Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / ConfigurationManager.cs / 1305376 / ConfigurationManager.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Configuration { using System.Collections; using System.Collections.Specialized; using System.Globalization; using System.Configuration.Internal; using System.IO; using System.Security.Permissions; using System.Threading; public static class ConfigurationManager { // The Configuration System private static IInternalConfigSystem s_configSystem; // Initialization state private static InitState s_initState; private static object s_initLock; private static Exception s_initError; private enum InitState { // Initialization has not yet started. NotStarted = 0, // Initialization has started. Started, // The config system can be used, but initialization is not yet complete. Usable, // The config system has been completely initialized. Completed }; static ConfigurationManager() { s_initState = InitState.NotStarted; s_initLock = new object(); } // to be used by System.Diagnostics to avoid false config results during config init internal static bool SetConfigurationSystemInProgress { get { return InitState.NotStarted < s_initState && s_initState < InitState.Completed; } } // Called by ASP.NET to allow hierarchical configuration settings and ASP.NET specific extenstions. internal static void SetConfigurationSystem(IInternalConfigSystem configSystem, bool initComplete) { lock (s_initLock) { // It is an error if the configuration system has already been set. if (s_initState != InitState.NotStarted) { throw new InvalidOperationException(SR.GetString(SR.Config_system_already_set)); } s_configSystem = configSystem; if (initComplete) { s_initState = InitState.Completed; } else { s_initState = InitState.Usable; } } } private static void EnsureConfigurationSystem() { // If a configuration system has not yet been set, // create the DefaultConfigurationSystem for exe's. lock (s_initLock) { if (s_initState < InitState.Usable) { s_initState = InitState.Started; try { try { // Create the system, but let it initialize itself // when GetConfig is called, so that it can handle its // own re-entrancy issues during initialization. // When initialization is complete, the DefaultConfigurationSystem // will call CompleteConfigInit to mark initialization as // having completed. // Note: the ClientConfigurationSystem has a 2-stage initialization, // and that's why s_initState isn't set to InitState.Completed yet. s_configSystem = new ClientConfigurationSystem(); s_initState = InitState.Usable; } catch (Exception e) { s_initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error), e); throw s_initError; } } catch { s_initState = InitState.Completed; throw; } } } } // Set the initialization error. internal static void SetInitError(Exception initError) { s_initError = initError; } // Mark intiailization as having completed. internal static void CompleteConfigInit() { lock (s_initLock) { s_initState = InitState.Completed; } } private static void PrepareConfigSystem() { // Ensure the configuration system is usable. if (s_initState < InitState.Usable) { EnsureConfigurationSystem(); } // If there was an initialization error, throw it. if (s_initError != null) { throw s_initError; } } internal static bool SupportsUserConfig { get { PrepareConfigSystem(); return s_configSystem.SupportsUserConfig; } } // // ************************************************* // ** Static Runtime Functions to retrieve config ** // ************************************************* // public static NameValueCollection AppSettings { get { object section = GetSection("appSettings"); if (section == null || !(section is NameValueCollection)) { // If config is null or not the type we expect, the declaration was changed. // Treat it as a configuration error. throw new ConfigurationErrorsException(SR.GetString(SR.Config_appsettings_declaration_invalid)); } return (NameValueCollection) section; } } public static ConnectionStringSettingsCollection ConnectionStrings { get { object section = GetSection("connectionStrings"); // Verify type, and return the collection if (section == null || section.GetType() != typeof(ConnectionStringsSection)) { // If config is null or not the type we expect, the declaration was changed. // Treat it as a configuration error. throw new ConfigurationErrorsException(SR.GetString(SR.Config_connectionstrings_declaration_invalid)); } ConnectionStringsSection connectionStringsSection = (ConnectionStringsSection) section; return connectionStringsSection.ConnectionStrings; } } // GetSection // // Retrieve a Section from the configuration system // public static object GetSection(string sectionName) { // Avoid unintended AV's by ensuring sectionName is not empty. // For compatibility, we cannot throw an InvalidArgumentException. if (String.IsNullOrEmpty(sectionName)) { return null; } PrepareConfigSystem(); object section = s_configSystem.GetSection(sectionName); return section; } public static void RefreshSection(string sectionName) { // Avoid unintended AV's by ensuring sectionName is not empty. // For consistency with GetSection, we should not throw an InvalidArgumentException. if (String.IsNullOrEmpty(sectionName)) { return; } PrepareConfigSystem(); s_configSystem.RefreshConfig(sectionName); } // // ************************************************* // ** Static Management Functions to edit config ** // ************************************************* // // // OpenMachineConfiguration // public static Configuration OpenMachineConfiguration() { return OpenExeConfigurationImpl(null, true, ConfigurationUserLevel.None, null); } public static Configuration OpenMappedMachineConfiguration(ConfigurationFileMap fileMap) { return OpenExeConfigurationImpl(fileMap, true, ConfigurationUserLevel.None, null); } // // OpenExeConfiguration // public static Configuration OpenExeConfiguration(ConfigurationUserLevel userLevel) { return OpenExeConfigurationImpl(null, false, userLevel, null); } public static Configuration OpenExeConfiguration(string exePath) { return OpenExeConfigurationImpl(null, false, ConfigurationUserLevel.None, exePath); } public static Configuration OpenMappedExeConfiguration(ExeConfigurationFileMap fileMap, ConfigurationUserLevel userLevel) { return OpenExeConfigurationImpl(fileMap, false, userLevel, null); } private static Configuration OpenExeConfigurationImpl(ConfigurationFileMap fileMap, bool isMachine, ConfigurationUserLevel userLevel, string exePath) { // exePath must be specified if not running inside ClientConfigurationSystem if ( !isMachine && ( ( ( fileMap == null ) && ( exePath == null ) ) || ( ( fileMap != null ) && ( ( ( ExeConfigurationFileMap ) fileMap ).ExeConfigFilename == null ) ) ) ) { if ( ( s_configSystem != null ) && ( s_configSystem.GetType() != typeof( ClientConfigurationSystem ) ) ) { throw new ArgumentException(SR.GetString(SR.Config_configmanager_open_noexe)); } } return ClientConfigurationHost.OpenExeConfiguration(fileMap, isMachine, userLevel, exePath); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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