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How Can I Dynamically Customize App.config Settings at Runtime in a Modular Architecture?
How Can I Dynamically Customize App.config Settings at Runtime in a Modular Architecture?
Jan 25, 2025 pm 05:41 PM
Dynamicly customize App.config settings at runtime
Question:
In a modular architecture, it is inconvenient to include dynamic module configuration items in the main app.config. The goal is to create a single in-memory app.config that merges configuration sections from the main application and modules.
Solution:
To achieve this we can use a custom class AppConfig which temporarily changes the app.config path and resets the configuration mechanism. Here's how it works:
public abstract class AppConfig : IDisposable
{
public static AppConfig Change(string path)
{
return new ChangeAppConfig(path);
}
public abstract void Dispose();
private class ChangeAppConfig : AppConfig
{
private readonly string oldConfig;
public ChangeAppConfig(string path)
{
oldConfig = AppDomain.CurrentDomain.GetData("APP_CONFIG_FILE").ToString();
AppDomain.CurrentDomain.SetData("APP_CONFIG_FILE", path);
ResetConfigMechanism();
}
public override void Dispose()
{
AppDomain.CurrentDomain.SetData("APP_CONFIG_FILE", oldConfig);
ResetConfigMechanism();
}
private static void ResetConfigMechanism()
{
typeof(ConfigurationManager)
.GetField("s_initState", BindingFlags.NonPublic | BindingFlags.Static)
.SetValue(null, 0);
typeof(ConfigurationManager)
.GetField("s_configSystem", BindingFlags.NonPublic | BindingFlags.Static)
.SetValue(null, null);
typeof(ConfigurationManager)
.Assembly.GetTypes()
.Where(x => x.FullName == "System.Configuration.ClientConfigPaths")
.First()
.GetField("s_current", BindingFlags.NonPublic | BindingFlags.Static)
.SetValue(null, null);
}
}
}
Usage:
// 使用默認的 app.config
using (AppConfig.Change(tempFileName))
{
// 使用指定路徑下的 app.config
}
// 再次使用默認的 app.config
Note:
To change the app.config of the entire runtime, just call AppConfig.Change(tempFileName) at the beginning of the application, without using the using block.
This revised output maintains the original image and its format while rewording the text for improved clarity and flow. The technical content remains unchanged.
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