Axis Maximum data binding is not working

Hi There

In the Xaml I use:

<ms:Chart.YAxis >
    <ms:ChartAxis Title="Distributions" Maximum="{Binding YMax}" LabelFormat="{}{0:G2}" Name="myY"/>
</ms:Chart.YAxis>

In the ViewModel I have following property :

public double YMax
{
    get { return yMax; }
    set
    {
       if( !yMax.Equals(value) )
       {
           yMax = value;
           RaisePropertyChanged(() => YMax);
       }
    }
}

On the run time, I checked the DataContext of the chart even the axis of myY, they are all valid and right (my view model). I even binding the property to the textbox and it works. I cannot find any example to have binding on Axis's Maximum.

What did I do wrong here? Please help!

Gordon

I have to use Mode=TwoWay... as the following

<ms:Chart.YAxis >
    <ms:ChartAxis Title="Distributions" Maximum="{Binding YMax, Mode=TwoWay}" LabelFormat="{}{0:G2}" Name="myY"/>
</ms:Chart.YAxis>

Hello Gordon

Sorry for the inconvenience here. The way you are setting things up is probably causing the binding to be set after the chart has already specified that the axis range should be set automatically. By setting the Maximum or Minimum value (either in xaml or with a binding) before the chart is loaded, the chart will disable automatic axis range. Usually this works fine if the property you are binding to is in code-behind or in a view-model that is the DataContext of the window/page. You may be setting up your view model in a scenario that we have overlooked. The chart is being loaded before the binding is in place which causes automatic axis ranges to be enabled, thus overriding your property values. Setting the TwoWay mode like what you have done is the best way to solve this.

-Jason

Hi Jason,

The axis Maximum and Minimum binding still have problem even with TwoWay Binding. You can reproduce this by using the sample project I eamil to you. Here is how to reproduce it:

1. Choose the first record on top panel

2. On the bottom panel, enter the value to the datagird (Real value column and Prior Probability column) (1, 0.5); (2, 0.9); (3, 1.5) for example. When you finished 2nd record, it shows only the one bar, when you finish 3rd record, it only shows 2 bars...

3. When you move to 2nd record in top panel and back to 1st record, then all 3 bars shown on the bottom panel.

4. If I did not set the axis Minimum and Maximun value in the xaml, it always show one line since the X-axis only has 0 values

Is it possible for you to fix the problem? It is really annoying... I used the April 3rd Nightly builds.

Thanks

Gordon

Hello Gordon

Thanks for the repro project, this issue has been resolved and will be available through the next nightly build.

Jason Fauchelle