Managing Configuration Data Programmatically in ASP.NET 2.0

链接：http://aspalliance.com/1637_Managing_Configuration_Data_Programmatically_in_ASPNET_20.all
Listing 1

Configuration configuration = 
  WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
AppSettingsSection appSettingsSection =
  (AppSettingsSection)configuration.GetSection("appSettings"); 
 if (appSettingsSection != null) 
  { 
   foreach (string key in appSettingsSection.Settings.AllKeys) 
    { 
      Response.Write(key);
    } 
  } 

The following method can be used to update a specific key - value pair in the web.config file.

Listing 2

public void Update(string key, string value) 
{
Configuration configuration = 
  WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
AppSettingsSection appSettingsSection = 
  (AppSettingsSection)configuration.GetSection("appSettings");
   if (appSettingsSection != null) 
   {
       appSettingsSection.Settings[key].Value = value; 
       config.Save();
   }
}

The following method can be used to delete a specific key in the web.config file.

Listing 3

public void Delete(string key) 
{
Configuration configuration = 
  WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
AppSettingsSection appSettingsSection = 
  (AppSettingsSection)configuration.GetSection("appSettings");
  if (appSettingsSection != null) 
  { 
     appSettingsSection.Settings.Remove(key);
     config.Save();
  } 
}