serverconfig.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Configuration / serverconfig.cs / 4 / serverconfig.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Configuration { 
 
    using System.Configuration;
    using System.Collections; 
    using System.Globalization;
    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 { 
            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.ApplicationHost 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; 
            }
        } 

    }
}

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