Chart Legend

[Joe Bohen]

Hi

 I am totally new to WPF and would appreciate some pointers. I have a window with a chart and a button the buttons click event has the code shown below, I want to display the Depot Name in the legend but this code is not working the chart loads the data and displays the chart but without the legend is it possible to bind the chart to a data table and use the field names as the legend also is this good practice or should I consider a different approach?

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click

        Try

            Dim seriesMapping As New SeriesMapping()

          

            Dim Table1 As DataTable

            Table1 = New DataTable("DepotSales")

 

            Dim Row1, Row2, Row3, Row4 As DataRow

 

 

            Dim Name As DataColumn = New DataColumn("DepotName")

 

            Name.DataType = System.Type.GetType("System.String")

 

            Table1.Columns.Add(Name)

 

            Dim Turnover As DataColumn = New DataColumn("Turnover")

            Turnover.DataType = System.Type.GetType("System.Int32")

            Table1.Columns.Add(Turnover)

 

            Dim DepotID As DataColumn = New DataColumn("DepotID")

            DepotID.DataType = System.Type.GetType("System.Int16")

            Table1.Columns.Add(DepotID)

 

            Row1 = Table1.NewRow()

 

            Row1.Item("Depot") = "North"

            Row1.Item("Turnover") = 69000

            Row1.Item("DepotID") = 1

            Table1.Rows.Add(Row1)

 

            Row2 = Table1.NewRow()

 

            Row2.Item("Depot") = "South"

            Row2.Item("Turnover") = 35000

            Row2.Item("DepotID") = 2

            Table1.Rows.Add(Row2)

 

            Row3 = Table1.NewRow()

 

            Row3.Item("Depot") = "East"

            Row3.Item("Turnover") = 28000

            Row1.Item("DepotID") = 3

            Table1.Rows.Add(Row3)

 

            Row4 = Table1.NewRow()

 

            Row4.Item("Depot") = "West"

            Row4.Item("Turnover") = 41000

            Row4.Item("DepotID") = 4

            Table1.Rows.Add(Row4)

 

            seriesMapping.LegendLabel = "Turnover"

            seriesMapping.SeriesDefinition = New Bar3DSeriesDefinition

 

            seriesMapping.ItemMappings.Add(New ItemMapping("DepotID", DataPointMember.XValue))

            seriesMapping.ItemMappings.Add(New ItemMapping("DepotName", DataPointMember.XCategory))

            seriesMapping.ItemMappings.Add(New ItemMapping("Turnover", DataPointMember.YValue))

 

            Radchart.SeriesMappings.Add(seriesMapping)

            Me.Radchart.ItemsSource = Table1

 

        Catch ex As Exception

 

        End Try

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[Joe Bohen]

Hi the code supplied works with a standard bar chart but not a 3d chart!

[Ves]

Hello Joe,

You can find attached a small example based on your code. Note, that ItemMappings for XValue and XCategory could not exist at the same time. You can either use XValue or XCategory as both define the item's position along the X axis, so I removed the XValue item mapping. I also added an ItemMapping for the LegendLabel property - again, bound to DepotName. Finally, I set the seriesMapping.SeriesDefinition.LegendDisplayMode property to LegendDisplayMode.DataPointLabel, so that every DataPoint has a corresponding item in the legend.

Regards,
Ves
the Telerik team

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