DoughnutChart 类似于饼图，但中心为空心。它继承自 PieChart。
示例
准备数据
var sheet = grid.CurrentWorksheet;
sheet["A2"] = new object[,] {
{ null, 2008, 2009, 2010, 2011, 2012 },
{ "City A", 3, 2, 4, 2, 6 },
};定义范围并创建图表
var dataRange = sheet.Ranges["B3:F3"];
var categoryNamesRange = sheet.Ranges["B2:F2"];
sheet.AddHighlightRange(dataRange);
sheet.AddHighlightRange(categoryNamesRange);
var chart = new Chart.DoughnutChart
{
Location = new Graphics.Point(30, 90),
Size = new Graphics.Size(400, 260),
Title = "Doughnut Chart Sample",
DataSource = new WorksheetChartDataSource(sheet,
categoryNamesRange, dataRange, RowOrColumn.Column),
};
sheet.FloatingObjects.Add(chart);
结果：
自定义
扇区颜色
chart.DataSerialStyles[0].FillColor = Graphics.SolidColor.CornflowerBlue;
chart.DataSerialStyles[1].FillColor = Graphics.SolidColor.LightCoral;