C# NPOI插入图片到Excel2003和2007以上版本指定位置

先看一下插入后的效果

转载请保留 http://www.luofenming.com/show.aspx?id=ART2020051800001

以下是核心源码

在这里 我在NuGet上下载的是 NPOI 2.5.1版本

引用命名空间
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

/// <summary>
/// 插入图片到Excel2003版本
/// </summary>
public void AddPic()
{
    //读取Excel模版
    FileStream file = new FileStream(@"d:\PurchaseOrder.xls", FileMode.Open, FileAccess.Read);
    IWorkbook workbook = new HSSFWorkbook(file);
    ISheet sheet1 = workbook.GetSheet("sheet1");
    //插入图片
    string picPath = @"C:\Users\lqwvje\Desktop\1.png";
    FileStream picFs = File.OpenRead(picPath); //OpenRead
    int filelength = 0;
    filelength = (int)picFs.Length; //获得文件长度 
    Byte[] image = new Byte[filelength]; //建立一个字节数组 
    picFs.Read(image, 0, filelength); //按字节流读
    int pictureIdx = workbook.AddPicture(image, PictureType.PNG);
    HSSFPatriarch patriarch = (HSSFPatriarch)sheet1.CreateDrawingPatriarch();
    // 插图片的位置  HSSFClientAnchor（dx1,dy1,dx2,dy2,col1,row1,col2,row2) 
    //参数表示图片的位置.文章尾部有说明
    HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, 10, 10, 13,  16);
    //把图片插到相应的位置
    HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
    using (Stream stream = File.OpenWrite(@"d:\aaa.xls"))
    {
        workbook.Write(stream);
    }
}
/// <summary>
///  插入图片到Excel2007以上版本
/// </summary>
public void AddPic2007()
{
    //读取Excel模版
    FileStream file = new FileStream(@"d:\test.xlsx", FileMode.Open, FileAccess.Read);
    IWorkbook workbook = new XSSFWorkbook(file);
    ISheet sheet1 = workbook.GetSheet("sheet1");
    //插入图片
    string picPath = @"C:\Users\lqwvje\Desktop\2.png";
    FileStream picFs = File.OpenRead(picPath); //OpenRead
    int filelength = 0;
    filelength = (int)picFs.Length; //获得文件长度 
    Byte[] image = new Byte[filelength]; //建立一个字节数组 
    picFs.Read(image, 0, filelength); //按字节流读
    int pictureIdx = workbook.AddPicture(image, PictureType.PNG);
    IDrawing patriarch = sheet1.CreateDrawingPatriarch();
    // 插图片的位置  XSSFClientAnchor（dx1,dy1,dx2,dy2,col1,row1,col2,row2) 
    //参数表示图片的位置.文章尾部有说明
    IClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, 2, 3, 6, 9);
    //把图片插到相应的位置
    patriarch.CreatePicture(anchor, pictureIdx);
    using (Stream stream = File.OpenWrite(@"d:\aaa2.xlsx"))
    {
        workbook.Write(stream);
    }
}

HSSFClientAnchor(dx1,dy1,dx2,dy2,col1,row1,col2,row2);
XSSFClientAnchor(dx1,dy1,dx2,dy2,col1,row1,col2,row2);参数说明

dx1 dy1 起始单元格中的x,y坐标.
dx2 dy2 结束单元格中的x,y坐标
col1,row1 指定起始的单元格，下标从0开始
col2,row2 指定结束的单元格，下标从0开始