SortedList.cs source code in C# .NET

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Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / SortedList.cs / 1305376 / SortedList.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SortedList 
**
** [....] 
**
** Purpose: A sorted dictionary.
**
** 
===========================================================*/
namespace System.Collections { 
    using System; 
    using System.Security.Permissions;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Diagnostics.Contracts;

    // The SortedList class implements a sorted list of keys and values. Entries in 
    // a sorted list are sorted by their keys and are accessible both by key and by
    // index. The keys of a sorted list can be ordered either according to a 
    // specific IComparer implementation given when the sorted list is 
    // instantiated, or according to the IComparable implementation provided
    // by the keys themselves. In either case, a sorted list does not allow entries 
    // with duplicate keys.
    //
    // A sorted list internally maintains two arrays that store the keys and
    // values of the entries. The capacity of a sorted list is the allocated 
    // length of these internal arrays. As elements are added to a sorted list, the
    // capacity of the sorted list is automatically increased as required by 
    // reallocating the internal arrays.  The capacity is never automatically 
    // decreased, but users can call either TrimToSize or
    // Capacity explicitly. 
    //
    // The GetKeyList and GetValueList methods of a sorted list
    // provides access to the keys and values of the sorted list in the form of
    // List implementations. The List objects returned by these 
    // methods are aliases for the underlying sorted list, so modifications
    // made to those lists are directly reflected in the sorted list, and vice 
    // versa. 
    //
    // The SortedList class provides a convenient way to create a sorted 
    // copy of another dictionary, such as a Hashtable. For example:
    //
    // Hashtable h = new Hashtable();
    // h.Add(...); 
    // h.Add(...);
    // ... 
    // SortedList s = new SortedList(h); 
    //
    // The last line above creates a sorted list that contains a copy of the keys 
    // and values stored in the hashtable. In this particular example, the keys
    // will be ordered according to the IComparable interface, which they
    // all must implement. To impose a different ordering, SortedList also
    // has a constructor that allows a specific IComparer implementation to 
    // be specified.
    // 
    [DebuggerTypeProxy(typeof(System.Collections.SortedList.SortedListDebugView))] 
    [DebuggerDisplay("Count = {Count}")]
[System.Runtime.InteropServices.ComVisible(true)] 
#if FEATURE_CORECLR
    [Obsolete("Non-generic collections have been deprecated. Please use collections in System.Collections.Generic.")]
#endif
    [Serializable] 
    public class SortedList : IDictionary, ICloneable
    { 
        private Object[] keys; 
        private Object[] values;
        private int _size; 
        private int version;
        private IComparer comparer;
        private KeyList keyList;
        private ValueList valueList; 
        [NonSerialized]
        private Object _syncRoot; 
 
        private const int _defaultCapacity = 16;
 
        private static Object[] emptyArray = new Object[0];

        // Constructs a new sorted list. The sorted list is initially empty and has
        // a capacity of zero. Upon adding the first element to the sorted list the 
        // capacity is increased to 16, and then increased in multiples of two as
        // required. The elements of the sorted list are ordered according to the 
        // IComparable interface, which must be implemented by the keys of 
        // all entries added to the sorted list.
        public SortedList() { 
            Init();
        }
        private void Init()
        { 
            keys = emptyArray;
            values = emptyArray; 
            _size = 0; 
            comparer = new Comparer(CultureInfo.CurrentCulture);
        } 

        // Constructs a new sorted list. The sorted list is initially empty and has
        // a capacity of zero. Upon adding the first element to the sorted list the
        // capacity is increased to 16, and then increased in multiples of two as 
        // required. The elements of the sorted list are ordered according to the
        // IComparable interface, which must be implemented by the keys of 
        // all entries added to the sorted list. 
        //
        public SortedList(int initialCapacity) { 
            if (initialCapacity < 0)
                throw new ArgumentOutOfRangeException("initialCapacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
            Contract.EndContractBlock();
            keys = new Object[initialCapacity]; 
            values = new Object[initialCapacity];
            comparer = new Comparer(CultureInfo.CurrentCulture); 
        } 

        // Constructs a new sorted list with a given IComparer 
        // implementation. The sorted list is initially empty and has a capacity of
        // zero. Upon adding the first element to the sorted list the capacity is
        // increased to 16, and then increased in multiples of two as required. The
        // elements of the sorted list are ordered according to the given 
        // IComparer implementation. If comparer is null, the
        // elements are compared to each other using the IComparable 
        // interface, which in that case must be implemented by the keys of all 
        // entries added to the sorted list.
        // 
        public SortedList(IComparer comparer)
            : this() {
            if (comparer != null) this.comparer = comparer;
        } 

        // Constructs a new sorted list with a given IComparer 
        // implementation and a given initial capacity. The sorted list is 
        // initially empty, but will have room for the given number of elements
        // before any reallocations are required. The elements of the sorted list 
        // are ordered according to the given IComparer implementation. If
        // comparer is null, the elements are compared to each other using
        // the IComparable interface, which in that case must be implemented
        // by the keys of all entries added to the sorted list. 
        //
        public SortedList(IComparer comparer, int capacity) 
            : this(comparer) { 
            Capacity = capacity;
        } 

        // Constructs a new sorted list containing a copy of the entries in the
        // given dictionary. The elements of the sorted list are ordered according
        // to the IComparable interface, which must be implemented by the 
        // keys of all entries in the the given dictionary as well as keys
        // subsequently added to the sorted list. 
        // 
        public SortedList(IDictionary d)
            : this(d, null) { 
        }

        // Constructs a new sorted list containing a copy of the entries in the
        // given dictionary. The elements of the sorted list are ordered according 
        // to the given IComparer implementation. If comparer is
        // null, the elements are compared to each other using the 
        // IComparable interface, which in that case must be implemented 
        // by the keys of all entries in the the given dictionary as well as keys
        // subsequently added to the sorted list. 
        //
        public SortedList(IDictionary d, IComparer comparer)
            : this(comparer, (d != null ? d.Count : 0)) {
            if (d==null) 
                throw new ArgumentNullException("d", Environment.GetResourceString("ArgumentNull_Dictionary"));
            Contract.EndContractBlock(); 
            d.Keys.CopyTo(keys, 0); 
            d.Values.CopyTo(values, 0);
            Array.Sort(keys, values, comparer); 
            _size = d.Count;
        }

        // Adds an entry with the given key and value to this sorted list. An 
        // ArgumentException is thrown if the key is already present in the sorted list.
        // 
        public virtual void Add(Object key, Object value) { 
            if (key == null) throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
            Contract.EndContractBlock(); 
            int i = Array.BinarySearch(keys, 0, _size, key, comparer);
            if (i >= 0)
                throw new ArgumentException(Environment.GetResourceString("Argument_AddingDuplicate__", GetKey(i), key));
            Insert(~i, key, value); 
        }
 
        // Returns the capacity of this sorted list. The capacity of a sorted list 
        // represents the allocated length of the internal arrays used to store the
        // keys and values of the list, and thus also indicates the maximum number 
        // of entries the list can contain before a reallocation of the internal
        // arrays is required.
        //
         public virtual int Capacity { 
            get {
                return keys.Length; 
            } 
            set {
                if (value < Count) { 
                    throw new ArgumentOutOfRangeException("value", Environment.GetResourceString("ArgumentOutOfRange_SmallCapacity"));
                }
                Contract.EndContractBlock();
 
                if (value != keys.Length) {
                    if (value > 0) { 
                        Object[] newKeys = new Object[value]; 
                        Object[] newValues = new Object[value];
                        if (_size > 0) { 
                            Array.Copy(keys, 0, newKeys, 0, _size);
                            Array.Copy(values, 0, newValues, 0, _size);
                        }
                        keys = newKeys; 
                        values = newValues;
                    } 
                    else { 
                        // size can only be zero here.
                        Contract.Assert( _size == 0, "Size is not zero"); 
                        keys = emptyArray;
                        values = emptyArray;
                    }
                } 
            }
        } 
 
        // Returns the number of entries in this sorted list.
        // 
        public virtual int Count {
            get {
                return _size;
            } 
        }
 
        // Returns a collection representing the keys of this sorted list. This 
        // method returns the same object as GetKeyList, but typed as an
        // ICollection instead of an IList. 
        //
         public virtual ICollection Keys {
            get {
               return GetKeyList(); 
            }
        } 
 
        // Returns a collection representing the values of this sorted list. This
        // method returns the same object as GetValueList, but typed as an 
        // ICollection instead of an IList.
        //
         public virtual ICollection Values {
            get { 
                return GetValueList();
            } 
        } 

        // Is this SortedList read-only? 
        public virtual bool IsReadOnly {
            get { return false; }
        }
 
        public virtual bool IsFixedSize {
            get { return false; } 
        } 

        // Is this SortedList synchronized (thread-safe)? 
        public virtual bool IsSynchronized {
            get { return false; }
        }
 
        // Synchronization root for this object.
        public virtual Object SyncRoot { 
            get { 
                if( _syncRoot == null) {
                    System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); 
                }
                return _syncRoot;
            }
        } 

        // Removes all entries from this sorted list. 
        public virtual void Clear() { 
            // clear does not change the capacity
            version++; 
            Array.Clear(keys, 0, _size); // Don't need to doc this but we clear the elements so that the gc can reclaim the references.
            Array.Clear(values, 0, _size); // Don't need to doc this but we clear the elements so that the gc can reclaim the references.
            _size = 0;
 
        }
 
        // Makes a virtually identical copy of this SortedList.  This is a shallow 
        // copy.  IE, the Objects in the SortedList are not cloned - we copy the
        // references to those objects. 
        public virtual Object Clone()
        {
            SortedList sl = new SortedList(_size);
            Array.Copy(keys, 0, sl.keys, 0, _size); 
            Array.Copy(values, 0, sl.values, 0, _size);
            sl._size = _size; 
            sl.version = version; 
            sl.comparer = comparer;
            // Don't copy keyList nor valueList. 
            return sl;
        }

 
        // Checks if this sorted list contains an entry with the given key.
        // 
        public virtual bool Contains(Object key) { 
            return IndexOfKey(key) >= 0;
        } 

        // Checks if this sorted list contains an entry with the given key.
        //
        public virtual bool ContainsKey(Object key) { 
            // Yes, this is a SPEC'ed duplicate of Contains().
            return IndexOfKey(key) >= 0; 
        } 

        // Checks if this sorted list contains an entry with the given value. The 
        // values of the entries of the sorted list are compared to the given value
        // using the Object.Equals method. This method performs a linear
        // search and is substantially slower than the Contains
        // method. 
        //
        public virtual bool ContainsValue(Object value) { 
            return IndexOfValue(value) >= 0; 
        }
 
        // Copies the values in this SortedList to an array.
        public virtual void CopyTo(Array array, int arrayIndex) {
            if (array == null)
                throw new ArgumentNullException("array", Environment.GetResourceString("ArgumentNull_Array")); 
            if (array.Rank != 1)
                throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); 
            if (arrayIndex < 0) 
                throw new ArgumentOutOfRangeException("arrayIndex", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
            if (array.Length - arrayIndex < Count) 
                throw new ArgumentException(Environment.GetResourceString("Arg_ArrayPlusOffTooSmall"));
            Contract.EndContractBlock();
            for (int i = 0; i= Count) 
                throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
            Contract.EndContractBlock(); 
            return values[index];
        }

        // Returns an IEnumerator for this sorted list.  If modifications 
        // made to the sorted list while an enumeration is in progress,
        // the MoveNext and Remove methods 
        // of the enumerator will throw an exception. 
        //
        IEnumerator IEnumerable.GetEnumerator() { 
            return new SortedListEnumerator(this, 0, _size, SortedListEnumerator.DictEntry);
        }

        // Returns an IDictionaryEnumerator for this sorted list.  If modifications 
        // made to the sorted list while an enumeration is in progress,
        // the MoveNext and Remove methods 
        // of the enumerator will throw an exception. 
        //
        public virtual IDictionaryEnumerator GetEnumerator() { 
            return new SortedListEnumerator(this, 0, _size, SortedListEnumerator.DictEntry);
        }

        // Returns the key of the entry at the given index. 
        //
        public virtual Object GetKey(int index) { 
            if (index < 0 || index >= Count) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); 
            Contract.EndContractBlock();
            return keys[index]; 
        }

        // Returns an IList representing the keys of this sorted list. The
        // returned list is an alias for the keys of this sorted list, so 
        // modifications made to the returned list are directly reflected in the
        // underlying sorted list, and vice versa. The elements of the returned 
        // list are ordered in the same way as the elements of the sorted list. The 
        // returned list does not support adding, inserting, or modifying elements
        // (the Add, AddRange, Insert, InsertRange, 
        // Reverse, Set, SetRange, and Sort methods
        // throw exceptions), but it does allow removal of elements (through the
        // Remove and RemoveRange methods or through an enumerator).
        // Null is an invalid key value. 
        //
        public virtual IList GetKeyList() { 
            if (keyList == null) keyList = new KeyList(this); 
            return keyList;
        } 

        // Returns an IList representing the values of this sorted list. The
        // returned list is an alias for the values of this sorted list, so
        // modifications made to the returned list are directly reflected in the 
        // underlying sorted list, and vice versa. The elements of the returned
        // list are ordered in the same way as the elements of the sorted list. The 
        // returned list does not support adding or inserting elements (the 
        // Add, AddRange, Insert and InsertRange
        // methods throw exceptions), but it does allow modification and removal of 
        // elements (through the Remove, RemoveRange, Set and
        // SetRange methods or through an enumerator).
        //
        public virtual IList GetValueList() { 
            if (valueList == null) valueList = new ValueList(this);
            return valueList; 
        } 

        // Returns the value associated with the given key. If an entry with the 
        // given key is not found, the returned value is null.
        //
        public virtual Object this[Object key] {
            get { 
                int i = IndexOfKey(key);
                if (i >= 0) return values[i]; 
                return null; 
            }
            set { 
                if (key == null) throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
                Contract.EndContractBlock();
                int i = Array.BinarySearch(keys, 0, _size, key, comparer);
                if (i >= 0) { 
                    values[i] = value;
                    version++; 
                    return; 
                }
                Insert(~i, key, value); 
            }
        }

        // Returns the index of the entry with a given key in this sorted list. The 
        // key is located through a binary search, and thus the average execution
        // time of this method is proportional to Log2(size), where 
        // size is the size of this sorted list. The returned value is -1 if 
        // the given key does not occur in this sorted list. Null is an invalid
        // key value. 
        //
        public virtual int IndexOfKey(Object key) {
            if (key == null)
                throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key")); 
            Contract.EndContractBlock();
            int ret = Array.BinarySearch(keys, 0, _size, key, comparer); 
            return ret >=0 ? ret : -1; 
        }
 
        // Returns the index of the first occurrence of an entry with a given value
        // in this sorted list. The entry is located through a linear search, and
        // thus the average execution time of this method is proportional to the
        // size of this sorted list. The elements of the list are compared to the 
        // given value using the Object.Equals method.
        // 
        public virtual int IndexOfValue(Object value) { 
            return Array.IndexOf(values, value, 0, _size);
        } 

        // Inserts an entry with a given key and value at a given index.
        private void Insert(int index, Object key, Object value) {
            if (_size == keys.Length) EnsureCapacity(_size + 1); 
            if (index < _size) {
                Array.Copy(keys, index, keys, index + 1, _size - index); 
                Array.Copy(values, index, values, index + 1, _size - index); 
            }
            keys[index] = key; 
            values[index] = value;
            _size++;
            version++;
        } 

        // Removes the entry at the given index. The size of the sorted list is 
        // decreased by one. 
        //
        public virtual void RemoveAt(int index) { 
            if (index < 0 || index >= Count) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
            Contract.EndContractBlock();
            _size--;
            if (index < _size) { 
                Array.Copy(keys, index + 1, keys, index, _size - index);
                Array.Copy(values, index + 1, values, index, _size - index); 
            } 
            keys[_size] = null;
            values[_size] = null; 
            version++;
        }

        // Removes an entry from this sorted list. If an entry with the specified 
        // key exists in the sorted list, it is removed. An ArgumentException is
        // thrown if the key is null. 
        // 
        public virtual void Remove(Object key) {
            int i = IndexOfKey(key); 
            if (i >= 0)
            RemoveAt(i);
        }
 
        // Sets the value at an index to a given value.  The previous value of
        // the given entry is overwritten. 
        // 
        public virtual void SetByIndex(int index, Object value) {
            if (index < 0 || index >= Count) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); 
            Contract.EndContractBlock();
            values[index] = value;
            version++;
        } 

        // Returns a thread-safe SortedList. 
        // 
        [HostProtection(Synchronization=true)]
        public static SortedList Synchronized(SortedList list) { 
            if (list==null)
                throw new ArgumentNullException("list");
            Contract.EndContractBlock();
            return new SyncSortedList(list); 
        }
 
        // Sets the capacity of this sorted list to the size of the sorted list. 
        // This method can be used to minimize a sorted list's memory overhead once
        // it is known that no new elements will be added to the sorted list. To 
        // completely clear a sorted list and release all memory referenced by the
        // sorted list, execute the following statements:
        //
        // sortedList.Clear(); 
        // sortedList.TrimToSize();
        // 
        public virtual void TrimToSize() { 
            Capacity = _size;
        } 

        [Serializable]
        private class SyncSortedList : SortedList
        { 
            private SortedList _list;
            private Object _root; 
 

            internal SyncSortedList(SortedList list) { 
                _list = list;
                _root = list.SyncRoot;
            }
 
            public override int Count {
                get { lock(_root) { return _list.Count; } } 
            } 

            public override Object SyncRoot { 
                get { return _root; }
            }

            public override bool IsReadOnly { 
                get { return _list.IsReadOnly; }
            } 
 
            public override bool IsFixedSize {
                get { return _list.IsFixedSize; } 
            }


            public override bool IsSynchronized { 
                get { return true; }
            } 
 
            public override Object this[Object key] {
                get { 
                    lock(_root) {
                        return _list[key];
                    }
                } 
                set {
                    lock(_root) { 
                        _list[key] = value; 
                    }
                } 
            }

            public override void Add(Object key, Object value) {
                lock(_root) { 
                    _list.Add(key, value);
                } 
            } 

            public override int Capacity { 
                get{ lock(_root) {  return _list.Capacity; } }
            }

            public override void Clear() { 
                lock(_root) {
                    _list.Clear(); 
                } 
            }
 
            public override Object Clone() {
                lock(_root) {
                    return _list.Clone();
                } 
            }
 
            public override bool Contains(Object key) { 
                lock(_root) {
                    return _list.Contains(key); 
                }
            }

            public override bool ContainsKey(Object key) { 
                lock(_root) {
                    return _list.ContainsKey(key); 
                } 
            }
 
            public override bool ContainsValue(Object key) {
                lock(_root) {
                    return _list.ContainsValue(key);
                } 
            }
 
            public override void CopyTo(Array array, int index) { 
                lock(_root) {
                    _list.CopyTo(array, index); 
                }
            }

            public override Object GetByIndex(int index) { 
                lock(_root) {
                    return _list.GetByIndex(index); 
                } 
            }
 
            public override IDictionaryEnumerator GetEnumerator() {
                lock(_root) {
                    return _list.GetEnumerator();
                } 
            }
 
            public override Object GetKey(int index) { 
                lock(_root) {
                    return _list.GetKey(index); 
                }
            }

            public override IList GetKeyList() { 
                lock(_root) {
                    return _list.GetKeyList(); 
                } 
            }
 
            public override IList GetValueList() {
                lock(_root) {
                    return _list.GetValueList();
                } 
            }
 
            public override int IndexOfKey(Object key) { 
                lock(_root) {
                    return _list.IndexOfKey(key); 
                }
            }

            public override int IndexOfValue(Object value) { 
                lock(_root) {
                    return _list.IndexOfValue(value); 
                } 
            }
 
            public override void RemoveAt(int index) {
                lock(_root) {
                    _list.RemoveAt(index);
                } 
            }
 
            public override void Remove(Object key) { 
                lock(_root) {
                    _list.Remove(key); 
                }
            }

            public override void SetByIndex(int index, Object value) { 
                lock(_root) {
                    _list.SetByIndex(index, value); 
                } 
            }
 
            internal override KeyValuePairs[] ToKeyValuePairsArray() {
                return _list.ToKeyValuePairsArray();
            }
 
            public override void TrimToSize() {
                lock(_root) { 
                    _list.TrimToSize(); 
                }
            } 
        }


        [Serializable] 
        private class SortedListEnumerator : IDictionaryEnumerator, ICloneable
        { 
            private SortedList sortedList; 
            private Object key;
            private Object value; 
            private int index;
            private int startIndex;        // Store for Reset.
            private int endIndex;
            private int version; 
            private bool current;       // Is the current element valid?
            private int getObjectRetType;  // What should GetObject return? 
 
            internal const int Keys = 1;
            internal const int Values = 2; 
            internal const int DictEntry = 3;

            internal SortedListEnumerator(SortedList sortedList, int index, int count,
                                 int getObjRetType) { 
                this.sortedList = sortedList;
                this.index = index; 
                startIndex = index; 
                endIndex = index + count;
                version = sortedList.version; 
                getObjectRetType = getObjRetType;
                current = false;
            }
 
            public Object Clone()
            { 
                return MemberwiseClone(); 
            }
 
            public virtual Object Key {
                get {
                    if (version != sortedList.version) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                    if (current == false) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen")); 
                    return key;
                } 
            } 

            public virtual bool MoveNext() { 
                if (version != sortedList.version) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                if (index < endIndex) {
                    key = sortedList.keys[index];
                    value = sortedList.values[index]; 
                    index++;
                    current = true; 
                    return true; 
                }
                key = null; 
                value = null;
                current = false;
                return false;
            } 

            public virtual DictionaryEntry Entry { 
                get { 
                    if (version != sortedList.version) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                    if (current == false) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen")); 
                    return new DictionaryEntry(key, value);
                }
            }
 
            public virtual Object Current {
                get { 
                    if (current == false) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen")); 

                    if (getObjectRetType==Keys) 
                        return key;
                    else if (getObjectRetType==Values)
                        return value;
                    else 
                        return new DictionaryEntry(key, value);
                } 
            } 

            public virtual Object Value { 
                get {
                    if (version != sortedList.version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion));
                    if (current == false) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                    return value; 
                }
            } 
 
            public virtual void Reset() {
                if (version != sortedList.version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion)); 
                index = startIndex;
                current = false;
                key = null;
                value = null; 
            }
        } 
 
        [Serializable]
        private class KeyList : IList 
        {
            private SortedList sortedList;

            internal KeyList(SortedList sortedList) { 
                this.sortedList = sortedList;
            } 
 
            public virtual int Count {
                get { return sortedList._size; } 
            }

            public virtual bool IsReadOnly {
                get { return true; } 
            }
 
            public virtual bool IsFixedSize { 
                get { return true; }
            } 

            public virtual bool IsSynchronized {
                get { return sortedList.IsSynchronized; }
            } 

            public virtual Object SyncRoot { 
                get { return sortedList.SyncRoot; } 
            }
 
            public virtual int Add(Object key) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite));
                //            return 0; // suppress compiler warning
            } 

            public virtual void Clear() { 
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            }
 
            public virtual bool Contains(Object key) {
                return sortedList.Contains(key);
            }
 
            public virtual void CopyTo(Array array, int arrayIndex) {
                if (array != null && array.Rank != 1) 
                    throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); 
                Contract.EndContractBlock();
 
                // defer error checking to Array.Copy
                Array.Copy(sortedList.keys, 0, array, arrayIndex, sortedList.Count);
            }
 
            public virtual void Insert(int index, Object value) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            } 

            public virtual Object this[int index] { 
                get {
                    return sortedList.GetKey(index);
                }
                set { 
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_KeyCollectionSet"));
                } 
            } 

            public virtual IEnumerator GetEnumerator() { 
                return new SortedListEnumerator(sortedList, 0, sortedList.Count, SortedListEnumerator.Keys);
            }

            public virtual int IndexOf(Object key) { 
                if (key==null)
                    throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key")); 
                Contract.EndContractBlock(); 

                int i = Array.BinarySearch(sortedList.keys, 0, 
                                           sortedList.Count, key, sortedList.comparer);
                if (i >= 0) return i;
                return -1;
            } 

            public virtual void Remove(Object key) { 
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            }
 
            public virtual void RemoveAt(int index) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite));
            }
        } 

        [Serializable] 
        private class ValueList : IList 
        {
            private SortedList sortedList; 

            internal ValueList(SortedList sortedList) {
                this.sortedList = sortedList;
            } 

            public virtual int Count { 
                get { return sortedList._size; } 
            }
 
            public virtual bool IsReadOnly {
                get { return true; }
            }
 
            public virtual bool IsFixedSize {
                get { return true; } 
            } 

            public virtual bool IsSynchronized { 
                get { return sortedList.IsSynchronized; }
            }

            public virtual Object SyncRoot { 
                get { return sortedList.SyncRoot; }
            } 
 
            public virtual int Add(Object key) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            }

            public virtual void Clear() {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            }
 
            public virtual bool Contains(Object value) { 
                return sortedList.ContainsValue(value);
            } 

            public virtual void CopyTo(Array array, int arrayIndex) {
                if (array != null && array.Rank != 1)
                    throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); 
                Contract.EndContractBlock();
 
                // defer error checking to Array.Copy 
                Array.Copy(sortedList.values, 0, array, arrayIndex, sortedList.Count);
            } 

            public virtual void Insert(int index, Object value) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite));
            } 

            public virtual Object this[int index] { 
                get { 
                    return sortedList.GetByIndex(index);
                } 
                set {
                    throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite));
                }
            } 

            public virtual IEnumerator GetEnumerator() { 
                return new SortedListEnumerator(sortedList, 0, sortedList.Count, SortedListEnumerator.Values); 
            }
 
            public virtual int IndexOf(Object value) {
                return Array.IndexOf(sortedList.values, value, 0, sortedList.Count);
            }
 
            public virtual void Remove(Object value) {
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite)); 
            } 

            public virtual void RemoveAt(int index) { 
                throw new NotSupportedException(Environment.GetResourceString(ResId.NotSupported_SortedListNestedWrite));
            }

        } 

        // internal debug view class for sorted list 
        internal class SortedListDebugView { 
            private SortedList sortedList;
 
            public SortedListDebugView( SortedList sortedList) {
                if( sortedList == null) {
                    throw new ArgumentNullException("sortedList");
                } 
                Contract.EndContractBlock();
 
                this.sortedList = sortedList; 
            }
 
            [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
            public KeyValuePairs[] Items {
                get {
                    return sortedList.ToKeyValuePairsArray(); 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.


                        

                        

                        
                        
                    
                    

                        
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