NameValueCollection.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Collections / Specialized / NameValueCollection.cs / 1 / NameValueCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Ordered String/String[] collection of name/value pairs with support for null key 
 * Wraps NameObject collection
 * 
 * Copyright (c) 2000 Microsoft Corporation
 */

namespace System.Collections.Specialized { 

    using Microsoft.Win32; 
    using System.Collections; 
    using System.Runtime.Serialization;
    using System.Text; 
    using System.Globalization;

    /// 
    /// Represents a sorted collection of associated  keys and  values that 
    ///    can be accessed either with the hash code of the key or with the index.
    ///  
    [Serializable()] 
    public class NameValueCollection : NameObjectCollectionBase {
 
        private String[] _all;
        private String[] _allKeys;

        // 
        // Constructors
        // 
 
        /// 
        /// Creates an empty  with the default initial capacity 
        ///    and using the default case-insensitive hash code provider and the default
        ///    case-insensitive comparer.
        /// 
        public NameValueCollection() : base() { 
        }
 
        ///  
        /// Copies the entries from the specified  to a new  with the same initial capacity as
        ///    the number of entries copied and using the default case-insensitive hash code 
        ///    provider and the default case-insensitive comparer.
        /// 
        public NameValueCollection(NameValueCollection col)
            : base( col != null? col.Comparer : null) { 
            Add(col);
        } 
 
        /// 
        /// Creates an empty  with the default initial capacity 
        ///    and using the specified case-insensitive hash code provider and the specified
        ///    case-insensitive comparer.
        /// 
#pragma warning disable 618 
        [Obsolete("Please use NameValueCollection(IEqualityComparer) instead.")]
        public NameValueCollection(IHashCodeProvider hashProvider, IComparer comparer) 
            : base(hashProvider, comparer) { 
        }
#pragma warning restore 618 

        /// 
        /// Creates an empty  with
        ///    the specified initial capacity and using the default case-insensitive hash code 
        ///    provider and the default case-insensitive comparer.
        ///  
        public NameValueCollection(int capacity) : base(capacity) { 
        }
 
        public NameValueCollection(IEqualityComparer equalityComparer) : base( equalityComparer) {
        }

        public NameValueCollection(Int32 capacity, IEqualityComparer equalityComparer) 
            : base(capacity, equalityComparer) {
        } 
 
        /// 
        /// Copies the entries from the specified  to a new  with the specified initial capacity or the 
        ///    same initial capacity as the number of entries copied, whichever is greater, and
        ///    using the default case-insensitive hash code provider and the default
        ///    case-insensitive comparer.
        ///  
        public NameValueCollection(int capacity, NameValueCollection col)
            : base(capacity, (col != null ? col.Comparer : null)) { 
            if( col == null) { 
                throw new ArgumentNullException("col");
            } 

            this.Comparer = col.Comparer;
            Add(col);
        } 

        ///  
        /// Creates an empty  with the specified initial capacity and 
        ///    using the specified case-insensitive hash code provider and the specified
        ///    case-insensitive comparer. 
        /// 
#pragma warning disable 618
        [Obsolete("Please use NameValueCollection(Int32, IEqualityComparer) instead.")]
        public NameValueCollection(int capacity, IHashCodeProvider hashProvider, IComparer comparer) 
            : base(capacity, hashProvider, comparer) {
        } 
#pragma warning restore 618 

        // Allow internal extenders to avoid creating the hashtable/arraylist. 
        internal NameValueCollection(DBNull dummy) : base(dummy)
        {
        }
 

        // 
        // Serialization support 
        //
 
        /// 
        ///    [To be supplied.]
        /// 
        protected NameValueCollection(SerializationInfo info, StreamingContext context) : base(info, context) { 
        }
 
        // 
        //  Helper methods
        // 

        /// 
        ///  Resets the cached arrays of the collection to .
        ///  
        protected void InvalidateCachedArrays() {
            _all = null; 
            _allKeys = null; 
        }
 
        private static String GetAsOneString(ArrayList list) {
            int n = (list != null) ? list.Count : 0;

            if (n == 1) { 
                return (String)list[0];
            } 
            else if (n > 1) { 
                StringBuilder s = new StringBuilder((String)list[0]);
 
                for (int i = 1; i < n; i++) {
                    s.Append(',');
                    s.Append((String)list[i]);
                } 

                return s.ToString(); 
            } 
            else {
                return null; 
            }
        }

        private static String[] GetAsStringArray(ArrayList list) 
        {
            int n = (list != null) ? list.Count : 0; 
            if (n == 0) 
                return null;
 
            String [] array = new String[n];
            list.CopyTo(0, array, 0, n);
            return array;
        } 

        // 
        // Misc public APIs 
        //
 
        /// 
        /// Copies the entries in the specified  to the current .
        /// 
        public void Add(NameValueCollection c) { 
            if( c == null) {
                throw new ArgumentNullException("c"); 
            } 

            InvalidateCachedArrays(); 

            int n = c.Count;

            for (int i = 0; i < n; i++) { 
                String key = c.GetKey(i);
                String[] values = c.GetValues(i); 
 
                if (values != null) {
                    for (int j = 0; j < values.Length; j++) 
                        Add(key, values[j]);
                }
                else {
                    Add(key, null); 
                }
            } 
        } 

        ///  
        ///    Invalidates the cached arrays and removes all entries
        ///       from the .
        /// 
        public virtual void Clear() { 
            if (IsReadOnly)
                throw new NotSupportedException(SR.GetString(SR.CollectionReadOnly)); 
 
            InvalidateCachedArrays();
            BaseClear(); 
        }

        public void CopyTo(Array dest, int index) {
            if (dest==null) { 
                throw new ArgumentNullException("dest");
            } 
 
            if (dest.Rank != 1) {
                throw new ArgumentException(SR.GetString(SR.Arg_MultiRank)); 
            }

            if (index < 0) {
                throw new ArgumentOutOfRangeException("index",SR.GetString(SR.IndexOutOfRange, index.ToString(CultureInfo.CurrentCulture)) ); 
            }
 
            if (dest.Length - index < Count) { 
                throw new ArgumentException(SR.GetString(SR.Arg_InsufficientSpace));
            } 

            int n = Count;
            if (_all == null) {
                _all = new String[n]; 
                for (int i = 0; i < n; i++) {
                    _all[i] = Get(i); 
                    dest.SetValue( _all[i], i + index); 
                }
            } 
            else {
                for (int i = 0; i < n; i++) {
                    dest.SetValue( _all[i], i + index);
                } 
            }
        } 
 
        /// 
        /// Gets a value indicating whether the  contains entries whose keys are not . 
        /// 
        public bool HasKeys() {
            return InternalHasKeys();
        } 

        ///  
        /// Allows derived classes to alter HasKeys(). 
        /// 
        internal virtual bool InternalHasKeys() 
        {
            return BaseHasKeys();
        }
 
        //
        // Access by name 
        // 

        ///  
        ///    Adds an entry with the specified name and value into the
        ///    .
        /// 
        public virtual void Add(String name, String value) { 
            if (IsReadOnly)
                throw new NotSupportedException(SR.GetString(SR.CollectionReadOnly)); 
 
            InvalidateCachedArrays();
 
            ArrayList values = (ArrayList)BaseGet(name);

            if (values == null) {
                // new key - add new key with single value 
                values = new ArrayList(1);
                if (value != null) 
                    values.Add(value); 
                BaseAdd(name, values);
            } 
            else {
                // old key -- append value to the list of values
                if (value != null)
                    values.Add(value); 
            }
        } 
 
        /// 
        ///  Gets the values associated with the specified key from the  combined into one comma-separated list. 
        /// 
        public virtual String Get(String name) {
            ArrayList values = (ArrayList)BaseGet(name);
            return GetAsOneString(values); 
        }
 
        ///  
        /// Gets the values associated with the specified key from the .
        ///  
        public virtual String[] GetValues(String name) {
            ArrayList values = (ArrayList)BaseGet(name);
            return GetAsStringArray(values);
        } 

        ///  
        /// Adds a value to an entry in the . 
        /// 
        public virtual void Set(String name, String value) { 
            if (IsReadOnly)
                throw new NotSupportedException(SR.GetString(SR.CollectionReadOnly));

            InvalidateCachedArrays(); 

            ArrayList values = new ArrayList(1); 
            values.Add(value); 
            BaseSet(name, values);
        } 

        /// 
        /// Removes the entries with the specified key from the  instance.
        ///  
        public virtual void Remove(String name) {
            InvalidateCachedArrays(); 
            BaseRemove(name); 
        }
 
        /// 
        ///     Represents the entry with the specified key in the
        ///    .
        ///  
        public String this[String name] {
            get { 
                return Get(name); 
            }
 
            set {
                Set(name, value);
            }
        } 

        // 
        // Indexed access 
        //
 
        /// 
        ///    
        ///       Gets the values at the specified index of the  combined into one
        ///       comma-separated list. 
        /// 
        public virtual String Get(int index)   { 
            ArrayList values = (ArrayList)BaseGet(index); 
            return GetAsOneString(values);
        } 

        /// 
        ///     Gets the values at the specified index of the .
        ///  
        public virtual String[] GetValues(int index) {
            ArrayList values = (ArrayList)BaseGet(index); 
            return GetAsStringArray(values); 
        }
 
        /// 
        /// Gets the key at the specified index of the .
        /// 
        public virtual String GetKey(int index) { 
            return BaseGetKey(index);
        } 
 
        /// 
        /// Represents the entry at the specified index of the . 
        /// 
        public String this[int index] {
            get {
                return Get(index); 
            }
        } 
 
        //
        // Access to keys and values as arrays 
        //

        /// 
        /// Gets all the keys in the .  
        /// 
        public virtual String[] AllKeys { 
            get { 
                if (_allKeys == null)
                    _allKeys = BaseGetAllKeys(); 
                return _allKeys;
            }
        }
    } 

}
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