NPOI设置单元格格式
设置水平居中
//设置style
ICellStyle cellstyle = workbook.CreateCellStyle();
cellstyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
cellstyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
设置行高
IRow row1 = sh.CreateRow(1);
row1.Height = 20 * 20;
设置单元的宽度
IWorkbook wb = new HSSFWorkbook();
//创建表
ISheet sh = wb.CreateSheet("zhiyuan");
//设置单元的宽度
sh.SetColumnWidth(0, 15 * 256);
sh.SetColumnWidth(1, 35 * 256);
sh.SetColumnWidth(2, 15 * 256);
sh.SetColumnWidth(3, 10 * 256);
设置单元格颜色(固定色彩)
使用NPOI设置Excel单元格背景颜色时，应该设置FillForegroundColor属性，而且还要设置FillPattern才行。
style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.PINK.index;
style.FillPattern = FillPatternType.SOLID_FOREGROUND;
设置单元格颜色（RGB）
HSSFPalette palette = wk.GetCustomPalette(); //调色板实例
palette.SetColorAtIndex((short)8, 141, 180, 226); //第一个参数：设置调色板新增颜色的编号，自已设置即可；取值范围8-64
HSSFColor hssFColor = palette.FindColor(141, 180, 226);
style_2.FillForegroundColor = hssFColor.Indexed;
style_2.FillPattern = FillPattern.SolidForeground;
//合并操作
sheet.AddMergedRegion(new CellRangeAddress(index["firstRow"], index["lastRow"], index["firstCol"], index["lastCol"]));//起始行，结束行，起始列，结束列
//设置合并后style
var cell = sheet.GetRow(index["firstRow"]).GetCell(index["firstCol"]);
cell.CellStyle = cellstyle;
参考文献：
https://blog.csdn.net/qq_38370387/article/details/113258871
ICell icell1top = row1.CreateCell(0);
icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
icell1top.SetCellValue("网站名");
ICell icell2top = row1.CreateCell(1);
icell2top.CellStyle = Getcellstyle(wb, stylexls.头);
//创建一个常用的xls文件
private void button3_Click(object sender, EventArgs e)
{
IWorkbook wb = new HSSFWorkbook();
//创建表
ISheet sh = wb.CreateSheet("zhiyuan");
//设置单元的宽度
sh.SetColumnWidth(0, 15 * 256);
sh.SetColumnWidth(1, 35 * 256);
sh.SetColumnWidth(2, 15 * 256);
sh.SetColumnWidth(3, 10 * 256);
int i = 0;
#region 练习合并单元格
sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 3));
//CellRangeAddress（）该方法的参数次序是：开始行号，结束行号，开始列号，结束列号。
IRow row0 = sh.CreateRow(0);
row0.Height = 20 * 20;
ICell icell1top0 = row0.CreateCell(0);
icell1top0.CellStyle = Getcellstyle(wb, stylexls.头);
icell1top0.SetCellValue("标题合并单元");
#endregion
i++;
#region 设置表头
IRow row1 = sh.CreateRow(1);
row1.Height = 20 * 20;
ICell icell1top = row1.CreateCell(0);
icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
icell1top.SetCellValue("网站名");
ICell icell2top = row1.CreateCell(1);
icell2top.CellStyle = Getcellstyle(wb, stylexls.头);
icell2top.SetCellValue("网址");
ICell icell3top = row1.CreateCell(2);
icell3top.CellStyle = Getcellstyle(wb, stylexls.头);
icell3top.SetCellValue("百度快照");
ICell icell4top = row1.CreateCell(3);
icell4top.CellStyle = Getcellstyle(wb, stylexls.头);
icell4top.SetCellValue("百度收录");
#endregion
using(FileStream stm=File.OpenWrite(@"c:/myMergeCell.xls"))
{
wb.Write(stm);
MessageBox.Show("提示：创建成功！");
}
}
#region 定义单元格常用到样式的枚举
public enum stylexls
{
头,
url,
时间,
数字,
钱,
百分比,
中文大写,
科学计数法,
默认
}
#endregion
#region 定义单元格常用到样式
static ICellStyle Getcellstyle(IWorkbook wb, stylexls str)
{
ICellStyle cellStyle = wb.CreateCellStyle();
//定义几种字体
//也可以一种字体，写一些公共属性，然后在下面需要时加特殊的
IFont font12 = wb.CreateFont();
font12.FontHeightInPoints = 10;
font12.FontName = "微软雅黑";
IFont font = wb.CreateFont();
font.FontName = "微软雅黑";
//font.Underline = 1;下划线
IFont fontcolorblue = wb.CreateFont();
fontcolorblue.Color = HSSFColor.OLIVE_GREEN.BLUE.index;
fontcolorblue.IsItalic = true;//下划线
fontcolorblue.FontName = "微软雅黑";
//边框
cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.DOTTED;
cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.HAIR;
cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.HAIR;
cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.DOTTED;
//边框颜色
cellStyle.BottomBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
cellStyle.TopBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
//背景图形，我没有用到过。感觉很丑
//cellStyle.FillBackgroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
//cellStyle.FillForegroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
cellStyle.FillForegroundColor = HSSFColor.WHITE.index;
// cellStyle.FillPattern = FillPatternType.NO_FILL;
cellStyle.FillBackgroundColor = HSSFColor.BLUE.index;
//水平对齐
cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.LEFT;
//垂直对齐
cellStyle.VerticalAlignment = VerticalAlignment.CENTER;
//自动换行
cellStyle.WrapText = true;
//缩进;当设置为1时，前面留的空白太大了。希旺官网改进。或者是我设置的不对
cellStyle.Indention = 0;
//上面基本都是设共公的设置
//下面列出了常用的字段类型
switch (str)
{
case stylexls.头:
// cellStyle.FillPattern = FillPatternType.LEAST_DOTS;
cellStyle.SetFont(font12);
break;
case stylexls.时间:
IDataFormat datastyle = wb.CreateDataFormat();
cellStyle.DataFormat = datastyle.GetFormat("yyyy/mm/dd");
cellStyle.SetFont(font);
break;
case stylexls.数字:
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");
cellStyle.SetFont(font);
break;
case stylexls.钱:
IDataFormat format = wb.CreateDataFormat();
cellStyle.DataFormat = format.GetFormat("￥#,##0");
cellStyle.SetFont(font);
break;
case stylexls.url:
fontcolorblue.Underline = 1;
cellStyle.SetFont(fontcolorblue);
break;
case stylexls.百分比:
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00%");
cellStyle.SetFont(font);
break;
case stylexls.中文大写:
IDataFormat format1 = wb.CreateDataFormat();
cellStyle.DataFormat = format1.GetFormat("[DbNum2][$-804]0");
cellStyle.SetFont(font);
break;
case stylexls.科学计数法:
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00");
cellStyle.SetFont(font);
break;
case stylexls.默认:
cellStyle.SetFont(font);
break;
}
return cellStyle;
}
#endregion
