Question

I’m trying to create a aspx page that return Image/Png from a chartDirector

Here is what I have in my VB so far:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) 
    Handles Me.Load
    Dim mychart As XYChart = New XYChart(700, 170)
    Dim values As Double() = {25, 18, 15, 12, 8, 30, 35}
    Dim labels As String() = {"Labor", "Licenses", "Taxes", "Legal", "Insurance",
                              "Facilities", "Production"}
    mychart.setPlotArea(30, 20, 200, 200)
    mychart.addBarLayer(values)
    Response.ContentType = "image/png"
    Response.BinaryWrite(mychart.makeChart2(Chart.PNG))
    Response.Close()
End Sub

When I run this page I get this output:

I got this idea from the following asp code

   <%@ language="vbscript" %> 
   <% 
   Set cd = CreateObject("ChartDirector.API") 
   'The data for the bar chart 
   data = Array(85, 156, 179.5, 211, 123) 
   'The labels for the bar chart 
   labels = Array("Mon", "Tue", "Wed", "Thu", "Fri") 
   'First, create a XYChart of size 250 pixels x 250 pixels 
   Set c = cd.XYChart(250, 250) 
   'Set the plotarea rectangle to start at (30, 20) and of  
   322
   '200 pixels in width and 200 in height 
   Call c.setPlotArea(30, 20, 200, 200) 
   'Add a bar chart layer using the supplied data 
   Call c.addBarLayer(data) 
   'Set the x-axis labels using the supplied labels 
   Call c.xAxis().setLabels(labels) 
   'output the chart 
   Response.contenttype = "image/png" 
   Response.binarywrite c.makeChart2(cd.PNG) 
   Response.end 
   %> 

and it used img src linked to this page to render the image

QUESTION is how can I do the same implementation in aspx?

Notice I don’t know much about .Net I just started.

Answer 1

Use Response.End instead of Response.Close.

The response is buffered, so if you close it the browser doesn’t get what’s in the buffer unless you flush the buffer before closing the stream.