📄 annotationdatasource.aspx
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<%@ Page Language="VB" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<HTML>
<HEAD>
<TITLE>.netCHARTING Sample</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo 'Horizontal;
Chart.Width = Unit.Parse(600)
Chart.Height = Unit.Parse(350)
Chart.TempDirectory = "temp"
Chart.Debug = True
Chart.DefaultSeries.Type = SeriesType.Line
' This sample will demonstrate how to use data sources to process string tokens in an annotation.
' It will take the series collection we chart and show some additional information about it in an annotation.
' 1. GET DATA
' *DYNAMIC DATA NOTE*
' This sample uses random data to populate the chart. For information on acquiring
' database data see the following resources:
' - Classic samples folder
' - Help File > Data Tutorials
' - Sample: features/DataEngine.aspx
Dim mySC As SeriesCollection = getRandomData()
' 2. CREATE AN ANNOTATION AND SET THE DATA SOURCE.
Dim an As New Annotation()
' Create the data source.
an.DataSource = DataSource.FromSeriesCollection(mySC)
' A simpler way to set the data source that also works is to use
' the implicit casting functionality of the DataSource object.
an.DataSource = mySC
' Specify the text with tokens to replace.
an.Label.Text = "y sum: <%YSum,Currency> " + ControlChars.Lf + " x sum : %XSum"
' Add the annotation to the chart.
Chart.Annotations.Add(an)
' Add the random data.
Chart.SeriesCollection.Add(mySC)
End Sub 'Page_Load
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 0 To 0
Dim s As New Series()
s.Name = "Series " & a
Dim b As Integer
For b = 0 To 19
Dim e As New Element()
'e.Name = "Element " & b;
e.YValue = myR.Next(50)
e.XValue = myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
Return SC
End Function 'getRandomData
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="Chart" runat="server" Width="568px" Height="344px">
</dotnet:Chart>
</DIV>
</BODY>
</HTML>
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