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Choosing implementing class for interface in config

Hallo!

I want to be able to make my application configurable for which
implementation of XmlReader should be used.

App.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="XmlReader" value="System.Xml.XmlValidatingReader" />
</appSettings>
</configuration>

String xmlReaderString = ConfigurationSettings.AppSettings["XmlReader"];

Type xmlReaderType = Type.GetType(xmlReaderString);

Object[] pathArray = {path};

XmlReader reader = (XmlReader) Activator.CreateInstance(xmlReaderType,
pathArray);

I get a System.ArgumentNullException line.
When I debug it, I note that xmlReaderType is still undifined after the
first line is executed?
What is the proper way to do this?
The examples for instatiating objects thru reflection all use classes from
the System namespace, this works fine. But what about classes from other
assemblies?

Thanks,

Hans
Feb 4 '06 #1
0 904

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