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