SwitchElementsCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / Diagnostics / SwitchElementsCollection.cs / 1305376 / SwitchElementsCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
using System.Configuration;
using System.Collections; 
using System.Collections.Specialized; 
using System.Xml;
 
namespace System.Diagnostics {
    [ConfigurationCollection(typeof(SwitchElement))]
    internal class SwitchElementsCollection : ConfigurationElementCollection {
 
        new public SwitchElement this[string name] {
            get { 
                return (SwitchElement) BaseGet(name); 
            }
        } 

        public override ConfigurationElementCollectionType CollectionType {
            get {
                return ConfigurationElementCollectionType.AddRemoveClearMap; 
            }
        } 
 
        protected override ConfigurationElement CreateNewElement() {
            return new SwitchElement(); 
        }

        protected override Object GetElementKey(ConfigurationElement element) {
            return ((SwitchElement) element).Name; 
        }
    } 
 
    internal class SwitchElement : ConfigurationElement {
        private static readonly ConfigurationPropertyCollection _properties; 
        private static readonly ConfigurationProperty _propName = new ConfigurationProperty("name", typeof(string), "", ConfigurationPropertyOptions.IsRequired | ConfigurationPropertyOptions.IsKey);
        private static readonly ConfigurationProperty _propValue = new ConfigurationProperty("value", typeof(string), null, ConfigurationPropertyOptions.IsRequired);

        private Hashtable _attributes; 

        static SwitchElement(){ 
            _properties = new ConfigurationPropertyCollection(); 
            _properties.Add(_propName);
            _properties.Add(_propValue); 
        }

        public Hashtable Attributes {
            get { 
                if (_attributes == null)
                    _attributes = new Hashtable(StringComparer.OrdinalIgnoreCase); 
                return _attributes; 
            }
        } 

        [ConfigurationProperty("name", DefaultValue = "", IsRequired = true, IsKey = true)]
        public string Name {
            get { 
                return (string) this[_propName];
            } 
        } 

        protected override ConfigurationPropertyCollection Properties { 
            get {
                return _properties;
            }
        } 

        [ConfigurationProperty("value", IsRequired = true)] 
        public string Value { 
            get {
                return (string) this[_propValue]; 
            }
        }

        // Our optional attributes implementation is little convoluted as there is 
        // no such firsclass mechanism from the config system. We basically cache
        // any "unrecognized" attribute here and serialize it out later. 
        protected override bool OnDeserializeUnrecognizedAttribute(String name, String value) { 
            Attributes.Add(name, value);
            return true; 
        }

        // We need to serialize optional attributes here, a better place would have
        // been inside SerializeElement but the base class implementation from 
        // ConfigurationElement doesn't take into account for derived class doing
        // extended serialization, it basically writes out child element that 
        // forces the element closing syntax, so any attribute serialization needs 
        // to happen before normal element serialization from ConfigurationElement.
        // This means we would write out custom attributes ahead of normal ones. 
        // The other alternative would be to re-implement the entire routine here
        // which is an overkill and a maintenance issue.
        protected override void PreSerialize(XmlWriter writer) {
            if (_attributes != null) { 
                IDictionaryEnumerator e = _attributes.GetEnumerator();
                while (e.MoveNext()) { 
                    string xmlValue = (string)e.Value; 
                    string xmlName = (string)e.Key;
 
                    if ((xmlValue != null) && (writer != null)) {
                        writer.WriteAttributeString(xmlName, xmlValue);
                    }
                } 
            }
        } 
 
        // Account for optional attributes from custom listeners.
        protected override bool SerializeElement(XmlWriter writer, bool serializeCollectionKey) { 
            bool DataToWrite = base.SerializeElement(writer, serializeCollectionKey);
            DataToWrite = DataToWrite || ((_attributes != null) && (_attributes.Count > 0));
            return DataToWrite;
        } 

        protected override void Unmerge(ConfigurationElement sourceElement, 
                                                ConfigurationElement parentElement, 
                                                ConfigurationSaveMode saveMode) {
            base.Unmerge(sourceElement, parentElement, saveMode); 

            // Unmerge the optional attributes cache as well
            SwitchElement le = sourceElement as SwitchElement;
            if ((le != null) && (le._attributes != null)) 
                this._attributes = le._attributes;
        } 
 
        internal void ResetProperties()
        { 
            // blow away any UnrecognizedAttributes that we have deserialized earlier
            if (_attributes != null) {
                _attributes.Clear();
                _properties.Clear(); 
                _properties.Add(_propName);
                _properties.Add(_propValue); 
            } 
        }
    } 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SwitchElementsCollection.cs source code in C# .NET

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