FilterableAttribute.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / FilterableAttribute.cs / 1 / FilterableAttribute.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 FilterableAttribute : Attribute {

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

        private bool _filterable = false; 
        private static Hashtable _filterableTypes;
 
        static FilterableAttribute() { 
            // Create a synchronized wrapper
            _filterableTypes = Hashtable.Synchronized(new Hashtable()); 
        }

        /// 
        ///  
        public FilterableAttribute(bool filterable) {
            _filterable = filterable; 
        } 

        ///  
        ///     Indicates if the property is Filterable.
        /// 
        public bool Filterable {
            get { 
                return _filterable;
            } 
        } 

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

            FilterableAttribute other = obj as FilterableAttribute; 
            return (other != null) && (other.Filterable == _filterable); 
        }
 
        /// 
        public override int GetHashCode() {
            return _filterable.GetHashCode();
        } 

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

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

            return IsTypeFilterable(instance.GetType()); 
        } 

        public static bool IsPropertyFilterable(PropertyDescriptor propertyDescriptor) { 
            FilterableAttribute filterableAttr = (FilterableAttribute)propertyDescriptor.Attributes[typeof(FilterableAttribute)];
            if (filterableAttr != null) {
                return filterableAttr.Filterable;
            } 

            return true; 
        } 

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

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

            System.ComponentModel.AttributeCollection attrs = TypeDescriptor.GetAttributes(type); 
            FilterableAttribute attr = (FilterableAttribute)attrs[typeof(FilterableAttribute)];
            result = (attr != null) && attr.Filterable;
            _filterableTypes[type] = result;
 
            return (bool)result;
        } 
    } 
}
                        

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