In the Post C# Windows Application Reading app.config file, we saw on how to read the
key values in the App.config file, there are situations where we will have to
update the values in the app.config file dynamically from within the
application.
In this post we shall see on how to update the values in the app.config file from the application.
App.config file before the update.
<?xml version="1.0" encoding="utf-8" ?>
</configuration>
XmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
In this post we shall see on how to update the values in the app.config file from the application.
App.config file before the update.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="TestKey" value="OriginalTestValue" />
</appSettings>
</configuration>
Code to Update
the app.config file
XmlDocument XmlDoc = new XmlDocument();
XmlDocument XmlDoc = new XmlDocument();
XmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
XmlNode keyNode = XmlDoc.SelectSingleNode("/configuration/appSettings/add");
keyNode.Attributes[1].Value
= "UpdatedTestValue";
XmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
App.config
file after the update.
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="TestKey" value="UpdatedTestValue" />
</appSettings>
</configuration>
Add a
reference to the System.Xml Namespace, since we are parsing the app.Config
file.
using System.Xml;
