AttributeCollection.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 / AttributeCollection.cs / 1 / AttributeCollection.cs
                        

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

/* 
 * AttributeCollection.cs 
 *
 * Copyright (c) 2000 Microsoft Corporation 
 */

namespace System.Web.UI {
    using System.IO; 
    using System.Collections;
    using System.Reflection; 
    using System.Web.UI; 
    using System.Globalization;
    using System.Security.Permissions; 
    using System.Web.Util;

/*
 * The AttributeCollection represents Attributes on an Html control. 
 */
 
///  
///    
///       The  class provides object-model access 
///       to all attributes declared on an HTML server control element.
///    
/// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public sealed class AttributeCollection {
        private StateBag _bag; 
        private CssStyleCollection _styleColl; 

        /* 
         *      Constructs an AttributeCollection given a StateBag.
         */

        ///  
        /// 
        public AttributeCollection(StateBag bag) { 
            _bag = bag; 
        }
 
        /*
         * Automatically adds new keys.
         */
 
        /// 
        ///     
        ///       Gets or sets a specified attribute value. 
        ///    
        ///  
        public string this[string key]
        {
            get {
                if (_styleColl != null && StringUtil.EqualsIgnoreCase(key, "style")) 
                    return _styleColl.Value;
                else 
                    return _bag[key] as string; 
            }
            set { 
                Add(key, value);
            }
        }
 
        /*
         * Returns a collection of keys. 
         */ 

        ///  
        ///    
        ///       Gets a collection of keys to all the attributes in the
        ///    .
        ///     
        /// 
        public ICollection Keys { 
            get { 
                return _bag.Keys;
            } 
        }


        ///  
        ///    
        ///       Gets the number of items in the . 
        ///     
        /// 
        public int Count { 
            get {
                return _bag.Count;
            }
        } 

 
        ///  
        /// 
        public CssStyleCollection CssStyle { 
            get {
                if (_styleColl == null) {
                    _styleColl = new CssStyleCollection(_bag);
                } 
                return _styleColl;
            } 
        } 

 
        /// 
        ///    
        ///       Adds an item to the .
        ///     
        /// 
        public void Add(string key, string value) { 
            if (_styleColl != null && StringUtil.EqualsIgnoreCase(key, "style")) 
                _styleColl.Value = value;
            else 
                _bag[key] = value;
        }

        public override bool Equals(object o) { 
            // This implementation of Equals relies on mutable properties and is therefore broken,
            // but we shipped it this way in V1 so it will be a breaking change to fix it. 
            AttributeCollection attrs = o as AttributeCollection; 

            if (attrs != null) { 
                if (attrs.Count != _bag.Count) {
                    return false;
                }
                foreach (DictionaryEntry attr in _bag) { 
                    if (this[(string)attr.Key] != attrs[(string)attr.Key]) {
                        return false; 
                    } 
                }
                return true; 
            }
            return false;
        }
 
        public override int GetHashCode() {
            // This implementation of GetHashCode uses mutable properties but matches the V1 implementation 
            // of Equals. 
            HashCodeCombiner hashCodeCombiner = new HashCodeCombiner();
            foreach (DictionaryEntry attr in _bag) { 
                hashCodeCombiner.AddObject(attr.Key);
                hashCodeCombiner.AddObject(attr.Value);
            }
            return hashCodeCombiner.CombinedHash32; 
        }
 
 
        /// 
        ///     
        ///       Removes an attribute from the .
        ///    
        /// 
        public void Remove(string key) { 
            if (_styleColl != null && StringUtil.EqualsIgnoreCase(key, "style"))
                _styleColl.Clear(); 
            else 
                _bag.Remove(key);
        } 


        /// 
        ///     
        ///       Removes all attributes from the .
        ///     
        ///  
        public void Clear() {
            _bag.Clear(); 
            if (_styleColl != null)
                _styleColl.Clear();
        }
 

        ///  
        ///    [To be supplied.] 
        /// 
        public void Render(HtmlTextWriter writer) { 
            if (_bag.Count > 0) {
                IDictionaryEnumerator e = _bag.GetEnumerator();

                while (e.MoveNext()) { 
                    StateItem item = e.Value as StateItem;
                    if (item != null) { 
                        string value = item.Value as string; 
                        string key = e.Key as string;
                        if (key != null && value != null) { 
                            writer.WriteAttribute(key, value, true /*fEncode*/);
                        }
                    }
                } 
            }
        } 
 

        ///  
        ///    [To be supplied.]
        /// 
        public void AddAttributes(HtmlTextWriter writer) {
            if (_bag.Count > 0) { 
                IDictionaryEnumerator e = _bag.GetEnumerator();
 
                while (e.MoveNext()) { 
                    StateItem item = e.Value as StateItem;
                    if (item != null) { 
                        string value = item.Value as string;
                        string key = e.Key as string;
                        if (key != null && value != null) {
                            writer.AddAttribute(key, value, true /*fEncode*/); 
                        }
                    } 
                } 
            }
        } 
    }
}

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