/// <summary>
/// 餅狀圖突出設置
/// </summary>
/// <param name="chart">ChartControl</param>
/// <param name="pieSeries">Series【僅僅適用于PieSeriesView】</param>
/// <param name="explodeMode">突出模式【枚舉】</param>
/// <param name="explodedValue">突出間距</param>
/// <param name="dragPie">是否可以拖動突出餅狀</param>
public static void SetPieExplode(this ChartControl chart, Series pieSeries, PieExplodeMode explodeMode, int explodedValue, bool dragPie)
{
    if (pieSeries.View is PieSeriesView)
    {
 //bool _hitTesting = chart.RuntimeHitTesting;
 if (!chart.RuntimeHitTesting)
     chart.RuntimeHitTesting = true;

 PieSeriesView _pieView = pieSeries.View as PieSeriesView;
 _pieView.ExplodeMode = explodeMode;
 _pieView.ExplodedDistancePercentage = explodedValue;
 _pieView.RuntimeExploding = dragPie;

 // chart.RuntimeHitTesting = _hitTesting;
    }
}

private void BuilderDevChart()
{
    Series _pieSeries = new Series("Series 1", ViewType.Pie);
    _pieSeries.ValueDataMembers[0] = "Value";
    _pieSeries.ArgumentDataMember = "Name";
    _pieSeries.DataSource = CreateChartData();
    chartControl1.Series.Add(_pieSeries);
    //----------------------------------------
    _pieSeries.LegendPointOptions.PointView = PointView.ArgumentAndValues;
    _pieSeries.SetPiePercentage(NumericFormat.Percent, PointView.ArgumentAndValues);
    chartControl1.SetAxisXTitle("test", Color.Red);
    _pieSeries.SetLablePosition(PieSeriesLabelPosition.TwoColumns);
    chartControl1.SetPieExplode(_pieSeries, PieExplodeMode.MinValue, 5, true);
}