C#创建EXCEL图表并保存为图片的实例

using Spire.Xls;
using System.Drawing;
using System.Drawing.Imaging;

namespace CreateChart_XLS
{
 class Program
 {
 static void Main(string[] args)
 {
  //创建一个Workbook类实例，加载Excel文档
  Workbook workbook = new Workbook();
  workbook.LoadFromFile(@"C:\Users\Administrator\Desktop\Sample.xlsx");

  //获取第一个工作表
  Worksheet sheet = workbook.Worksheets[0];

  //设置工作表的名称
  sheet.Name = "柱状图";
  sheet.GridLinesVisible = false;

  //创建柱状图
  Chart chart = sheet.Charts.Add(ExcelChartType.ColumnClustered);

  //指定用于生成图表的数据区域
  chart.DataRange = sheet.Range["A2:G6"];
  chart.SeriesDataFromRange = false;

  //指定图表所在的位置
  chart.LeftColumn = 1;
  chart.TopRow = 9;
  chart.RightColumn = 12;
  chart.BottomRow = 26;

  //设置图表的名称及字体格式
  chart.ChartTitle = "上半年产品销售情况(单位：万美元)";
  chart.ChartTitleArea.IsBold = true;
  chart.ChartTitleArea.Size = 12;

  //设置X轴坐标名称及字体格式
  chart.PrimaryCategoryAxis.Title = "产品类别";
  chart.PrimaryCategoryAxis.Font.IsBold = true;
  chart.PrimaryCategoryAxis.TitleArea.IsBold = false;
  
  //设置Y轴坐标名称及字体格式
  chart.PrimaryValueAxis.Title = "销售额";  
  chart.PrimaryValueAxis.HasMajorGridLines = false;
  chart.PrimaryValueAxis.TitleArea.TextRotationAngle = 90;
  chart.PrimaryValueAxis.MinValue = 0.5;
  chart.PrimaryValueAxis.TitleArea.IsBold = false;

  //设置图例的位置
  chart.Legend.Position = LegendPositionType.Right;

  //保存文档
  workbook.SaveToFile("ColumnChart.xlsx", ExcelVersion.Version2013);


  //加载生成图表后的Excel文档
  workbook.LoadFromFile("ColumnChart.xlsx");

  //遍历工作簿，诊断是否包含图表
  Image[] images = workbook.SaveChartAsImage(sheet);

  for (int i = 0; i < images.Length; i++)
  {
   //将图表保存为图片
   images[i].Save(string.Format("img-{0}.png", i), ImageFormat.Png);
  }
 }
 }
}