NPOI generates excel sheet
1. What is NPOI ? The definition given by Baidu Encyclopedia is: NPOI refers to a program built on the POI 3.x version. NPOI can read and write Word or Excel documents without installing Office .
Simply put, NPOI is a powerful class library for reading and writing excel and word documents.
<!--[if !supportLists]--> 2. 2. The basic process of NPOI generating EXCEL table: get data > create table > write data to table
<!--[if !supportLists]--> 3. 3. Code Example
Create two classes: student class and employee class
public class Student
{
public String no;
public String name;
}
public class Worker
{
public String age;
public String job;
public String name;
}
The header of the two sheet pages of the table
/// <summary>
/// Get the student header
/// </summary>
/// <returns></returns>
public List<String> GetStuHeaderList()
{
var stuHeaderList = new List<String>();
stuHeaderList.Add("学号");
stuHeaderList.Add("姓名");
return stuHeaderList;
}
/// <summary>
/// Get the worker header
/// </summary>
/// <returns></returns>
public List<String> GetWorHeaderList()
{
var worHeaderList = new List<String>();
worHeaderList.Add("姓名");
worHeaderList.Add("年龄");
worHeaderList.Add("Work");
return worHeaderList;
}
Obtaining data: The project generally obtains data in the database. Here, for simplicity, add content directly to the list
public void GetData(List<Student> stuList, List<Worker> workList)
{
Student stu1 = new Student();
stu1.no = "1";
stu1.name = "小A";
stuList.Add(stu1);
Student stu2 = new Student();
stu2.no = "2";
stu2.name = "小B";
stuList.Add(stu2);
Worker work1 = new Worker();
work1.age = "20";
work1.job = "Engineer";
work1.name = "小C";
workList.Add(work1);
Worker work2 = new Worker();
work2.age = "22";
work2.job = "Technician";
work2.name = "小D";
workList.Add(work2);
}
Create EXCEL file and write data
public String CreateExcelFile(String filePath, String fileName)
{
String result = "S";
//add data to the list
List<Student> stuList = new List<Student>();
List<Worker> workList = new List<Worker>();
this.GetData(stuList, workList);
if (!string.IsNullOrEmpty(filePath))
{
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("sheet1");
//set the title style
ICellStyle style1 = book.CreateCellStyle();
style1.Alignment = HorizontalAlignment.Center;
IFont font = book.CreateFont();
font.Boldweight = short.MaxValue;
font.FontHeight = 280;
style1.SetFont(font);
//write title
NPOI.SS.UserModel.IRow row1 = sheet.CreateRow(0);
row1.Height = 420;
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, 1));//merge cells
ICell cell1 = row1.CreateCell(0);
cell1.CellStyle = style1;
cell1.SetCellValue("Student Information Table");
//set header font
ICellStyle style2 = book.CreateCellStyle();
style2.Alignment = HorizontalAlignment.Center;
IFont font3 = book.CreateFont();
font3.Boldweight = short.MaxValue;
style2.SetFont(font3);
style2.WrapText = true;
style2.VerticalAlignment = VerticalAlignment.Center;
//write file header
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
List<String> headerList = this.GetStuHeaderList();
for (int i = 0; i < headerList.Count; i++)
{
ICell cell5 = row2.CreateCell(i);
cell5.CellStyle = style2;
cell5.SetCellValue(headerList[i]);
}
//write data
for (int i = 0; i < stuList.Count; i++)
{
NPOI.SS.UserModel.IRow row3 = sheet.CreateRow(i + 2);
row3.CreateCell(0).SetCellValue(stuList[i].no);
row3.CreateCell(1).SetCellValue(stuList[i].name);
}
//create employee table
book = WriteWorkerFileToExcel(book, filePath + @"\" + fileName + ".xls", workList);
// write to client
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
book.Write(ms);
using (FileStream fs = new FileStream(filePath +@"\" + fileName + ".xls", FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
book = null;
}
}
return result;
}
/// <summary>
/// Generate sheet2
/// </summary>
/// <param name="book"></param>
/// <param name="filePath"></param>
/// <param name="workList"></param>
/// <returns></returns>
public NPOI.HSSF.UserModel.HSSFWorkbook WriteWorkerFileToExcel(NPOI.HSSF.UserModel.HSSFWorkbook book, String filePath,List<Worker> workList)
{
if (!string.IsNullOrEmpty(filePath))
{
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("sheet2");
List<String> headerList = this.GetWorHeaderList();
//set the title style
ICellStyle style1 = book.CreateCellStyle();
style1.Alignment = HorizontalAlignment.Center;
IFont font = book.CreateFont();
font.Boldweight = short.MaxValue;
font.FontHeight = 280;
style1.SetFont(font);
//write title
NPOI.SS.UserModel.IRow row1 = sheet.CreateRow(0);
row1.Height = 420;
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, 2));
ICell cell1 = row1.CreateCell(0);
cell1.CellStyle = style1;
cell1.SetCellValue("Employee Information Table");
//set header font
ICellStyle style2 = book.CreateCellStyle();
style2.Alignment = HorizontalAlignment.Center;
IFont font3 = book.CreateFont();
font3.Boldweight = short.MaxValue;
style2.SetFont(font3);
style2.WrapText = true;
style2.VerticalAlignment = VerticalAlignment.Center;
//write file header
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
for (int i = 0; i < headerList.Count; i++)
{
ICell cell5 = row2.CreateCell(i);
cell5.CellStyle = style2;
cell5.SetCellValue(headerList[i]);
}
//write data
for (int i = 0; i < workList.Count; i++)
{
NPOI.SS.UserModel.IRow row3 = sheet.CreateRow(i + 2);
row3.CreateCell(0).SetCellValue(workList[i].name);
row3.CreateCell(1).SetCellValue(workList[i].job);
row3.CreateCell(2).SetCellValue(workList[i].age);
}
return book;
}
return null;
}