ConfigurationSectionGroupCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / ConfigurationSectionGroupCollection.cs / 1305376 / ConfigurationSectionGroupCollection.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 ConfigurationSectionGroupCollection : NameObjectCollectionBase { 

        private MgmtConfigurationRecord     _configRecord; 
        private ConfigurationSectionGroup   _configSectionGroup; 

        // 
        // Create the collection of all section groups in the section group.
        //
        internal ConfigurationSectionGroupCollection(MgmtConfigurationRecord configRecord, ConfigurationSectionGroup configSectionGroup) :
                base(StringComparer.Ordinal) { 
            _configRecord = configRecord;
            _configSectionGroup = configSectionGroup; 
 
            foreach (DictionaryEntry de in _configRecord.SectionGroupFactories) {
                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 ConfigurationSectionGroup this[string name] {
            get { 
                return Get(name); 
            }
        } 

        // Indexer via integer index.
        public ConfigurationSectionGroup this[int index] {
            get { 
                return Get(index);
            } 
        } 

        // 
        // Public methods
        //

        // 
        // Add a new section group 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, ConfigurationSectionGroup sectionGroup) { 
            VerifyIsAttachedToConfigRecord();
            _configRecord.AddConfigurationSectionGroup(_configSectionGroup.SectionGroupName, name, sectionGroup);
            BaseAdd(name, name);
        } 

        // 
        // Remove all section groups from the collection. 
        //
        public void Clear() { 
            VerifyIsAttachedToConfigRecord();

            //
            // If this is the root section group, do not require the location section to be written 
            // to the file.
            // 
            if (_configSectionGroup.IsRoot) { 
                _configRecord.RemoveLocationWriteRequirement();
            } 

            string[] allKeys = BaseGetAllKeys();
            foreach (string key in allKeys) {
                Remove(key); 
            }
        } 
 
        //
        // Return the number of section groups in the collection. 
        //
        public override int Count {
            get {
                return base.Count; 
            }
        } 
 
        //
        // Copy all section groups to an array. 
        //
        public void CopyTo(ConfigurationSectionGroup[] 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 group at a given index. 
        //
        public ConfigurationSectionGroup Get(int index) {
            return Get(GetKey(index));
        } 

        // 
        // Get the section group with a given name. 
        //
        public ConfigurationSectionGroup 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 group
            string configKey = BaseConfigurationRecord.CombineConfigKey(_configSectionGroup.SectionGroupName, name);
            return _configRecord.GetSectionGroup(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 (string) 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. This will also remove any descendant sections and
        // section groups.
        // 
        // Note that if the section group is declared in a parent, we still remove the declaration and
        // definition, and the instance of ConfigurationSectionGroup will be detached from the collection. 
        // However, the collection will still have a ConfigurationSectionGroup of that name in the collection, 
        // only it will have the value of the immediate parent.
        // 
        public void Remove(string name) {
            VerifyIsAttachedToConfigRecord();

            _configRecord.RemoveConfigurationSectionGroup(_configSectionGroup.SectionGroupName, name); 

            // 
            // Remove the section from the collection if it is no longer in the list of all SectionGroupFactories. 
            //
            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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ConfigurationSectionGroupCollection.cs source code in C# .NET

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