item.Bai[k].ToString())
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Bai[k]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Bai[k]); customs++;
}
}
for (int l = 0; l < item.Shi.Length; l++)
{
if (item.LotteryOpenNo.Split(',')[3] == (item.Shi[l].ToString()))
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Shi[l]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Shi[l]); customs++;
}
}
for (int m = 0; m < item.Ge.Length; m++)
{
if (item.LotteryOpenNo.Split(',')[4] == (item.Ge[m].ToString()))
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Ge[m]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Ge[m]); customs++;
}
}
for (int n = 0; n < item.Fen.Length; n++)
{
if (item.LotteryOpenNo.Contains(item.Fen[n].ToString()))
{
cell = rows.CreateCell(customs);
cell.SetCellValue(item.Fen[n]);
cell.CellStyle = styles;
customs++;
}
else
{
rows.CreateCell(customs).SetCellValue(item.Fen[n]); customs++;
}
}
clouns++;
}
#endregion
#endregion 写入数据
// 写入到客户端
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
book.Write(ms);
using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
book = null;
return ms;
}
}
return null;
}
}
}看完上述内容，你们掌握怎么在C#中利用Datatable导出Excel文件的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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