Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Configuration / serverconfig.cs / 1305376 / serverconfig.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Configuration { using System.Configuration; using System.Collections; using System.Globalization; using System.Security; using System.Security.Permissions; using System.Text; using System.Threading; using System.Web.Util; using System.Web.Hosting; using System.Web.Caching; using System.Web.Compilation; using Microsoft.Win32; // // Abstracts differences between config retreived from IIS 6 metabase // and config retreived from new IIS7 configuration system. // static internal class ServerConfig { static int s_iisMajorVersion = 0; internal static bool UseMetabase { [RegistryPermissionAttribute(SecurityAction.Assert, Read = "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\InetStp")] get { if (s_iisMajorVersion == 0) { int version; try { object ver = Registry.GetValue("HKEY_LOCAL_MACHINE\\Software\\Microsoft\\InetStp", "MajorVersion", 0); version = (ver != null) ? (int) ver : -1; } catch (ArgumentException) { // Ignore ArgumentException from Registry.GetValue. This may indicate that the key does not exist, i.e. IIS not installed version = -1; // Key not found } Interlocked.CompareExchange(ref s_iisMajorVersion, version, 0); } return s_iisMajorVersion <= 6; } } static internal IServerConfig GetInstance() { // IIS 7 bits on <= IIS 6: use the metabase if (UseMetabase) { return MetabaseServerConfig.GetInstance(); } return ProcessHostServerConfig.GetInstance(); } // // Return true in cases where web server configuration should be used // to resolve paths. // static int s_useServerConfig = -1; static internal bool UseServerConfig { get { if (s_useServerConfig == -1) { int useServerConfig = 0; // Must use web server config if there is no hosting environment if (!HostingEnvironment.IsHosted) { useServerConfig = 1; } // Hosting environment is the web server else if (HostingEnvironment.ApplicationHostInternal is ISAPIApplicationHost) { useServerConfig = 1; } // Hosting environment is the web server else if (HostingEnvironment.IsUnderIISProcess && !BuildManagerHost.InClientBuildManager) { useServerConfig = 1; } Interlocked.CompareExchange(ref s_useServerConfig, useServerConfig, -1); } return s_useServerConfig == 1; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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