C# ChartControl 避免日期显示过于密集

                                XYDiagram xy = chartControl1.Diagram as XYDiagram;
                                if (xy != null)
                                {
                                    xy.AxisX.DateTimeOptions.Format = DateTimeFormat.Custom;
                                    xy.AxisX.DateTimeOptions.FormatString = "MM-dd";
                                }