--------------------- 本文来自 天水宇 的CSDN 博客 ，全文地址请点击：https://blog.csdn.net/xxs77ch/article/details/50553857?utm_source=copy
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using NPOI.HSSF.UserModel;
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using NPOI.SS.Formula.Eval;
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using NPOI.SS.Formula.Functions;
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using NPOI.SS.UserModel;
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using NPOI.XSSF.UserModel;
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using NPOI.POIFS.FileSystem;
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using NPOI.HPSF;
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using System.IO;
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using NPOI.SS.Util;
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using System.Drawing;
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using NPOI.HSSF.Util;
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using System.Web;
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using System.Net;
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using System.Net.Mail;
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namespace NPOI
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{
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class Program10
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{
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static void Main(string[] args)
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{
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//说明：插入图片
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//1.创建EXCEL中的Workbook
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IWorkbook myworkbook = new HSSFWorkbook();
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//2.创建Workbook中的Sheet
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ISheet mysheet = myworkbook.CreateSheet( "sheet1");
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//第一步：读取图片到byte数组
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HttpWebRequest request = (HttpWebRequest)WebRequest.Create( "http://img1.soufunimg.com/message/images/card/tuanproj/201511/2015112703584458_s.jpg");
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byte[] bytes;
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using (Stream stream = request.GetResponse().GetResponseStream())
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{
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using (MemoryStream mstream = new MemoryStream())
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{
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int count = 0;
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byte[] buffer = new byte[1024];
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int readNum = 0;
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while ((readNum = stream.Read(buffer, 0, 1024)) > 0)
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{
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count = count + readNum;
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mstream.Write(buffer, 0, 1024);
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}
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mstream.Position = 0;
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using (BinaryReader br = new BinaryReader(mstream))
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{
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bytes = br.ReadBytes(count);
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}
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}
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}
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//第二步：将图片添加到workbook中 指定图片格式 返回图片所在workbook->Picture数组中的索引地址（从1开始）
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int pictureIdx = myworkbook.AddPicture(bytes, PictureType.JPEG);
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//第三步：在sheet中创建画部
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IDrawing patriarch = mysheet.CreateDrawingPatriarch();
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//第四步：设置锚点 （在起始单元格的X坐标0-1023，Y的坐标0-255，在终止单元格的X坐标0-1023，Y的坐标0-255，起始单元格行数，列数，终止单元格行数，列数）
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IClientAnchor anchor =patriarch.CreateAnchor( 0,0,0,0,0,0,2,2);
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//第五步：创建图片
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IPicture pict = patriarch.CreatePicture(anchor, pictureIdx);
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//6.保存
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FileStream file = new FileStream(@"E:\myworkbook11.xls", FileMode.Create);
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myworkbook.Write(file);
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file.Close();
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}
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}
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}