HttpSysSettings.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / HttpSysSettings.cs / 1305376 / HttpSysSettings.cs
                        

                        
                            using System; 
using System.Diagnostics;
using System.Text;
using System.Collections.Generic;
using System.Globalization; 
using System.Security.Permissions;
using Microsoft.Win32; 
using System.IO; 
using System.Security;
 
namespace System.Net
{
    internal static class HttpSysSettings
    { 
        private const string httpSysParametersKey = @"System\CurrentControlSet\Services\HTTP\Parameters";
        private const bool enableNonUtf8Default = true; 
        private const bool favorUtf8Default = true; 
        private const string enableNonUtf8Name = "EnableNonUtf8";
        private const string favorUtf8Name = "FavorUtf8"; 

        private static bool enableNonUtf8;
        private static bool favorUtf8;
 
        static HttpSysSettings()
        { 
            enableNonUtf8 = enableNonUtf8Default; 
            favorUtf8 = favorUtf8Default;
            ReadHttpSysRegistrySettings(); 
        }

        public static bool EnableNonUtf8
        { 
            get { return enableNonUtf8; }
        } 
 
        public static bool FavorUtf8
        { 
            get { return favorUtf8; }
        }

        [RegistryPermission(SecurityAction.Assert, Read = @"HKEY_LOCAL_MACHINE\" + httpSysParametersKey)] 
        private static void ReadHttpSysRegistrySettings()
        { 
            try 
            {
                RegistryKey httpSysParameters = Registry.LocalMachine.OpenSubKey(httpSysParametersKey); 

                if (httpSysParameters == null)
                {
                    LogWarning("ReadHttpSysRegistrySettings", SR.net_log_listener_httpsys_registry_null, 
                        httpSysParametersKey);
                } 
                else 
                {
                    using (httpSysParameters) 
                    {
                        enableNonUtf8 = ReadRegistryValue(httpSysParameters, enableNonUtf8Name, enableNonUtf8Default);
                        favorUtf8 = ReadRegistryValue(httpSysParameters, favorUtf8Name, favorUtf8Default);
                    } 
                }
            } 
            catch (SecurityException e) 
            {
                LogRegistryException("ReadHttpSysRegistrySettings", e); 
            }
            catch (ObjectDisposedException e)
            {
                LogRegistryException("ReadHttpSysRegistrySettings", e); 
            }
        } 
 
        private static bool ReadRegistryValue(RegistryKey key, string valueName, bool defaultValue)
        { 
            Debug.Assert(key != null, "'key' must not be null");

            try
            { 
                // This check will throw an IOException if keyName doesn't exist. That's OK, we return the
                // default value. 
                if (key.GetValueKind(valueName) == RegistryValueKind.DWord) 
                {
                    // At this point we know the Registry value exists and it must be valid (any DWORD value 
                    // can be converted to a bool).
                    return Convert.ToBoolean(key.GetValue(valueName), CultureInfo.InvariantCulture);
                }
            } 
            catch (UnauthorizedAccessException e)
            { 
                LogRegistryException("ReadRegistryValue", e); 
            }
            catch (IOException e) 
            {
                LogRegistryException("ReadRegistryValue", e);
            }
            catch (SecurityException e) 
            {
                LogRegistryException("ReadRegistryValue", e); 
            } 
            catch (ObjectDisposedException e)
            { 
                LogRegistryException("ReadRegistryValue", e);
            }

            return defaultValue; 
        }
 
        private static void LogRegistryException(string methodName, Exception e) 
        {
            LogWarning(methodName, SR.net_log_listener_httpsys_registry_error, httpSysParametersKey, e); 
        }

        private static void LogWarning(string methodName, string message, params object[] args)
        { 
            if (Logging.On)
            { 
                Logging.PrintWarning(Logging.HttpListener, typeof(HttpSysSettings), methodName, 
                    SR.GetString(message, args));
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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