MS chart-Sets the X-axis label according to the maximum minimum time of the database.

Core code:

Chart1.chartareas[0]. Axisx.interval = (front_max-front_min). DAYS/2; Chart1.chartareas[0]. Axisx.minimum = Front_min.tooadate (); Chart1.chartareas[0]. Axisx.maximum = Front_max.tooadate ();

Effect: Minimum database value: 2015-01-12, the maximum value is 2015-05-13, the middle shows a 2015-03-13, only 3 labels are displayed, if 4 lable is divided by 3. One of 4, 3 intervals.

Before because of the following line of code, the label date displays the start date, but extends back and forth for a period of time, the study has not known how to display the starting date.

Chart1.chartareas[0]. Axisx.intervaltype = System.Web.UI.DataVisualization.Charting.DateTimeIntervalType.Days

Delete this line of code, or change to the following, the default is this:

Chart1.chartareas[0]. Axisx.intervaltype = System.Web.UI.DataVisualization.Charting.DateTimeIntervalType.Auto;

Because the ChartType was previously set to date format.

Chart. Series[seriesname]. ChartType = Chartvaluetype.date

　　

Add a modified version of the date range, date interval valid value check:

Try        {            chart1.chartareas[0]. Axisx.minimum = Front_min.adddays (-2). ToOADate ();            Chart1.chartareas[0]. Axisx.maximum = Front_max.adddays (2). ToOADate ();            Double days = (double) ((TimeSpan) (Front_max.adddays (2)-Front_min.adddays (-2))). Days;            Double labels = 2.0;            Check if the number of days was bigger than labels            if (Days > Labels)            {                //calculate the interval                dou ble interval = days/labels;                Chart1.chartareas[0]. Axisx.interval = Interval;            }            else            {                //Set the interval of 1 day                Chart1.chartareas[0]. Axisx.interval = 1;            }        }        Catch         {            //prevent null data         }

　　

　

　　

MS chart-Sets the X-axis label according to the maximum minimum time of the database.