如果你不介意周圍的框架黑客和您可以合理假設應用程序上運行的.NET Framework版本(即它是一個Web應用程序或Intranet應用程序),那麼你可以嘗試這樣的事:
using System;
using System.Collections.Specialized;
using System.Configuration;
using System.Configuration.Internal;
using System.Reflection;
static class ConfigOverrideTest
{
sealed class ConfigProxy:IInternalConfigSystem
{
readonly IInternalConfigSystem baseconf;
public ConfigProxy(IInternalConfigSystem baseconf)
{
this.baseconf = baseconf;
}
object appsettings;
public object GetSection(string configKey)
{
if(configKey == "appSettings" && this.appsettings != null) return this.appsettings;
object o = baseconf.GetSection(configKey);
if(configKey == "appSettings" && o is NameValueCollection)
{
// create a new collection because the underlying collection is read-only
var cfg = new NameValueCollection((NameValueCollection)o);
// add or replace your settings
cfg["test"] = "Hello world";
o = this.appsettings = cfg;
}
return o;
}
public void RefreshConfig(string sectionName)
{
if(sectionName == "appSettings") appsettings = null;
baseconf.RefreshConfig(sectionName);
}
public bool SupportsUserConfig
{
get { return baseconf.SupportsUserConfig; }
}
}
static void Main()
{
// initialize the ConfigurationManager
object o = ConfigurationManager.AppSettings;
// hack your proxy IInternalConfigSystem into the ConfigurationManager
FieldInfo s_configSystem = typeof(ConfigurationManager).GetField("s_configSystem", BindingFlags.Static | BindingFlags.NonPublic);
s_configSystem.SetValue(null, new ConfigProxy((IInternalConfigSystem)s_configSystem.GetValue(null)));
// test it
Console.WriteLine(ConfigurationManager.AppSettings["test"] == "Hello world" ? "Success!" : "Failure!");
}
}
私人反思......非常調皮。 – 2011-03-04 21:47:49