ChartImg.axd 执行子请求时出错

在 web.config 文件中在相应位置加入一下代码

1.

<appSettings>
   <add key="ChartImageHandler" value="storage=file;timeout=20;dir=C:\TempImages\;" />
</appSettings>

2.

<httpHandlers>
    <add path="ChartImg.axd" verb="GET,HEAD" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false" />
</httpHandlers>