Got html from WebServices.
With these additional settings to chart control:
Having problem getting chart html from WebService. My task it to have it on client side from WS.
Failed with both of implementations below:
1.
Having "Object reference not set to an instance of an object." on call
With these additional settings to chart control:
chert.UseSession =
false;
chert.TempImagesFolder =
"~/TempImages/";
Having problem getting chart html from WebService. My task it to have it on client side from WS.
Failed with both of implementations below:
1.
[WebMethod]
public
string
GetChart()
{
RadChart chert =
new
RadChart();
chert.ID =
"olapChart"
;
string
result =
string
.Empty;
using
(MemoryStream stream =
new
MemoryStream())
{
StreamWriter writer =
new
StreamWriter(stream);
HtmlTextWriter htmlWriter =
new
HtmlTextWriter(writer);
chert.RenderControl(htmlWriter);
System.Text.ASCIIEncoding encoding =
new
System.Text.ASCIIEncoding();
writer.Flush();
result = encoding.GetString(stream.ToArray());
}
Having "Object reference not set to an instance of an object." on call
chert.RenderControl(htmlWriter);
2.
[WebMethod]
public
string
GetChart()
{
return
GetChartRendered(chert);
}
private
string
GetChartRendered(RadChart chert)
{
string
result =
string
.Empty;
TempRenderer pageHolder =
new
TempRenderer();
HtmlForm tempForm =
new
HtmlForm();
tempForm.ID =
"TempForm"
;
pageHolder.Controls.Add(tempForm);
tempForm.Controls.Add(
new
ScriptManager());
tempForm.Controls.Add(chert);
StringWriter output =
new
StringWriter();
HttpContext.Current.Server.Execute(pageHolder, output,
false
);
result = output.ToString();
return
result;
}
public
partial
class
TempRenderer : System.Web.UI.Page
{
}
Having "Error executing child request for handler 'ChartTest.TempRenderer'" there on Server.Execute.
3. Eventually created just page "chart.aspx" wiht just single chart control decalred
<
telerik:RadChart ID="chert" runat="server" Width="500px" Height="290px" EnableViewState="false" SkinsOverrideStyles="false" ></telerik:RadChart>
and trying this in WebMethod:
StringWriter output =
new
StringWriter();
HttpContext.Current.Server.Execute(
"chart.aspx"
, output,
false
);
string
result = output.ToString();
Having ex:" Error executing child request for chart.aspx."
As I understand the reason of all these exceptions is ChartImage.axd
handler.
If somebody can help - please, it's very urgent.
Thank you.