【小5聊】C# NPOI添加图片到Excel指定单元格并自适应宽度

框架：.net core 2.1

NPOI：支持xlsx，.xls，版本=2.5.3

XLS：HSSFWorkbook，主要前缀HSS，

XLSX：XSSFWorkbook，主要前缀XSS，using NPOI.XSSF.UserModel;

1、导出Excel添加图片效果，以及可自适应（以下有调整过宽度）

2、Nuget安装NPOI

 直接安装最新版本 - 2.5.3

3、最新版本数据类型大小写有改动

 之前版本是全部大小，现在的是首字母大写

#region 程序集 NPOI, Version=2.5.3.0, Culture=neutral, PublicKeyToken=0df73ec7942b34e1
// C:\Users\DELL\.nuget\packages\npoi\2.5.3\lib\netstandard2.0\NPOI.dll
#endregion

namespace NPOI.SS.UserModel
{
    public enum CellType
    {
        Unknown = -1,
        Numeric = 0,
        String = 1,
        Formula = 2,
        Blank = 3,
        Boolean = 4,
        Error = 5
    }
}

4、JSON数据

[{
	"id": 1,
	"productNum": 10,
	"addTime": "2021-07-15T08:59:49.997",
	"updateTime": "0001-01-01T00:00:00",
	"productCover": "AmazonProduct/20210715/bc21aee9-b35b-49e6-a50c-7d95178ff487.jpg",
	"productName": "DEERC DE22 GPS Drone with 4K Camera 2-axis Gimbal, EIS Anti-Shake, 5G FPV Live Video Brushless Motor, Auto Return Home, Selfie, Follow Me, Waypoints, Circle Fly 52Min Flight with Carrycase",
	"productPrice": 123.00
}, {
	"id": 2,
	"productNum": 66,
	"addTime": "2021-07-15T08:58:59.257",
	"updateTime": "0001-01-01T00:00:00",
	"productCover": "AmazonProduct/20210715/cea4ff1b-6d5f-46fa-9bea-3745cd80a7d5.jpg",
	"productName": "Neleus Men's Lightweight Workout Running Athletic Shorts with Pockets",
	"productPrice": 26.89
}]

5、导出xls格式代码

#region version=2021.07.15 导出 - Excel - xls - 例子
[HttpPost]
public IActionResult ExcelXls(Model_Request requestModel)
{
    try
    {
        HSSFWorkbook workbook = new HSSFWorkbook(); //创建一个工作簿

        ISheet sheet = workbook.CreateSheet("labelName"); //创建一个sheet

        //设置excel列宽，像素是1/256
        sheet.SetColumnWidth(0, 18 * 256);
        sheet.SetColumnWidth(1, 18 * 256);

        IRow rowTitle = sheet.CreateRow(0);//创建表头行

        rowTitle.CreateCell(0, CellType.String).SetCellValue("编号");
        rowTitle.CreateCell(1, CellType.String).SetCellValue("产品封面");
        rowTitle.CreateCell(2, CellType.String).SetCellValue("产品名称");
        rowTitle.CreateCell(3, CellType.String).SetCellValue("产品价格");
        rowTitle.CreateCell(4, CellType.String).SetCellValue("产品状态");
        rowTitle.CreateCell(5, CellType.String).SetCellValue("产品数量");
        rowTitle.CreateCell(6, CellType.String).SetCellValue("添加时间");

        List list = new List();
        list = new Data().List(requestModel);

        if (list.Count > 0)
        {
            int rowline = 1; //从第二行开始（索引从0开始）

            foreach (AmazonProductApplyModel_Response item in list)
            {
                IRow row = sheet.CreateRow(rowline);
                        
                row.Height = 80 * 20; //设置excel行高，像素点是1/20
                        
                row.CreateCell(0, CellType.String).SetCellValue(item.id); //编号

                //===产品封面===
                //将图片文件读入一个字符串
                byte[] bytes = System.IO.File.ReadAllBytes(PathHelper.BaseDirectory() + item.productCover); //路径（加载图片完整路径）
                int pictureIdx = workbook.AddPicture(bytes, PictureType.JPEG);

                //把图片添加到相应的位置
                HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();
                HSSFClientAnchor anchor = new HSSFClientAnchor(70, 10, 0, 0, 1, rowline, 2, rowline + 1);
                HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
                //===/产品封面===

                row.CreateCell(2, CellType.String).SetCellValue(item.productName); //产品名称
                row.CreateCell(3, CellType.String).SetCellValue(item.productPrice.ToString()); //产品价格
                row.CreateCell(4, CellType.String).SetCellValue(item.productStatus); //产品状态
                row.CreateCell(5, CellType.String).SetCellValue(item.productNum.ToString()); //补货数量
                row.CreateCell(6, CellType.String).SetCellValue(item.addTime.ToString()); //添加时间

                rowline++;
            }

            //设置自适应宽度
            for (int columnNum = 0; columnNum < 7; columnNum++)
            {
                int columnWidth = sheet.GetColumnWidth(columnNum) / 256;
                for (int rowNum = 1; rowNum <= sheet.LastRowNum; rowNum++)
                {
                    IRow currentRow = sheet.GetRow(rowNum);
                    if (currentRow.GetCell(columnNum) != null)
                    {
                        ICell currentCell = currentRow.GetCell(columnNum);
                        int length = Encoding.Default.GetBytes(currentCell.ToString()).Length;
                        if (columnWidth < length)
                        {
                            columnWidth = length;
                        }
                    }
                }
                sheet.SetColumnWidth(columnNum, columnWidth * 256);
            }
        }

        //保存文件
        string name = Guid.NewGuid().ToString() + ".xls";
        string path = AppDomain.CurrentDomain.BaseDirectory + "\\" + name;
        using (Stream stream = System.IO.File.Create(path))
        {
            workbook.Write(stream);
        }

        return Json(new { c = 200, m = "导出成功", path = path });
    }
    catch (Exception ex)
    {

    }
    finally
    {

    }

    return Json(new { c = 200, m = "导出成功", path = path });
}
#endregion

6、导出xlsx格式代码

#region version=2021.07.15 导出 - Excel - xls - 例子
[HttpPost]
public IActionResult ExcelXls(Model_Request requestModel)
{
    try
    {
        XSSFWorkbook workbook = new XSSFWorkbook(); //创建一个工作簿

        ISheet sheet = workbook.CreateSheet("labelName"); //创建一个sheet

        //设置excel列宽，像素是1/256
        sheet.SetColumnWidth(0, 18 * 256);
        sheet.SetColumnWidth(1, 18 * 256);

        IRow rowTitle = sheet.CreateRow(0);//创建表头行

        rowTitle.CreateCell(0, CellType.String).SetCellValue("编号");
        rowTitle.CreateCell(1, CellType.String).SetCellValue("产品封面");
        rowTitle.CreateCell(2, CellType.String).SetCellValue("产品名称");
        rowTitle.CreateCell(3, CellType.String).SetCellValue("产品价格");
        rowTitle.CreateCell(4, CellType.String).SetCellValue("产品状态");
        rowTitle.CreateCell(5, CellType.String).SetCellValue("产品数量");
        rowTitle.CreateCell(6, CellType.String).SetCellValue("添加时间");

        List list = new List();
        list = new Data().List(requestModel);

        if (list.Count > 0)
        {
            int rowline = 1; //从第二行开始（索引从0开始）

            foreach (AmazonProductApplyModel_Response item in list)
            {
                IRow row = sheet.CreateRow(rowline);
                        
                row.Height = 80 * 20; //设置excel行高，像素点是1/20
                        
                row.CreateCell(0, CellType.String).SetCellValue(item.id); //编号

                //===产品封面===
                //将图片文件读入一个字符串
                byte[] bytes = System.IO.File.ReadAllBytes(PathHelper.BaseDirectory() + item.productCover); //路径（加载图片完整路径）
                int pictureIdx = workbook.AddPicture(bytes, PictureType.JPEG);

                //把图片添加到相应的位置
                XSSFDrawing patriarch = (XSSFDrawing)sheet.CreateDrawingPatriarch();
                XSSFClientAnchor anchor = new XSSFClientAnchor(70, 10, 0, 0, 1, rowline, 2, rowline + 1);
                XSSFPicture pict = (XSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
                //===/产品封面===

                row.CreateCell(2, CellType.String).SetCellValue(item.productName); //产品名称
                row.CreateCell(3, CellType.String).SetCellValue(item.productPrice.ToString()); //产品价格
                row.CreateCell(4, CellType.String).SetCellValue(item.productStatus); //产品状态
                row.CreateCell(5, CellType.String).SetCellValue(item.productNum.ToString()); //补货数量
                row.CreateCell(6, CellType.String).SetCellValue(item.addTime.ToString()); //添加时间

                rowline++;
            }

            //设置自适应宽度
            for (int columnNum = 0; columnNum < 7; columnNum++)
            {
                int columnWidth = sheet.GetColumnWidth(columnNum) / 256;
                for (int rowNum = 1; rowNum <= sheet.LastRowNum; rowNum++)
                {
                    IRow currentRow = sheet.GetRow(rowNum);
                    if (currentRow.GetCell(columnNum) != null)
                    {
                        ICell currentCell = currentRow.GetCell(columnNum);
                        int length = Encoding.Default.GetBytes(currentCell.ToString()).Length;
                        if (columnWidth < length)
                        {
                            columnWidth = length;
                        }
                    }
                }
                sheet.SetColumnWidth(columnNum, columnWidth * 256);
            }
        }

        //保存文件
        string name = Guid.NewGuid().ToString() + ".xls";
        string path = AppDomain.CurrentDomain.BaseDirectory + "\\" + name;
        using (Stream stream = System.IO.File.Create(path))
        {
            workbook.Write(stream);
        }

        return Json(new { c = 200, m = "导出成功", path = path });
    }
    catch (Exception ex)
    {

    }
    finally
    {

    }

    return Json(new { c = 200, m = "导出成功", path = path });
}
#endregion