System.Security.Util.XMLUtil.CreateMembershipCondition C# (CSharp) Method

        CreateMembershipCondition( SecurityElement el )
        {
            if (el == null || !el.Tag.Equals("IMembershipCondition"))
                throw new ArgumentException( String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Argument_WrongElementType" ), "<IMembershipCondition>" ) ) ;
    
            String className;
            int classNameStart;
            int classNameLength;
            
            if (!ParseElementForObjectCreation( el,
                                                BuiltInMembershipCondition,
                                                out className,
                                                out classNameStart,
                                                out classNameLength ))
            {
                goto USEREFLECTION;
            }

            // We have a built in membership condition, figure out which it is.
                    
            // Here's the list of built in membership conditions as of 9/17/2002
            // System.Security.Policy.AllMembershipCondition
            // System.Security.Policy.URLMembershipCondition
            // System.Security.Policy.SHA1MembershipCondition
            // System.Security.Policy.SiteMembershipCondition
            // System.Security.Policy.ZoneMembershipCondition                                                                                                                                                              
            // System.Security.Policy.PublisherMembershipCondition
            // System.Security.Policy.StrongNameMembershipCondition
            // System.Security.Policy.ApplicationMembershipCondition
            // System.Security.Policy.DomainApplicationMembershipCondition
            // System.Security.Policy.ApplicationDirectoryMembershipCondition
                    
            switch (classNameLength)
            {
                case 22:
                    // AllMembershipCondition
                    // URLMembershipCondition
                    if (className[classNameStart] == 'A')
                    {
                        if (String.Compare(className, classNameStart, "AllMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                            return new AllMembershipCondition();
                        else
                            goto USEREFLECTION;
                    }
                    else
                    {
                        if (String.Compare(className, classNameStart, "UrlMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                            return new UrlMembershipCondition();
                        else
                            goto USEREFLECTION;
                    }
                                
                case 23:
                    // SiteMembershipCondition
                    // ZoneMembershipCondition                                                                                                                                                              
                    if (className[classNameStart] == 'S')
                    {
                        if (String.Compare(className, classNameStart, "SiteMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                            return new SiteMembershipCondition();
                        else
                            goto USEREFLECTION;
                    }
                    else
                    {
                        if (String.Compare(className, classNameStart, "ZoneMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                            return new ZoneMembershipCondition();
                        else
                            goto USEREFLECTION;
                    }

                case 28:
                        goto USEREFLECTION;

                case 29:
                    // StrongNameMembershipCondition
                    if (String.Compare(className, classNameStart, "StrongNameMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                        return new StrongNameMembershipCondition();
                    else
                        goto USEREFLECTION;

                case 39:
                    // ApplicationDirectoryMembershipCondition
                    if (String.Compare(className, classNameStart, "ApplicationDirectoryMembershipCondition", 0, classNameLength, StringComparison.Ordinal) == 0)
                        return new ApplicationDirectoryMembershipCondition();
                    else
                        goto USEREFLECTION;

                default:
                    goto USEREFLECTION;
            }

USEREFLECTION:
            Type condClass = null;
            IMembershipCondition cond = null;
    
            new ReflectionPermission(ReflectionPermissionFlag.MemberAccess).Assert();
            condClass = GetClassFromElement(el, true);
            if (condClass == null)
                return null;
            if (!(typeof(IMembershipCondition).IsAssignableFrom(condClass)))
                throw new ArgumentException( Environment.GetResourceString("Argument_NotAMembershipCondition") );

            cond = (IMembershipCondition) Activator.CreateInstance(condClass, true);

            return cond;
        }