ConfigurationManager.cs source code in C# .NET

                        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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