利用Aspose.Cells组件导出图片

            //调用
            MemoryStream stream = OutFileToStream(NewTable(), "测试");
            Workbook book = new Workbook(stream);
            Worksheet sheet = book.Worksheets[0];

            sheet.PageSetup.LeftMargin = 0;
            sheet.PageSetup.RightMargin = 0;
            sheet.PageSetup.BottomMargin = 0;
            sheet.PageSetup.TopMargin = 0;

            ImageOrPrintOptions imgOptions = new ImageOrPrintOptions();
            imgOptions.ImageFormat = System.Drawing.Imaging.ImageFormat.Jpeg;

            imgOptions.OnePagePerSheet = true;
            imgOptions.PrintingPage = PrintingPageType.IgnoreBlank;

            SheetRender sr = new SheetRender(sheet, imgOptions);
            sr.ToImage(0, "D:\\book.jpg");

        /// <summary>
        /// 模拟table
        /// </summary>
        /// <returns></returns>
        public DataTable NewTable()
        {
            DataTable tblDatas = new DataTable("Datas");
            tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));
            tblDatas.Columns[0].AutoIncrement = true;
            tblDatas.Columns[0].AutoIncrementSeed = 1;
            tblDatas.Columns[0].AutoIncrementStep = 1;

            tblDatas.Columns.Add("Product", Type.GetType("System.String"));
            tblDatas.Columns.Add("Version", Type.GetType("System.String"));
            tblDatas.Columns.Add("Description", Type.GetType("System.String"));

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
            return tblDatas;
        }
        /// <summary>
        /// 写入流
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="tableName"></param>
        /// <returns></returns>
        public MemoryStream OutFileToStream(DataTable dt, string tableName)
        {
            Workbook workbook = new Workbook(); //工作簿
            Worksheet sheet = workbook.Worksheets[0]; //工作表
            Cells cells = sheet.Cells; //单元格

            //为标题设置样式
            Style styleTitle = workbook.Styles[workbook.Styles.Add()]; //新增样式
            styleTitle.HorizontalAlignment = TextAlignmentType.Center; //文字居中
            styleTitle.Font.Name = "宋体"; //文字字体
            styleTitle.Font.Size = 14; //文字大小
            styleTitle.Font.IsBold = true; //粗体

            //样式2
            Style style2 = workbook.Styles[workbook.Styles.Add()]; //新增样式
            style2.HorizontalAlignment = TextAlignmentType.Center; //文字居中
            style2.Font.Name = "宋体"; //文字字体
            style2.Font.Size = 13; //文字大小
            //style2.Font.IsBold = true; //粗体
            style2.IsTextWrapped = true; //单元格内容自动换行
            style2.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

            //样式3
            Style style3 = workbook.Styles[workbook.Styles.Add()]; //新增样式
            style3.HorizontalAlignment = TextAlignmentType.Center; //文字居中
            style3.Font.Name = "宋体"; //文字字体
            style3.Font.Size = 12; //文字大小
            style3.IsTextWrapped = true; //单元格内容自动换行
            style3.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
            style3.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
            style3.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
            style3.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

            int Colnum = dt.Columns.Count; //表格列数
            int Rownum = dt.Rows.Count; //表格行数

            //生成行1 标题行
            cells.Merge(0, 0, 1, Colnum); //合并单元格
            cells[0, 0].PutValue(tableName); //填写内容
            cells[0, 0].SetStyle(styleTitle);
            cells.SetRowHeight(0, 38);

            //生成行2 列名行
            for (int i = 0; i < Colnum; i++)
            {
                cells[1, i].PutValue(dt.Columns[i].ColumnName);
                cells[1, i].SetStyle(style2);
                cells.SetRowHeight(1, 26);
                cells.SetColumnWidthPixel(i, 200);
            }

            //生成数据行
            for (int i = 0; i < Rownum; i++)
            {
                for (int k = 0; k < Colnum; k++)
                {
                    cells[2 + i, k].PutValue(dt.Rows[i][k].ToString());
                    cells[2 + i, k].SetStyle(style3);
                }
                cells.SetRowHeight(2 + i, 24);
            }

            MemoryStream ms = workbook.SaveToStream();
            return ms;
        }