asp.net – ConfigurationManager.GetSection返回null以显示正确

这是ConfigSection

<configSections>
<sectionGroup name="HttpExceptionHandler">
  <section name="errorLog" type="System.Configuration.SingleTagSectionHandler,System,Version=1.0.5000.0,Culture=neutral,PublicKeyToken=b77a5c561934e089" />
  <section name="errorMail" type="System.Configuration.SingleTagSectionHandler,PublicKeyToken=b77a5c561934e089" />
</sectionGroup>

这是SectionGroup：

<HttpExceptionHandler>
    <errorLog type="MI.Generic.HttpExceptionHandler.SqlErrorLog,MI.Generic.HttpExceptionHandler" dataSource="opentraderdevdev" initialCatalog="MiTraderError" />
</HttpExceptionHandler>

这是代码：

public class ErrorLogConfiguration : ConfigurationSection
{
    public static ErrorLogConfiguration GetConfig()
    {
        return ConfigurationManager.GetSection("HttpExceptionHandlererrorLog") as ErrorLogConfiguration;
    }

    [ConfigurationProperty("initialCatalog",IsRequired = true)]
    public string InitialCatalog
    {
        get
        {
            return this["initialCatalog"] as string;
        }
    }

    [ConfigurationProperty("dataSource",IsRequired = true)]
    public string DataSource
    {
        get
        {
            return this["dataSource"] as string;
        }
    }
}

返回始终为null.我已经没想完了.任何帮助赞赏.