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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