转：https://blog.csdn.net/dcrmg/article/details/52374194#commentBox
在C#中利用NPOI操作Excel表格非常方便，几乎上支持所有的Excel表格本身所有的功能，如字体设置、颜色设置、单元格合并、数值计算、页眉页脚等等。
这里准备使用NPOI生成一个班级成绩单Excel表格，表格中包含的信息包括学号、姓名、各科成绩、平均成绩、排名等。
实现原理很简单，主要是NPOI的一些操作，具体实现的功能包括下边几个：
- 单元格合并
- 字体大小、颜色设置
- 背景颜色设置
- 边框粗细设置
- 多个单元格SUM求和
- 数据写入和读取
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using NPOI.HSSF.UserModel; using NPOI.XSSF.UserModel; using NPOI.SS.UserModel; using System.IO; using System.Data; namespace Score_Excel { class Program { static void Main(string[] args) { IWorkbook workbook = new HSSFWorkbook();//声明工作簿对象，可以创建xls或xlsx Excel文件 ISheet sheet1 = workbook.CreateSheet("Score Record"); //创建工作表 ICell sheet1Title = sheet1.CreateRow(0).CreateCell(0); //创建第一行第一个单元格 sheet1Title.SetCellValue("国家体育总局附属二小幼儿园小一班体育成绩表"); //表头 sheet1Title.CellStyle = GetTitleCellStyle(workbook); sheet1.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 9)); //合并单元格 DataTable dt = GetData(); IRow row; ICell cell; ICellStyle cellStyle1 = GetCellStyle(workbook, 2); ICellStyle cellStyle2 = GetCellStyle(workbook, 0); double[] aveScore = new double[8]; //平均成绩数组 int[] rankNum = new int[8]; //名次数组 //表头数据 row = sheet1.CreateRow(1); cell = row.CreateCell(0); cell.SetCellValue("学号"); cell.CellStyle = cellStyle1; cell = row.CreateCell(1); cell.SetCellValue("姓名"); cell.CellStyle = cellStyle1; cell = row.CreateCell(2); cell.SetCellValue("排球"); cell.CellStyle = cellStyle1; cell = row.CreateCell(3); cell.SetCellValue("乒乓球"); cell.CellStyle = cellStyle1; cell = row.CreateCell(4); cell.SetCellValue("跳水"); cell.CellStyle = cellStyle1; cell = row.CreateCell(5); cell.SetCellValue("举重"); cell.CellStyle = cellStyle1; cell = row.CreateCell(6); cell.SetCellValue("自由泳"); cell.CellStyle = cellStyle1; cell = row.CreateCell(7); cell.SetCellValue("体操"); cell.CellStyle = cellStyle1; cell = row.CreateCell(8); cell.SetCellValue("平均成绩"); cell.CellStyle = cellStyle1; cell = row.CreateCell(9); cell.SetCellValue("名次"); cell.CellStyle = cellStyle1; // 写入数据 for (int i = 0; i < dt.Rows.Count; i++) { DataRow dataR = dt.Rows[i]; row = sheet1.CreateRow(i + 2); cell = row.CreateCell(0); cell.SetCellValue(dataR["学号"].ToString()); cell.CellStyle = cellStyle2; cell = row.CreateCell(1); cell.SetCellValue(dataR["姓名"].ToString()); cell.CellStyle = cellStyle2; cell = row.CreateCell(2); cell.SetCellValue((Double)dataR["排球"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(3); cell.SetCellValue((Double)dataR["乒乓球"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(4); cell.SetCellValue((Double)dataR["跳水"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(5); cell.SetCellValue((Double)dataR["举重"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(6); cell.SetCellValue((Double)dataR["自由泳"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(7); cell.SetCellValue((Double)dataR["体操"]); cell.CellStyle = cellStyle2; cell = row.CreateCell(8); cell.SetCellFormula(String.Format("SUM($C{0}:$H{0})/6", i + 3)); cell.CellStyle = cellStyle2; for (int j = 2; j < 8; j++) { aveScore[i] += row.Cells[j].NumericCellValue; } aveScore[i] /= 6; //每个人平均成绩 } //以下for循环实现对每个人的成绩进行排名 for (int i = 0; i < 8; i++) { rankNum[i] = 1; for (int j = 0; j < 8; j++) { if (aveScore[i] < aveScore[j]) { rankNum[i]++; } } } //排名写入“名次”列 for (int i = 0; i < 8; i++) { row = sheet1.GetRow(i + 2); cell = row.CreateCell(9); cell.SetCellValue(rankNum[i]); cell.CellStyle = cellStyle2; } if (!Directory.Exists(@"E:\Score Excel")) //检查是否存在文件夹，不存在则新建 { Directory.CreateDirectory(@"E:\Score Excel"); } FileStream file = new FileStream(@"E:\Score Excel\Score Record.xls", FileMode.Create); workbook.Write(file); file.Close(); workbook.Close(); } static DataTable GetData() //原始数据 { DataTable dt = new DataTable(); dt.Columns.Add("学号", typeof(System.Int32)); dt.Columns.Add("姓名", typeof(System.String)); dt.Columns.Add("排球", typeof(System.Double)); dt.Columns.Add("乒乓球", typeof(System.Double)); dt.Columns.Add("跳水", typeof(System.Double)); dt.Columns.Add("举重", typeof(System.Double)); dt.Columns.Add("自由泳", typeof(System.Double)); dt.Columns.Add("体操", typeof(System.Double)); dt.Rows.Add("231603001", "张继科", 100, 83, 69.5, 90, 61, 92); dt.Rows.Add("231603002", "傅园慧", 99, 100, 99.9, 100, 100, 99.5); dt.Rows.Add("231603003", "孙杨", 92, 64, 78.5, 64, 69, 90.5); dt.Rows.Add("231603004", "福原爱", 76, 93.5, 69.5, 85, 87, 61); dt.Rows.Add("231603005", "大魔王", 99, 102, 92, 78, 96.5, 89.5); dt.Rows.Add("231603006", "林丹", 87, 98.5, 78.5, 69.5, 97, 89); dt.Rows.Add("231603007", "丁宁", 85, 93, 87.5, 90.5, 69, 79.5); dt.Rows.Add("231603008", "宁泽涛", 79, 62.5, 87.5, 98, 78, 93.5); return dt; } //设置单元格格式函数，边框粗细3个可选 static ICellStyle GetCellStyle(IWorkbook workbook, int borderThickness) { ICellStyle cellStyle = workbook.CreateCellStyle(); NPOI.SS.UserModel.BorderStyle borderType; switch (borderThickness) { case 0: borderType = NPOI.SS.UserModel.BorderStyle.Thin; break; case 1: borderType = NPOI.SS.UserModel.BorderStyle.Medium; break; case 2: borderType = NPOI.SS.UserModel.BorderStyle.Thick; break; default: borderType = NPOI.SS.UserModel.BorderStyle.Thin; break; } cellStyle.BorderBottom = borderType; cellStyle.BorderTop = borderType; cellStyle.BorderLeft = borderType; cellStyle.BorderRight = borderType; IFont font = workbook.CreateFont();//设置字体大小和颜色 font.FontName = "宋体"; font.FontHeightInPoints = 13; cellStyle.SetFont(font); return cellStyle; } //设置表头格式函数 static ICellStyle GetTitleCellStyle(IWorkbook workbook) { ICellStyle cell1Style = workbook.CreateCellStyle(); cell1Style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; cell1Style.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center; cell1Style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; cell1Style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; cell1Style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; cell1Style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; IFont font = workbook.CreateFont(); //设置字体大小和颜色 font.FontName = "微软雅黑"; font.FontHeightInPoints = 13; font.Color = NPOI.HSSF.Util.HSSFColor.Blue.Index; cell1Style.SetFont(font); cell1Style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.LightGreen.Index; cell1Style.FillPattern = FillPattern.SolidForeground; return cell1Style; } } }
执行后，在E盘指定目录下生成了名字是“Score Excel”的表格：
“名次”列的排名实现：
先声明了一个大小为8的Int数组，默认值设为1，依次拿当前的平均成绩和其他7个的平均成绩对比，有几个大于当前平均成绩的元素，就在当前数组值上加上几，最后得到的就是每个人的排名，实现如下：
//以下for循环实现对每个人的成绩进行排名 for (int i = 0; i < 8; i++) { rankNum[i] = 1; for (int j = 0; j < 8; j++) { if (aveScore[i] < aveScore[j]) { rankNum[i]++; } } }
