C# 操做 Excel Chart

1. 添加sheet

   Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
   xlApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
   //取得sheet1
   Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
   //添加sheet3,放在sheet1以后
   Microsoft.Office.Interop.Excel.Worksheet worksheet3 = workbook.Worksheets.Add(After: workbook.Worksheets[1]);

   添加sheet3

2. 加入数据

   //首行表头
   worksheet3.Cells[1, 1] = "数据A";
   worksheet3.Cells[1, 2] = "数据B";
   //A列单元格格式设置为文本
   Excel.Range range = worksheet3.Range[worksheet3.Cells[1, 1], worksheet3.Cells[nolist.Count + 1, 1]];
   range.NumberFormat = "@";//"@"文本格式  "00"数字格式
   //加入数据
    for (int i = 0; i < 30; i++)
   {
       worksheet3.Cells[i + 2, 1] = i.ToString();
       worksheet3.Cells[i + 2, 2] = (i+100).ToString();
   }

   向sheet3加入数据

3. 添加chart，type是柱状：xl3DColumn

   //新增一个Chart,放在sheet1和sheet3之间
   workbook.Charts.Add(Missing.Value, Missing.Value, 1, Missing.Value);

   新增Chart，数据源是sheet3

4. chart数据源

   Excel.Range chartRange = m_Sheet.get_Range("A1", "B32");

   数据源是sheet3的A1至B32数据

5. chart初始化

   //数据源chartRange
   //chart显示类型 Excel.XlChartType.xl3DColumn 3D柱状图
   //Excel.XlRowCol.xlColumns 指定特定数据列是行显示仍是列显示(xlColumns或xlRows)
   //false 是否包含图例 此处选择不包含
   workbook.ActiveChart.ChartWizard(chartRange, Excel.XlChartType.xl3DColumn, Type.Missing, Excel.XlRowCol.xlColumns, 1, 1, false, "chart1", "数据A", "数据B", "");

   用ChartWizard初始化Chart

6. chart数据标签

   //当前的统计图只有一个组
   Excel.ChartGroup grp = (Excel.ChartGroup)workbook.ActiveChart.ChartGroups(1);
   Excel.Series s = (Excel.Series)grp.SeriesCollection(1);
   s.HasDataLabels = true;

   获取当前Chart的图，加入标签

7. chart前景色(柱体颜色)

   //当前Chart中的数据点(柱体)
   Excel.Points points = (Excel.Points)s.Points();
   //excel中的颜色枚举，跟日常的RGB数值不一样
   private enum excelcolor {
               红色 = XlRgbColor.rgbRed,
               绿色 = XlRgbColor.rgbLimeGreen,
               蓝色 = XlRgbColor.rgbDeepSkyBlue
   }
   //改变柱体颜色
   int pc = points.Count + 1;
   for (int i = 1; i < pc; i++)
   {
       Excel.Point point = points.Item(i);
       if (i < 10)
       {
           point.Format.Fill.ForeColor.RGB = (int)excelcolor.绿色;
       }
       else if (i < 20)
       {
           point.Format.Fill.ForeColor.RGB = (int)excelcolor.红色;
       }
       else
       {
           point.Format.Fill.ForeColor.RGB = (int)excelcolor.蓝色;
       }
   }

   改变Chart的前景色