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以後
   Microsoft.Office.Interop.Excel.Worksheet worksheet3 = workbook.Worksheets.Add(After: workbook.Worksheets[1]);

   添加sheet3

2. 加入數據

   //首行表頭
   worksheet3.Cells[1, 1] = "數據A";
   worksheet3.Cells[1, 2] = "數據B";
   //A列單元格格式設置爲文本
   Excel.Range range = worksheet3.Range[worksheet3.Cells[1, 1], worksheet3.Cells[nolist.Count + 1, 1]];
   range.NumberFormat = "@";//"@"文本格式  "00"數字格式
   //加入數據
    for (int i = 0; i < 30; i++)
   {
       worksheet3.Cells[i + 2, 1] = i.ToString();
       worksheet3.Cells[i + 2, 2] = (i+100).ToString();
   }

   向sheet3加入數據

3. 添加chart，type是柱狀：xl3DColumn

   //新增一個Chart,放在sheet1和sheet3之間
   workbook.Charts.Add(Missing.Value, Missing.Value, 1, Missing.Value);

   新增Chart，數據源是sheet3

4. chart數據源

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

   數據源是sheet3的A1至B32數據

5. chart初始化

   //數據源chartRange
   //chart顯示類型 Excel.XlChartType.xl3DColumn 3D柱狀圖
   //Excel.XlRowCol.xlColumns 指定特定數據列是行顯示仍是列顯示(xlColumns或xlRows)
   //false 是否包含圖例 此處選擇不包含
   workbook.ActiveChart.ChartWizard(chartRange, Excel.XlChartType.xl3DColumn, Type.Missing, Excel.XlRowCol.xlColumns, 1, 1, false, "chart1", "數據A", "數據B", "");

   用ChartWizard初始化Chart

6. chart數據標籤

   //當前的統計圖只有一個組
   Excel.ChartGroup grp = (Excel.ChartGroup)workbook.ActiveChart.ChartGroups(1);
   Excel.Series s = (Excel.Series)grp.SeriesCollection(1);
   s.HasDataLabels = true;

   獲取當前Chart的圖，加入標籤

7. chart前景色(柱體顏色)

   //當前Chart中的數據點(柱體)
   Excel.Points points = (Excel.Points)s.Points();
   //excel中的顏色枚舉，跟日常的RGB數值不一樣
   private enum excelcolor {
               紅色 = XlRgbColor.rgbRed,
               綠色 = XlRgbColor.rgbLimeGreen,
               藍色 = XlRgbColor.rgbDeepSkyBlue
   }
   //改變柱體顏色
   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.綠色;
       }
       else if (i < 20)
       {
           point.Format.Fill.ForeColor.RGB = (int)excelcolor.紅色;
       }
       else
       {
           point.Format.Fill.ForeColor.RGB = (int)excelcolor.藍色;
       }
   }

   改變Chart的前景色