关键代码：

using System;using System.Data;using System.Windows.Forms;using DevExpress.XtraCharts;namespace DevExpressChart{    public partial class winPieSeriesView : Form    {        public winPieSeriesView()        {            InitializeComponent();        }        private DataTable CreateChartData()        {            DataTable table = new DataTable("Table1");            table.Columns.Add("Name", typeof(String));            table.Columns.Add("Value", typeof(Int32));             table.Rows.Add(new object[] { "A", 10 });            table.Rows.Add(new object[] { "B", 20 });            table.Rows.Add(new object[] { "C", 40 });            table.Rows.Add(new object[] { "D", 20 });            table.Rows.Add(new object[] { "E", 30 });            return table;        }        private void winPieSeriesView_Load(object sender, EventArgs e)        {            BuilderDevChart();        }        private void BuilderDevChart()        {            Series _pieSeries = new Series("测试", ViewType.Pie);            _pieSeries.ValueDataMembers[0] = "Value";            _pieSeries.ArgumentDataMember = "Name";            _pieSeries.DataSource = CreateChartData();            chartControl1.Series.Add(_pieSeries);            //----------------------------------------            _pieSeries.LegendPointOptions.PointView = PointView.ArgumentAndValues;            _pieSeries.SetPiePercentage();        }    }}

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        /// <summary>        /// 饼状Series设置成百分比显示        /// </summary>        /// <param name="series">Series</param>        public static void SetPiePercentage(this Series series)        {            if (series.View is PieSeriesView)            {                ((PiePointOptions)series.PointOptions).PercentOptions.ValueAsPercent = true;                ((PiePointOptions)series.PointOptions).ValueNumericOptions.Format = NumericFormat.Percent;                ((PiePointOptions)series.PointOptions).ValueNumericOptions.Precision = 0;            }        }

运行效果：

希望有所帮助！谢谢！

[DevExpress]ChartControl之饼状图百分比演示