AspNetHostingPermission.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / Security / Permissions / AspNetHostingPermission.cs / 1305376 / AspNetHostingPermission.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web { 
 
    using System.Security;
    using System.Security.Permissions; 
    using System.Globalization;

    //NOTE: While AspNetHostingPermissionAttribute resides in System.DLL,
    //      no classes from that DLL are able to make declarative usage of AspNetHostingPermission. 

    [Serializable] 
    public enum AspNetHostingPermissionLevel 
    {
        None            = 100, 
        Minimal         = 200,
        Low             = 300,
        Medium          = 400,
        High            = 500, 
        Unrestricted    = 600
    } 
 
    [AttributeUsage(AttributeTargets.All, AllowMultiple=true, Inherited=false )]
    [Serializable] 
    sealed public class AspNetHostingPermissionAttribute : CodeAccessSecurityAttribute
    {
        AspNetHostingPermissionLevel    _level;
 
        public AspNetHostingPermissionAttribute ( SecurityAction action ) : base( action ) {
            _level = AspNetHostingPermissionLevel.None; 
        } 

        public AspNetHostingPermissionLevel Level { 
            get {
                return _level;
            }
 
            set {
                AspNetHostingPermission.VerifyAspNetHostingPermissionLevel(value, "Level"); 
                _level = value; 
            }
        } 

        public override IPermission CreatePermission() {
            if (Unrestricted) {
                return new AspNetHostingPermission(PermissionState.Unrestricted); 
            }
            else { 
                return new AspNetHostingPermission(_level); 
            }
        } 
    }


    ///  
    ///    
    ///     
    ///  
    [Serializable]
    public sealed class AspNetHostingPermission :  CodeAccessPermission, IUnrestrictedPermission { 
        AspNetHostingPermissionLevel    _level;

        static internal void VerifyAspNetHostingPermissionLevel(AspNetHostingPermissionLevel level, string arg) {
            switch (level) { 
            case AspNetHostingPermissionLevel.Unrestricted:
            case AspNetHostingPermissionLevel.High: 
            case AspNetHostingPermissionLevel.Medium: 
            case AspNetHostingPermissionLevel.Low:
            case AspNetHostingPermissionLevel.Minimal: 
            case AspNetHostingPermissionLevel.None:
                break;

            default: 
                throw new ArgumentException(arg);
            } 
        } 

        ///  
        ///    
        ///       Creates a new instance of the System.Net.AspNetHostingPermission
        ///       class that passes all demands or that fails all demands.
        ///     
        /// 
        public AspNetHostingPermission(PermissionState state) { 
            switch (state) { 
            case PermissionState.Unrestricted:
                _level = AspNetHostingPermissionLevel.Unrestricted; 
                break;

            case PermissionState.None:
                _level = AspNetHostingPermissionLevel.None; 
                break;
 
            default: 
                throw new ArgumentException(SR.GetString(SR.InvalidArgument, state.ToString(), "state"));
            } 
        }

        public AspNetHostingPermission(AspNetHostingPermissionLevel level) {
            VerifyAspNetHostingPermissionLevel(level, "level"); 
            _level = level;
        } 
 
        public AspNetHostingPermissionLevel Level {
            get { 
                return _level;
            }

            set { 
                VerifyAspNetHostingPermissionLevel(value, "Level");
                _level = value; 
            } 
        }
 
        // IUnrestrictedPermission interface methods
        /// 
        ///    
        ///       Checks the overall permission state of the object. 
        ///    
        ///  
        public bool IsUnrestricted() { 
            return _level == AspNetHostingPermissionLevel.Unrestricted;
        } 

        // IPermission interface methods
        /// 
        ///     
        ///       Creates a copy of a System.Net.AspNetHostingPermission
        ///     
        ///  
        public override IPermission Copy () {
            return new AspNetHostingPermission(_level); 
        }

        /// 
        /// Returns the logical union between two System.Net.AspNetHostingPermission instances. 
        /// 
        public override IPermission Union(IPermission target) { 
            if (target == null) { 
                return Copy();
            } 

            if (target.GetType() !=  typeof(AspNetHostingPermission)) {
                throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target"));
            } 

            AspNetHostingPermission other = (AspNetHostingPermission) target; 
            if (Level >= other.Level) { 
                return new AspNetHostingPermission(Level);
            } 
            else {
                return new AspNetHostingPermission(other.Level);
            }
        } 

        ///  
        /// Returns the logical intersection between two System.Net.AspNetHostingPermission instances. 
        /// 
        public override IPermission Intersect(IPermission target) { 
            if (target == null) {
                return null;
            }
 
            if (target.GetType() !=  typeof(AspNetHostingPermission)) {
                throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target")); 
            } 

            AspNetHostingPermission other = (AspNetHostingPermission) target; 
            if (Level <= other.Level) {
                return new AspNetHostingPermission(Level);
            }
            else { 
                return new AspNetHostingPermission(other.Level);
            } 
        } 

 
        /// 
        /// Compares two System.Net.AspNetHostingPermission instances.
        /// 
        public override bool IsSubsetOf(IPermission target) { 
            if (target == null) {
                return _level == AspNetHostingPermissionLevel.None; 
            } 

            if (target.GetType() != typeof(AspNetHostingPermission)) { 
                throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target"));
            }

            AspNetHostingPermission other = (AspNetHostingPermission) target; 
            return Level <= other.Level;
        } 
 
        /// 
        ///  
        public override void FromXml(SecurityElement securityElement) {
            if (securityElement == null) {
                throw new ArgumentNullException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement"));
            } 

            if (!securityElement.Tag.Equals("IPermission")) { 
                throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); 
            }
 
            string className = securityElement.Attribute("class");
            if (className == null) {
                throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement"));
            } 

            if (className.IndexOf(this.GetType().FullName, StringComparison.Ordinal) < 0) { 
                throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); 
            }
 
            string version = securityElement.Attribute("version");
            if (string.Compare(version, "1", StringComparison.OrdinalIgnoreCase) != 0) {
                throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"version"));
            } 

            string level = securityElement.Attribute("Level"); 
            if (level == null) { 
                _level = AspNetHostingPermissionLevel.None;
            } 
            else {
                _level = (AspNetHostingPermissionLevel) Enum.Parse(typeof(AspNetHostingPermissionLevel), level);
            }
        } 

        ///  
        ///    [To be supplied.] 
        /// 
        public override SecurityElement ToXml() { 
            SecurityElement securityElement = new SecurityElement("IPermission");
            securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace( '\"', '\'' ));
            securityElement.AddAttribute("version", "1" );
            securityElement.AddAttribute("Level", Enum.GetName(typeof(AspNetHostingPermissionLevel), _level)); 
            if (IsUnrestricted()) {
                securityElement.AddAttribute("Unrestricted", "true"); 
            } 

            return securityElement; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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AspNetHostingPermission.cs source code in C# .NET

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