ThemeableAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ThemeableAttribute.cs / 1 / ThemeableAttribute.cs
                        

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

/* 
 */ 
namespace System.Web.UI {
 
    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Security.Permissions; 

    ///  
    ///  
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)]
    public sealed class ThemeableAttribute : Attribute {

        ///  
        /// 
        ///  
        ///  
        public static readonly ThemeableAttribute Yes = new ThemeableAttribute(true);
 
        /// 
        /// 
        /// 
        ///  
        public static readonly ThemeableAttribute No = new ThemeableAttribute(false);
 
        ///  
        /// 
        ///  
        /// 
        public static readonly ThemeableAttribute Default = Yes;

        private bool _themeable = false; 
        private static Hashtable _themeableTypes;
 
        static ThemeableAttribute() { 
            // Create a synchronized wrapper
            _themeableTypes = Hashtable.Synchronized(new Hashtable()); 
        }

        /// 
        ///  
        public ThemeableAttribute(bool themeable) {
            _themeable = themeable; 
        } 

        ///  
        ///     Indicates if the property is themeable.
        /// 
        public bool Themeable {
            get { 
                return _themeable;
            } 
        } 

        ///  
        public override bool Equals(object obj) {
            if (obj == this) {
                return true;
            } 

            ThemeableAttribute other = obj as ThemeableAttribute; 
            return (other != null) && (other.Themeable == _themeable); 
        }
 
        /// 
        public override int GetHashCode() {
            return _themeable.GetHashCode();
        } 

        ///  
        public override bool IsDefaultAttribute() { 
            return this.Equals(Default);
        } 

        public static bool IsObjectThemeable(Object instance) {
            if (instance == null)
                throw new ArgumentNullException("instance"); 

            return IsTypeThemeable(instance.GetType()); 
        } 

        public static bool IsTypeThemeable(Type type) { 
            if (type == null)
                throw new ArgumentNullException("type");

            object result = _themeableTypes[type]; 
            if (result != null) {
                return (bool)result; 
            } 

            System.ComponentModel.AttributeCollection attrs = TypeDescriptor.GetAttributes(type); 
            ThemeableAttribute attr = (ThemeableAttribute)attrs[typeof(ThemeableAttribute)];
            result = (attr != null) && attr.Themeable;
            _themeableTypes[type] = result;
 
            return (bool)result;
        } 
    } 
}

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