ASP.NET 4.0 WebForms URL Rewrite breaks MS Chart

I've added the new Chart control to my project and it works well. I've set the

<add key="ChartImageHandler" value="storage=memory;timeout=20;" />

<handlers>
  <add name="ChartImg" verb="*" path="ChartImg.axd"  type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"  />
</handlers>

Everything is fine as long as I use the "/host/Poll.aspx" path in my browser. Things break when switching over to the rewritten URL "host/poll/". I am getting the "System.Web.HttpException was unhan开发者_运维问答dled by user code Message=Error executing child request for ChartImg.axd." exception.

Any ideas how to fix it? Thank you very much!

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I cant actually try this at the moment but how about "~/ChartImg.axd"

Failing that try using image locations

<add key="ChartImageHandler" value="Storage=file; Timeout=20; Url=~/Temp/Charting/;"/>

Edit: And update your chart html

<asp:Chart ID="chrt1" runat="server" Width="550px" Height="400px" 
    SuppressExceptions="True" ImageStorageMode="UseImageLocation"
    ImageLocation="~/Temp/Charting/ChartPic_#SEQ(1000,30)">

And make sure the directory you are writing to exists. I normally do this on app start in the global

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in case you upgrade your website from .Net 3.0 to .Net 4.0 and using IIS 7 you must insert some line in your webconfig like here :

<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
        <handlers>
            <remove name="ChartImageHandler"/>
            <add name="ChartImageHandler" preCondition="integratedMode" verb="*" path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        </handlers>
</system.webServer>