使用NPOI core插入图片

雨点打透心脏的1/2处 2021-12-10 04:11 235阅读 0赞

闲的无聊，封装一个NPOI core插入图片，下面贴上代码，有注释，我就不讲解了

public class ExcelHelper
        {
            /// <summary>
            /// excel插入图片
            /// </summary>
            /// <param name="excelPath">excel路径</param>
            /// <param name="imgStream">图片流</param>
            /// <param name="rowNumber">图片插入到哪行</param>
            /// <param name="pictureType">图片类型</param>
            /// <param name="cellNumber">图片插入到那列</param>
            /// <param name="height">图片所在的那行的高度</param>
            /// <param name="sheelNumber">哪个sheel，默认为第一个</param>
            public static void InsertImage(string excelPath, Stream imgStream, PictureType pictureType, int rowNumber, int cellNumber, short height, int sheelNumber = 0)
            {
                if (!File.Exists(excelPath))
                {
                    throw new Exception($"file path:'{excelPath}' does not exists.");
                }
                using (Stream excelStream = new FileStream(excelPath, FileMode.Open))
                {
                    IWorkbook workbook = WorkbookFactory.Create(excelStream);
                    ///判断sheet是否存在
                    ISheet sheet = workbook.GetSheetAt(sheelNumber);
                    if (sheet == null)
                    {
                        sheet = workbook.CreateSheet($"sheet{sheelNumber}");
                    }
                    ///判断行是否存在
                    IRow row = sheet.GetRow(rowNumber);
                    if (row == null)
                    {
                        row = sheet.CreateRow(rowNumber);
                    }
                    //设置行高
                    row.Height = height;
                    ///判断列是否存在
                    ICell cell = row.GetCell(cellNumber);
                    if (cell == null)
                    {
                        cell = row.CreateCell(cellNumber);
                    }
                    //将图片流读取到byte数组
                    byte[] bytes = new byte[imgStream.Length];
                    imgStream.Read(bytes, 0, (int)imgStream.Length);
    
                    int pictureIdx = workbook.AddPicture(bytes, pictureType);
                    IDrawing patriarch = sheet.CreateDrawingPatriarch();
                    //指定图片插入的位置
                    IClientAnchor anchor = new XSSFClientAnchor(0, 10, 0, 0, cellNumber, rowNumber, cellNumber + 1, rowNumber + 1);
                    string extension = Path.GetExtension(excelPath);
                    if (extension == ".xls")
                    {
                        anchor = new HSSFClientAnchor(0, 10, 0, 0, cellNumber, rowNumber, cellNumber+1, rowNumber + 1);
                    }
    
                    IPicture pict = patriarch.CreatePicture(anchor, pictureIdx);
    
    
                    using (Stream stream = File.OpenWrite(excelPath))
                    {
                        workbook.Write(stream);
                    }
    
                }
            }
        }

转载于:https://www.cnblogs.com/norain/p/11119412.html