ConfigurationSectionCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / ConfigurationSectionCollection.cs / 1305376 / ConfigurationSectionCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Configuration { 
    using System.Collections; 
    using System.Collections.Specialized;
    using System.Runtime.Serialization; 
    using System.Security.Permissions;

    [Serializable()]
    public sealed class ConfigurationSectionCollection : NameObjectCollectionBase { 

        private MgmtConfigurationRecord     _configRecord; 
        private ConfigurationSectionGroup   _configSectionGroup; 

        // 
        // Create the collection of all sections in the section group.
        //
        internal ConfigurationSectionCollection(MgmtConfigurationRecord configRecord, ConfigurationSectionGroup configSectionGroup) :
                base(StringComparer.Ordinal) { 

            _configRecord = configRecord; 
            _configSectionGroup = configSectionGroup; 

            foreach (DictionaryEntry de in _configRecord.SectionFactories) { 
                FactoryId factoryId = (FactoryId) de.Value;
                if (factoryId.Group == _configSectionGroup.SectionGroupName) {
                    BaseAdd(factoryId.Name, factoryId.Name);
                } 
            }
        } 
 
        [SecurityPermissionAttribute(SecurityAction.Demand,SerializationFormatter=true)]
        public override void GetObjectData(SerializationInfo info, StreamingContext context) { 
            base.GetObjectData(info, context);
        }

        // 
        // Remove the collection from configuration system, and remove all entries
        // in the base collection so that enumeration will return an empty collection. 
        // 
        internal void DetachFromConfigurationRecord() {
            _configRecord = null; 
            BaseClear();
        }

        private void VerifyIsAttachedToConfigRecord() { 
            if (_configRecord == null) {
                throw new InvalidOperationException(SR.GetString(SR.Config_cannot_edit_configurationsectiongroup_when_not_attached)); 
            } 
        }
 
        //
        // Public Properties
        //
 
        // Indexer via name
        public ConfigurationSection this[string name] { 
            get { 
                return Get(name);
            } 
        }

        // Indexer via integer index.
        public ConfigurationSection this[int index] { 
            get {
                return Get(index); 
            } 
        }
 
        //
        // Public methods
        //
 
        //
        // Add a new section to the collection. This will result in a new declaration and definition. 
        // 
        // It is an error if the section already exists.
        // 
        public void Add(string name, ConfigurationSection section) {
            VerifyIsAttachedToConfigRecord();

            _configRecord.AddConfigurationSection(_configSectionGroup.SectionGroupName, name, section); 
            BaseAdd(name, name);
        } 
 
        //
        // Remove all sections from the collection. 
        //
        public void Clear() {
            VerifyIsAttachedToConfigRecord();
 
            string[] allKeys = BaseGetAllKeys();
            foreach (string key in allKeys) { 
                Remove(key); 
            }
        } 

        //
        // Return the number of sections in the collection.
        // 
        public override int Count {
            get { 
                return base.Count; 
            }
        } 

        //
        // Copy all the sections to an array.
        // 
        public void CopyTo(ConfigurationSection[] array, int index) {
            if (array == null) { 
                throw new ArgumentNullException("array"); 
            }
 
            int c = Count;
            if (array.Length < c + index) {
                throw new ArgumentOutOfRangeException("index");
            } 

            for (int i = 0, j = index; i < c; i++, j++) { 
                array[j] = Get(i); 
            }
        } 

        //
        // Get the section at a given index.
        // 
        public ConfigurationSection Get(int index) {
            return Get(GetKey(index)); 
        } 

        // 
        // Get the section with a given name.
        //
        public ConfigurationSection Get(string name) {
            VerifyIsAttachedToConfigRecord(); 

            // validate name 
            if (String.IsNullOrEmpty(name)) 
                throw ExceptionUtil.ParameterNullOrEmpty("name");
 
            // prevent GetConfig from returning config not in this collection
            if (name.IndexOf('/') >= 0)
                return null;
 
            // get the section from the config record
            string configKey = BaseConfigurationRecord.CombineConfigKey(_configSectionGroup.SectionGroupName, name); 
            return (ConfigurationSection)_configRecord.GetSection(configKey); 
        }
 
        // Get an enumerator
        public override IEnumerator GetEnumerator() {
            int c = Count;
            for (int i = 0; i < c; i++) { 
                yield return this[i];
            } 
        } 

        // Get the string key at a given index. 
        public string GetKey(int index) {
            return BaseGetKey(index);
        }
 
        // Return the string keys of the collection.
        public override KeysCollection Keys { 
            get { 
                return base.Keys;
            } 
        }

        //
        // Remove the declaration and definition of a section in this config file, including any 
        // location sections in the file.
        // 
        // Note that if the section is declared in a parent, we still remove the declaration and 
        // definition, and the instance of ConfigurationSection will be detached from the collection.
        // However, the collection will still have a ConfigurationSection of that name in the collection, 
        // only it will have the value of the immediate parent.
        //
        public void Remove(string name) {
            VerifyIsAttachedToConfigRecord(); 

            // 
            // Remove the factory and section from this record, so that when config is written, 
            // it will contain neither a declaration or definition.
            // 
            _configRecord.RemoveConfigurationSection(_configSectionGroup.SectionGroupName, name);

            //
            // Remove the section from the collection if it is no longer in the list of all SectionFactories. 
            //
            string configKey = BaseConfigurationRecord.CombineConfigKey(_configSectionGroup.SectionGroupName, name); 
            if (!_configRecord.SectionFactories.Contains(configKey)) { 
                BaseRemove(name);
            } 
        }

        //
        // Remove the section at that index. 
        //
        public void RemoveAt(int index) { 
            VerifyIsAttachedToConfigRecord(); 

            Remove(GetKey(index)); 
        }
    }
}

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

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