WPF charting DateTimeAxis issue? - wpf

Question

I created a graph with column series by using data visualization and in that i've taken DateTimeAxis as x-axis and i've one combo box with time intervals and based on selection of combo box i need to bind intervals into my graph at runtime. The problem is i'm getting error if i select intervals randomly like
var xAxis = countChart.ActualAxes.OfType<DateTimeAxis>().FirstOrDefault(ax => ax.Orientation == AxisOrientation.X);
xAxis.Minimum = DateTime.Parse(fromDt.ToString("HH:mm:ss"));
xAxis.Maximum = DateTime.Parse(toDt.ToString("HH:mm:ss"));
"The minimum value must be smaller than or equal to the maximum value."
so how can i overcome my problem plz help me.
Thanks,
#Nagaraju.

Answer 1

Check and modify the Minimum and Maximum properties as needed.
Don't use fallback values in binding, but control the dates set by yourself. If you're not using view model, you could use the setter logics in code-behind.
<charting:DateTimeAxis
Orientation="X"
IntervalType="{Binding IntervalType, FallbackValue=Years}"
Interval="{Binding Interval}"
Maximum="{Binding EndDate}"
Minimum="{Binding StartDate}" />
public DateTime StartDate
{
get { return _startDate; }
set
{
if (EndDate < value)
{
EndDate = value;
}
// Set property and notify that property has changed
//...
}
}
private DateTime _endDate;
public DateTime EndDate
{
get { return _endDate; }
set
{
if (StartDate > value)
{
StartDate = value;
}
// Set property and notify that property has changed
//...
}
}

Answer 2

What may be happening here is the new Minimum value you are setting is larger than the old Maximum, so at the line xAxis.Minimum = .. you get an exception. Can you try this as a workaround (also to prove this theory)? Just change the order that you are setting the min/max on the XAxis.
So, use this:
xAxis.Maximum = DateTime.Parse(toDt.ToString("HH:mm:ss")); // Set max first
xAxis.Minimum = DateTime.Parse(fromDt.ToString("HH:mm:ss"));
instead of this:
xAxis.Minimum = DateTime.Parse(fromDt.ToString("HH:mm:ss"));
xAxis.Maximum = DateTime.Parse(toDt.ToString("HH:mm:ss"));
This ensures that the maximum is always larger, so long as your parsed toDT value is larger than the parsed fromDT
Best regards,

Answer 3

i found solution my self..
reset max with tomorrow and min with yesterday.. 'll fix the issue.. like..
xAxis.Minimum = DateTime.Now.AddDays(-1);
xAxis.Maximum = DateTime.Now.AddDays(1);