我可以使用ConfigurationManager修改自定义配置部分吗？

Question

I have an App.config of the form

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <configSections>
        <section name="Custom.Config" type="System.Configuration.DictionarySectionHandler, System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    </configSections>

    <kCura.Config configSource="Custom.config" />
</configuration>

With a custom configuration file Custom.config of the form

<?xml version="1.0" encoding="utf-8"?>
<Custom.Config>
    <add key="foo" value="bar" />
</Custom.Config>

I've inherited this code, and there is no existing ConfigurationSection or ConfigurationSectionHandler associated with this Custom.Config section.

I can access the value of foo just fine with

 DirectCast(System.Configuration.ConfigurationManager.GetSection("Custom.Config"), System.Collections.IDictionary)

But now I would like to update this value, programatically (for testing purposes). Is this possible?

I've read the following, and I'm still stumped; they seem to imply that this namespace is only for reading values, not full CRUD:

• How to: Create Custom Configuration Sections Using ConfigurationSection
• How to: Create Custom Configuration Sections Using IConfigurationSectionHandler

Answer 1

You'll have to modify the Custom.config file on disk by using XDocument then you'll need to call RefreshSection on the ConfigurationManager

This will then refresh the named section so the next time that it is retrieved it will be re-read from disk.