使用NPOI根据DataSet(DataTable)创建Excel

使用NPOI根据DataSet(DataTable)创建Excel

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System.Web;

namespace ExportExcel
{
public class DataSetExportExcel
{

/// <summary>
///根据DataSet获得Excel文件流，保存文件
/// </summary>
/// <param name="tableSet">DataSet内容</param>
/// <param name="sheetName">Excel中表名</param>
/// <param name="filePath">文件直接保存到本地的位置</param>
/// <returns>Excel内容二进制流</returns>
public static List<string> RenderToExcel(DataSet tableSet, string sheetName, string filePath)
{
using (MemoryStream ms = ExportDataSetToExcel(tableSet, sheetName))
{
SaveToFile(ms, filePath);

byte[] bytes = ms.GetBuffer();
string encodeData = Convert.ToBase64String(bytes);

List<string> fileData = new List<string>();
fileData.Add(encodeData);
fileData.Add(ms.Length.ToString());
return fileData;
}
}

/// <summary>
///根据DataSet获得Excel文件流，弹出选择框用户选择储存位置
/// </summary>
/// <param name="tableSet">DataSet内容</param>
/// <param name="context">浏览器请求</param>
/// <param name="fileName">Excel文件名</param>
/// <param name="sheetName">Excel中表名</param>
public static void RenderToExcel(DataSet tableSet, HttpContext context, string fileName, string sheetName)
{
using (MemoryStream ms = ExportDataSetToExcel(tableSet, sheetName))
{
RenderToBrowser(ms, context, fileName);
}
}

/// <summary>
/// 根据传入的DataSet导出Excel
/// </summary>
/// <param name="sourceDs">DataSet</param>
/// <param name="sheetName">Excel中表名</param>
/// <returns>Excel</returns>
private static MemoryStream ExportDataSetToExcel(DataSet sourceDs, string sheetName)
{
IWorkbook workbook = new HSSFWorkbook();//创建Workbook对象
MemoryStream ms = new MemoryStream();
string[] sheetNames = sheetName.Split(',');
for (int i = 0; i < sheetNames.Length; i++)
{
ISheet sheet = workbook.CreateSheet(sheetNames[i]);//创建工作表
IRow headerRow = sheet.CreateRow(0);

ICellStyle style = workbook.CreateCellStyle();//设置Excel单元格格式
style.Alignment = HorizontalAlignment.Left;//设置Excel内容left对齐
style.VerticalAlignment = VerticalAlignment.Center;//设置Excel内容垂直居中
// handling header.
foreach (DataColumn column in sourceDs.Tables[i].Columns)
{
ICell Icell = headerRow.CreateCell(column.Ordinal);
sheet.AutoSizeColumn(column.Ordinal);//根据内容自动调整单元格宽度
Icell.SetCellValue(column.ColumnName);
Icell.CellStyle = style;
}

// handling value.
int rowIndex = 1;
foreach (DataRow row in sourceDs.Tables[i].Rows)
{
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn column in sourceDs.Tables[i].Columns)
{
ICell Icell = dataRow.CreateCell(column.Ordinal);
sheet.AutoSizeColumn(column.Ordinal);
Icell.SetCellValue(row[column].ToString());

if (row[column].ToString().Contains("\n"))//包含\n的到\n处自动换行
{
style.WrapText = true;
Icell.CellStyle = style;
}
//dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
Icell.CellStyle = style;
}
rowIndex++;
}
}
workbook.Write(ms);
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

workbook = null;
return ms;
}

/// <summary>
/// 保存Excel文件
/// </summary>
/// <param name="ms">内存流</param>
/// <param name="fileName">Excel文件名</param>
private static void SaveToFile(MemoryStream ms, string fileName)
{
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();

fs.Write(data, 0, data.Length);
fs.Flush();

data = null;
}
}

/// <summary>
/// 在浏览器输出文件
/// </summary>
/// <param name="ms">Excel内容流</param>
/// <param name="context">浏览器请求</param>
/// <param name="fileName">Excel文件名</param>
private static void RenderToBrowser(MemoryStream ms, HttpContext context, string fileName)
{
if (context.Request.Browser.Browser == "IE")
fileName = HttpUtility.UrlEncode(fileName);
context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
context.Response.BinaryWrite(ms.ToArray());
}
}
}

<span style="font-family:SimSun;font-size:14px;">List<string> list = new List<string>();
list.Add("Test1");
list.Add("Test2");
list.Add("Test3");
list.Add("Test4");
DataSet dstmp = new DataSet();
if (dstmp.Tables.Contains("TAB_NM"))//已经存在该表的话，删除掉
dstmp.Tables.Remove("TAB_NM");
DataTable table = new DataTable("TAB_NM"); //创建虚拟数据表
DataColumnCollection columns = table.Columns;//获取列集合,添加列
columns.Add("col_id", typeof(String));
columns.Add("col_test1", typeof(String));
columns.Add("col_test2", typeof(String));
columns.Add("col_test3", typeof(String));
columns.Add("opr_date", typeof(DateTime));
DataRow row = table.NewRow();//添加一行数据
row["col_id"] = list[0];
row["col_test1"] = list[1];
row["col_test2"] = list[2];
row["col_test3"] = list[3];
row["opr_date"] = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
table.Rows.Add(row); dstmp.Tables.Add(table); //把信息表放入DataSet中
DataSetExportExcel.RenderToExcel(dstmp, Context,"Test.xls","sheet1");//调用方法打开界面另存Excel</span>

<span style="font-family:SimSun;font-size:14px;">list = new List<string>();
list.Add("Test1");
list.Add("Test2");
list.Add("Test3");
list.Add("Test4");

DataSet dstmp = new DataSet();
if (dstmp.Tables.Contains("TAB_NM"))//已经存在该表的话，删除掉
dstmp.Tables.Remove("TAB_NM");
DataTable table = new DataTable("TAB_NM"); //创建虚拟数据表
DataColumnCollection columns = table.Columns;//获取列集合,添加列
columns.Add("col_id", typeof(String));
columns.Add("col_test1", typeof(String));
columns.Add("col_test2", typeof(String));
columns.Add("col_test3", typeof(String));
columns.Add("opr_date", typeof(DateTime));
DataRow row = table.NewRow();//添加一行数据
row["col_id"] = list[0];
row["col_test1"] = list[1];
row["col_test2"] = list[2];
row["col_test3"] = list[3];
row["opr_date"] = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");

table.Rows.Add(row);
dstmp.Tables.Add(table); //把信息表放入DataSet中
DataSetExportExcel.RenderToExcel(dstmp, "Test", @"C:\TEST\Test.xls");</span>