FilterableAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / FilterableAttribute.cs / 1305376 / 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; 

    ///  
    ///  
    /// 
    [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; 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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