serverconfig.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / 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.
//------------------------------------------------------------------------------ 
// 
//     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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serverconfig.cs source code in C# .NET

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