Question

So I’m trying to update my RadRadialGauge. It will display data (using an animated Needle) that is being retrieved on a real-time basis. I have a RadChartView that currently works by using TimeStamp and Value properties to draw the Chart. When I add a chart, sometimes I might want to add a few based on the variable I’m watching. For instance, if I want to watch Motor Speed and Output Frequency, I have to add multiple vertical axes. Part of my code to handle the data binding for the RadChartView is here:

var lineSeries = new LineSeries();
lineSeries.CategoryBinding =
    new PropertyNameDataPointBinding() { PropertyName = "TimeStamp" };
lineSeries.ValueBinding =
    new PropertyNameDataPointBinding() { PropertyName = "Value" };
lineSeries.ItemsSource = (chart.Chart as GuiAnalogQueue).Records;

The rest of the code is just appearance handling, and then at the end I add the LineSeries to my RadChartView.

Now, I’m trying to port this code, in a way, over to RadGauge. I’m not sure how to bind the values to the Needle so the needle moves when the Value changes.
In the XAML I’ve tried Value="{Binding Value}" I’ve tried adding binding to the ValueSource varible. Also I have done needle.Value = chart.Chart.Value;

I can’t figure it out, so any help is appreciated.

UPDATE

This is what I’m trying to accomplish. My Records collection has two properties, Value and TimeStamp. I’m trying to bind my Value in the Records to the needle Value. This is my approach to do it programmatically:

public void InitializeCharts(ChartsVM charts, Theme theme)
{
    DataContext = charts;
    foreach (cVM chart in charts.Charts)
    {
        Binding value = new Binding();
        value.Source = (chart.Chart as GuiAnalogQueue).Records;
        value.Path = new PropertyPath("Value");
        needle.SetBinding(Needle.ValueProperty, value);
    } 
}

However, when I do this, it is not changing the needle.Value at all. My Records is the collection that uses NotifyPropertyChanged(“Records”), so I would expect my needle to change everytime Records is changed.

As you see in my original post, those three lines take care of binding the variables to ChartView charts, however I can’t get the RadGauge to work.

Answer 1

In short, I found that Needle’s don’t use any type of collections for their Values. So when I tried setting up a Source to be inside of a collection, and a Path, it wasn’t really liking that. Instead, I added a property right before I add the Value to the records collection (in my update values function). That way I could set my binding up as:

Binding value = new Binding();         
value.Source = (chart.Chart as GuiAnalogQueue);         
value.Path = new PropertyPath("AnalogValue");
needle.SetBinding(Needle.ValueProperty, value); 

That reads as, the Needle will bind its Value property with the AnalogValue property that is in the Source–chart.Chart as GuiAnalogQueue.

Hope this helps if you’ve been directed to this page.