What do you need exactly?

The idea is to show in each stacked bar the quantity of Emission 
for each instalation.In the X we will find the date, and in the Y axis we 
will find the quantity of emissions. 

ValuesOfExcessVSEmissions = 
new ObservableCollection<InstalationEmissionDateInformation>();


public class InstalationEmissionDateInformation
    {
        #region VARIABLES
 
        public string Instalation;
 
        public Decimal Emission;
 
        public string Date;
 
        public Decimal Assignation;
 
        #endregion VARIABLES
 
        public InstalationEmissionDateInformation(string instalation, 
Decimal emission, string date, Decimal assignation)
        {
            Instalation = instalation;
            Emission = emission;
            Date = date;
            Assignation = assignation;
        }
    }

Hi, here's how you could do it:

<UserControl.Resources>
        <local:TestEmissionsCollection x:Key="data" />
        <igChart:GroupBy 
            x:Key="grouped"
            ItemsSource="{StaticResource data}" 
            GroupMemberPath="Date" 
            KeyMemberPath="Installation" 
            ValueMemberPath="Emission" />
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <igChart:XamDataChart x:Name="theChart">
            <igChart:XamDataChart.Axes>
                <igChart:CategoryXAxis x:Name="xAxis" 
                                       ItemsSource="{StaticResource grouped}"
                                       Label="{}{Key}"/>
                <igChart:NumericYAxis x:Name="yAxis" />
            </igChart:XamDataChart.Axes>

            <igChart:XamDataChart.Series>
                <igChart:StackedColumnSeries x:Name="stack"
                                             ItemsSource="{StaticResource grouped}"
                                             XAxis="{Binding ElementName=xAxis}"
                                             YAxis="{Binding ElementName=yAxis}"
                                             AutoGenerateSeries="True"
                                             >
                   
                </igChart:StackedColumnSeries>
            </igChart:XamDataChart.Series>
        </igChart:XamDataChart>
    </Grid>

And code behind:

public class TestEmissionsCollection
        : ObservableCollection<InstalationEmissionDateInformation>
    {
        public TestEmissionsCollection()
        {
            Add(new InstalationEmissionDateInformation("A", 5, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 2, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 7, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 6, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 8, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 6, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 6, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 4, "1/4/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/4/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 7, "1/4/2012", 1));
        }
    }

    public class InstalationEmissionDateInformation
    {
        public string Installation { get; set; }
        public Decimal Emission { get; set; }
        public string Date { get; set; }
        public Decimal Assignation { get; set; }

        public InstalationEmissionDateInformation(
            string installation, 
            Decimal emission, 
            string date, 
            Decimal assignation)
        {
            Installation = installation;
            Emission = emission;
            Date = date;
            Assignation = assignation;
        }
    }

Please note that I changed your public fields into properties. This is required, currently.

-Graham

Graham,  this example worked great but I'm trying to figure out how it will work on a collection of items that have no keys, or if it's possible.  We have a similar scenario but our collections have no keys that we can trigger off of.  We are needing to see 2 properties stacked and grouped by date but I can't seem to get it to bind properly.  For the example above, if the collection were similar to:

public class TestEmissionsCollection
: ObservableCollection<InstalationEmissionDateInformation>
{
public TestEmissionsCollection()
{
Add(new InstalationEmissionDateInformation(10, 5, "1/1/2012", 1));
Add(new InstalationEmissionDateInformation(4, 2, "1/2/2012", 1));
Add(new InstalationEmissionDateInformation(10, 7, "1/3/2012", 1));
Add(new InstalationEmissionDateInformation(8, 6, "1/4/2012", 1));
Add(new InstalationEmissionDateInformation(5, 3, "1/5/2012", 1));
Add(new InstalationEmissionDateInformation(9, 8, "1/6/2012", 1));
Add(new InstalationEmissionDateInformation(8, 6, "1/7/2012", 1));
Add(new InstalationEmissionDateInformation(5, 3, "1/8/2012", 1));
Add(new InstalationEmissionDateInformation(7, 6, "1/9/2012", 1));
Add(new InstalationEmissionDateInformation(6, 4, "1/10/2012", 1));
Add(new InstalationEmissionDateInformation(5, 3, "1/11/2012", 1));
Add(new InstalationEmissionDateInformation(10, 7, "1/12/2012", 1));
}
}

public class InstalationEmissionDateInformation
{
public Decimal FuelInput { get; set; }
public Decimal Emission { get; set; }
public string Date { get; set; }
public Decimal Assignation { get; set; }

public InstalationEmissionDateInformation(
Decimal fuelinput,
Decimal emission,
string date,
Decimal assignation)
{
FuelInput = fuelinput;
Emission = emission;
Date = date;
Assignation = assignation;
}
}

How can we get this to display all 12 dates with StackedColumnSeries where for each date, the FuelInput and Emissions are stacked and displayed by date on the CategoryXAxis or CategoryDateTimeXAxis?  TIA

JP

Hello JP,

If you want to use GroupBy, you have to define a Key, but if you don't want to, you can see the sample in the Samples Browser under XamDataChart / Display - Series / Gallery - Category Series where it is shown how to use the StackedColumnSeries.

Hope this helps you.

Hello JP,

I noticed that your Date Property is string type, and the CategoryDateTimeXAxis' DateTiemMemeberPath expect a DateTime Property, so I can suggest you change the the type of the Date Property to DateTime.

Hope this helps you.

Hi Stefan,

I guess the problem I'm having is trying to use the CategoryDateTimeXAxis on a collection with no key.  I was attempting to use the GroupBy and use the Date as the GroupMemberPath but my collection is similar to what I sent in the previous post.  There's no definitive key to the collection.  It's basically a collection of objects with 2 value members that i'm attempting to stack and sort by date.  I can build perfectly with a CategoryXAxis but as soon as I replace it with a CategoryDateTimeXAxis and use DateTimeMemberPath="Date" from my collection, it fails.  Not exactly sure what I'm doing wrong. 

TIA, 

JP