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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
namespace System.Collections.Generic
{
// The SortedDictionary class implements a generic 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 dictionary
// can be ordered either according to a specific IComparer
// implementation given when the sorted dictionary is instantiated, or
// according to the IComparable implementation provided by the keys
// themselves. In either case, a sorted dictionary does not allow entries
// with duplicate or null 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 TrimExcess 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(IDictionaryDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
[System.Runtime.CompilerServices.TypeForwardedFrom("System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public class SortedList<TKey, TValue> :
IDictionary<TKey, TValue>, IDictionary, IReadOnlyDictionary<TKey, TValue> where TKey : notnull
{
private TKey[] keys; // Do not rename (binary serialization)
private TValue[] values; // Do not rename (binary serialization)
private int _size; // Do not rename (binary serialization)
private int version; // Do not rename (binary serialization)
private readonly IComparer<TKey> comparer; // Do not rename (binary serialization)
private KeyList? keyList; // Do not rename (binary serialization)
private ValueList? valueList; // Do not rename (binary serialization)
private const int DefaultCapacity = 4;
// 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 DefaultCapacity, 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()
{
keys = Array.Empty<TKey>();
values = Array.Empty<TValue>();
_size = 0;
comparer = Comparer<TKey>.Default;
}
// 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 capacity)
{
if (capacity < 0)
throw new ArgumentOutOfRangeException(nameof(capacity), capacity, SR.ArgumentOutOfRange_NeedNonNegNum);
keys = new TKey[capacity];
values = new TValue[capacity];
comparer = Comparer<TKey>.Default;
}
// 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<TKey>? comparer)
: this()
{
if (comparer != null)
{
this.comparer = comparer;
}
}
// Constructs a new sorted dictionary 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(int capacity, IComparer<TKey>? comparer)
: 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 given dictionary as well as keys
// subsequently added to the sorted list.
//
public SortedList(IDictionary<TKey, TValue> dictionary)
: this(dictionary, 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 given dictionary as well as keys
// subsequently added to the sorted list.
//
public SortedList(IDictionary<TKey, TValue> dictionary, IComparer<TKey>? comparer)
: this((dictionary != null ? dictionary.Count : 0), comparer)
{
if (dictionary == null)
throw new ArgumentNullException(nameof(dictionary));
int count = dictionary.Count;
if (count != 0)
{
TKey[] keys = this.keys;
dictionary.Keys.CopyTo(keys, 0);
dictionary.Values.CopyTo(values, 0);
Debug.Assert(count == this.keys.Length);
if (count > 1)
{
comparer = Comparer; // obtain default if this is null.
Array.Sort<TKey, TValue>(keys, values, comparer);
for (int i = 1; i != keys.Length; ++i)
{
if (comparer.Compare(keys[i - 1], keys[i]) == 0)
{
throw new ArgumentException(SR.Format(SR.Argument_AddingDuplicate, keys[i]));
}
}
}
}
_size = 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 void Add(TKey key, TValue value)
{
if (key == null) throw new ArgumentNullException(nameof(key));
int i = Array.BinarySearch<TKey>(keys, 0, _size, key, comparer);
if (i >= 0)
throw new ArgumentException(SR.Format(SR.Argument_AddingDuplicate, key), nameof(key));
Insert(~i, key, value);
}
void ICollection<KeyValuePair<TKey, TValue>>.Add(KeyValuePair<TKey, TValue> keyValuePair)
{
Add(keyValuePair.Key, keyValuePair.Value);
}
bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> keyValuePair)
{
int index = IndexOfKey(keyValuePair.Key);
if (index >= 0 && EqualityComparer<TValue>.Default.Equals(values[index], keyValuePair.Value))
{
return true;
}
return false;
}
bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> keyValuePair)
{
int index = IndexOfKey(keyValuePair.Key);
if (index >= 0 && EqualityComparer<TValue>.Default.Equals(values[index], keyValuePair.Value))
{
RemoveAt(index);
return true;
}
return false;
}
// 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 int Capacity
{
get
{
return keys.Length;
}
set
{
if (value != keys.Length)
{
if (value < _size)
{
throw new ArgumentOutOfRangeException(nameof(value), value, SR.ArgumentOutOfRange_SmallCapacity);
}
if (value > 0)
{
TKey[] newKeys = new TKey[value];
TValue[] newValues = new TValue[value];
if (_size > 0)
{
Array.Copy(keys, newKeys, _size);
Array.Copy(values, newValues, _size);
}
keys = newKeys;
values = newValues;
}
else
{
keys = Array.Empty<TKey>();
values = Array.Empty<TValue>();
}
}
}
}
public IComparer<TKey> Comparer
{
get
{
return comparer;
}
}
void IDictionary.Add(object key, object? value)
{
if (key == null)
throw new ArgumentNullException(nameof(key));
if (value == null && !(default(TValue)! == null)) // null is an invalid value for Value types // TODO-NULLABLE: default(T) == null warning (https://github.com/dotnet/roslyn/issues/34757)
throw new ArgumentNullException(nameof(value));
if (!(key is TKey))
throw new ArgumentException(SR.Format(SR.Arg_WrongType, key, typeof(TKey)), nameof(key));
if (!(value is TValue) && value != null) // null is a valid value for Reference Types
throw new ArgumentException(SR.Format(SR.Arg_WrongType, value, typeof(TValue)), nameof(value));
Add((TKey)key, (TValue)value!);
}
// Returns the number of entries in this sorted list.
public 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 IList<TKey> Keys
{
get
{
return GetKeyListHelper();
}
}
ICollection<TKey> IDictionary<TKey, TValue>.Keys
{
get
{
return GetKeyListHelper();
}
}
ICollection IDictionary.Keys
{
get
{
return GetKeyListHelper();
}
}
IEnumerable<TKey> IReadOnlyDictionary<TKey, TValue>.Keys
{
get
{
return GetKeyListHelper();
}
}
// 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 IList<TValue> Values
{
get
{
return GetValueListHelper();
}
}
ICollection<TValue> IDictionary<TKey, TValue>.Values
{
get
{
return GetValueListHelper();
}
}
ICollection IDictionary.Values
{
get
{
return GetValueListHelper();
}
}
IEnumerable<TValue> IReadOnlyDictionary<TKey, TValue>.Values
{
get
{
return GetValueListHelper();
}
}
private KeyList GetKeyListHelper()
{
if (keyList == null)
keyList = new KeyList(this);
return keyList;
}
private ValueList GetValueListHelper()
{
if (valueList == null)
valueList = new ValueList(this);
return valueList;
}
bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly
{
get { return false; }
}
bool IDictionary.IsReadOnly
{
get { return false; }
}
bool IDictionary.IsFixedSize
{
get { return false; }
}
bool ICollection.IsSynchronized
{
get { return false; }
}
// Synchronization root for this object.
object ICollection.SyncRoot => this;
// Removes all entries from this sorted list.
public void Clear()
{
// clear does not change the capacity
version++;
// Don't need to doc this but we clear the elements so that the gc can reclaim the references.
if (RuntimeHelpers.IsReferenceOrContainsReferences<TKey>())
{
Array.Clear(keys, 0, _size);
}
if (RuntimeHelpers.IsReferenceOrContainsReferences<TValue>())
{
Array.Clear(values, 0, _size);
}
_size = 0;
}
bool IDictionary.Contains(object key)
{
if (IsCompatibleKey(key))
{
return ContainsKey((TKey)key);
}
return false;
}
// Checks if this sorted list contains an entry with the given key.
public bool ContainsKey(TKey key)
{
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 bool ContainsValue(TValue value)
{
return IndexOfValue(value) >= 0;
}
// Copies the values in this SortedList to an array.
void ICollection<KeyValuePair<TKey, TValue>>.CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
{
if (array == null)
{
throw new ArgumentNullException(nameof(array));
}
if (arrayIndex < 0 || arrayIndex > array.Length)
{
throw new ArgumentOutOfRangeException(nameof(arrayIndex), arrayIndex, SR.ArgumentOutOfRange_Index);
}
if (array.Length - arrayIndex < Count)
{
throw new ArgumentException(SR.Arg_ArrayPlusOffTooSmall);
}
for (int i = 0; i < Count; i++)
{
KeyValuePair<TKey, TValue> entry = new KeyValuePair<TKey, TValue>(keys[i], values[i]);
array[arrayIndex + i] = entry;
}
}
void ICollection.CopyTo(Array array, int index)
{
if (array == null)
{
throw new ArgumentNullException(nameof(array));
}
if (array.Rank != 1)
{
throw new ArgumentException(SR.Arg_RankMultiDimNotSupported, nameof(array));
}
if (array.GetLowerBound(0) != 0)
{
throw new ArgumentException(SR.Arg_NonZeroLowerBound, nameof(array));
}
if (index < 0 || index > array.Length)
{
throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index);
}
if (array.Length - index < Count)
{
throw new ArgumentException(SR.Arg_ArrayPlusOffTooSmall);
}
KeyValuePair<TKey, TValue>[]? keyValuePairArray = array as KeyValuePair<TKey, TValue>[];
if (keyValuePairArray != null)
{
for (int i = 0; i < Count; i++)
{
keyValuePairArray[i + index] = new KeyValuePair<TKey, TValue>(keys[i], values[i]);
}
}
else
{
object[]? objects = array as object[];
if (objects == null)
{
throw new ArgumentException(SR.Argument_InvalidArrayType, nameof(array));
}
try
{
for (int i = 0; i < Count; i++)
{
objects[i + index] = new KeyValuePair<TKey, TValue>(keys[i], values[i]);
}
}
catch (ArrayTypeMismatchException)
{
throw new ArgumentException(SR.Argument_InvalidArrayType, nameof(array));
}
}
}
private const int MaxArrayLength = 0X7FEFFFFF;
// Ensures that the capacity of this sorted list is at least the given
// minimum value. If the current capacity of the list is less than
// min, the capacity is increased to twice the current capacity or
// to min, whichever is larger.
private void EnsureCapacity(int min)
{
int newCapacity = keys.Length == 0 ? DefaultCapacity : keys.Length * 2;
// Allow the list to grow to maximum possible capacity (~2G elements) before encountering overflow.
// Note that this check works even when _items.Length overflowed thanks to the (uint) cast
if ((uint)newCapacity > MaxArrayLength) newCapacity = MaxArrayLength;
if (newCapacity < min) newCapacity = min;
Capacity = newCapacity;
}
// Returns the value of the entry at the given index.
private TValue GetByIndex(int index)
{
if (index < 0 || index >= _size)
throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index);
return values[index];
}
public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
{
return new Enumerator(this, Enumerator.KeyValuePair);
}
IEnumerator<KeyValuePair<TKey, TValue>> IEnumerable<KeyValuePair<TKey, TValue>>.GetEnumerator()
{
return new Enumerator(this, Enumerator.KeyValuePair);
}
IDictionaryEnumerator IDictionary.GetEnumerator()
{
return new Enumerator(this, Enumerator.DictEntry);
}
IEnumerator IEnumerable.GetEnumerator()
{
return new Enumerator(this, Enumerator.KeyValuePair);
}
// Returns the key of the entry at the given index.
private TKey GetKey(int index)
{
if (index < 0 || index >= _size)
throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index);
return keys[index];
}
// Returns the value associated with the given key. If an entry with the
// given key is not found, the returned value is null.
public TValue this[TKey key]
{
get
{
int i = IndexOfKey(key);
if (i >= 0)
return values[i];
throw new KeyNotFoundException(SR.Format(SR.Arg_KeyNotFoundWithKey, key.ToString()));
}
set
{
if (((object)key) == null) throw new ArgumentNullException(nameof(key));
int i = Array.BinarySearch<TKey>(keys, 0, _size, key, comparer);
if (i >= 0)
{
values[i] = value;
version++;
return;
}
Insert(~i, key, value);
}
}
object? IDictionary.this[object key]
{
get
{
if (IsCompatibleKey(key))
{
int i = IndexOfKey((TKey)key);
if (i >= 0)
{
return values[i];
}
}
return null;
}
set
{
if (!IsCompatibleKey(key))
{
throw new ArgumentNullException(nameof(key));
}
if (value == null && !(default(TValue)! == null)) // TODO-NULLABLE: default(T) == null warning (https://github.com/dotnet/roslyn/issues/34757)
throw new ArgumentNullException(nameof(value));
TKey tempKey = (TKey)key;
try
{
this[tempKey] = (TValue)value!;
}
catch (InvalidCastException)
{
throw new ArgumentException(SR.Format(SR.Arg_WrongType, value, typeof(TValue)), nameof(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 int IndexOfKey(TKey key)
{
if (key == null)
throw new ArgumentNullException(nameof(key));
int ret = Array.BinarySearch<TKey>(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 int IndexOfValue(TValue 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, TKey key, TValue 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++;
}
public bool TryGetValue(TKey key, [MaybeNullWhen(false)] out TValue value)
{
int i = IndexOfKey(key);
if (i >= 0)
{
value = values[i];
return true;
}
value = default(TValue)!;
return false;
}
// Removes the entry at the given index. The size of the sorted list is
// decreased by one.
public void RemoveAt(int index)
{
if (index < 0 || index >= _size)
throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index);
_size--;
if (index < _size)
{
Array.Copy(keys, index + 1, keys, index, _size - index);
Array.Copy(values, index + 1, values, index, _size - index);
}
if (RuntimeHelpers.IsReferenceOrContainsReferences<TKey>())
{
keys[_size] = default(TKey)!;
}
if (RuntimeHelpers.IsReferenceOrContainsReferences<TValue>())
{
values[_size] = default(TValue)!;
}
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 bool Remove(TKey key)
{
int i = IndexOfKey(key);
if (i >= 0)
RemoveAt(i);
return i >= 0;
}
void IDictionary.Remove(object key)
{
if (IsCompatibleKey(key))
{
Remove((TKey)key);
}
}
// 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.TrimExcess();
public void TrimExcess()
{
int threshold = (int)(((double)keys.Length) * 0.9);
if (_size < threshold)
{
Capacity = _size;
}
}
private static bool IsCompatibleKey(object key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
return (key is TKey);
}
private struct Enumerator : IEnumerator<KeyValuePair<TKey, TValue>>, IDictionaryEnumerator
{
private readonly SortedList<TKey, TValue> _sortedList;
[AllowNull] private TKey _key;
[AllowNull] private TValue _value;
private int _index;
private readonly int _version;
private readonly int _getEnumeratorRetType; // What should Enumerator.Current return?
internal const int KeyValuePair = 1;
internal const int DictEntry = 2;
internal Enumerator(SortedList<TKey, TValue> sortedList, int getEnumeratorRetType)
{
_sortedList = sortedList;
_index = 0;
_version = _sortedList.version;
_getEnumeratorRetType = getEnumeratorRetType;
_key = default;
_value = default;
}
public void Dispose()
{
_index = 0;
_key = default;
_value = default;
}
object IDictionaryEnumerator.Key
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
return _key;
}
}
public bool MoveNext()
{
if (_version != _sortedList.version) throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
if ((uint)_index < (uint)_sortedList.Count)
{
_key = _sortedList.keys[_index];
_value = _sortedList.values[_index];
_index++;
return true;
}
_index = _sortedList.Count + 1;
_key = default;
_value = default;
return false;
}
DictionaryEntry IDictionaryEnumerator.Entry
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
return new DictionaryEntry(_key, _value);
}
}
public KeyValuePair<TKey, TValue> Current
{
get
{
return new KeyValuePair<TKey, TValue>(_key, _value);
}
}
object? IEnumerator.Current
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
if (_getEnumeratorRetType == DictEntry)
{
return new DictionaryEntry(_key, _value);
}
else
{
return new KeyValuePair<TKey, TValue>(_key, _value);
}
}
}
object? IDictionaryEnumerator.Value
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
return _value;
}
}
void IEnumerator.Reset()
{
if (_version != _sortedList.version)
{
throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
}
_index = 0;
_key = default;
_value = default;
}
}
private sealed class SortedListKeyEnumerator : IEnumerator<TKey>, IEnumerator
{
private readonly SortedList<TKey, TValue> _sortedList;
private int _index;
private readonly int _version;
[AllowNull] private TKey _currentKey = default!;
internal SortedListKeyEnumerator(SortedList<TKey, TValue> sortedList)
{
_sortedList = sortedList;
_version = sortedList.version;
}
public void Dispose()
{
_index = 0;
_currentKey = default;
}
public bool MoveNext()
{
if (_version != _sortedList.version)
{
throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
}
if ((uint)_index < (uint)_sortedList.Count)
{
_currentKey = _sortedList.keys[_index];
_index++;
return true;
}
_index = _sortedList.Count + 1;
_currentKey = default;
return false;
}
public TKey Current
{
get
{
return _currentKey;
}
}
object? IEnumerator.Current
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
return _currentKey;
}
}
void IEnumerator.Reset()
{
if (_version != _sortedList.version)
{
throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
}
_index = 0;
_currentKey = default;
}
}
private sealed class SortedListValueEnumerator : IEnumerator<TValue>, IEnumerator
{
private readonly SortedList<TKey, TValue> _sortedList;
private int _index;
private readonly int _version;
[AllowNull] private TValue _currentValue = default!;
internal SortedListValueEnumerator(SortedList<TKey, TValue> sortedList)
{
_sortedList = sortedList;
_version = sortedList.version;
}
public void Dispose()
{
_index = 0;
_currentValue = default;
}
public bool MoveNext()
{
if (_version != _sortedList.version)
{
throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
}
if ((uint)_index < (uint)_sortedList.Count)
{
_currentValue = _sortedList.values[_index];
_index++;
return true;
}
_index = _sortedList.Count + 1;
_currentValue = default;
return false;
}
public TValue Current
{
get
{
return _currentValue;
}
}
object? IEnumerator.Current
{
get
{
if (_index == 0 || (_index == _sortedList.Count + 1))
{
throw new InvalidOperationException(SR.InvalidOperation_EnumOpCantHappen);
}
return _currentValue;
}
}
void IEnumerator.Reset()
{
if (_version != _sortedList.version)
{
throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
}
_index = 0;
_currentValue = default;
}
}
[DebuggerTypeProxy(typeof(DictionaryKeyCollectionDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public sealed class KeyList : IList<TKey>, ICollection
{
private readonly SortedList<TKey, TValue> _dict; // Do not rename (binary serialization)
internal KeyList(SortedList<TKey, TValue> dictionary)
{
_dict = dictionary;
}
public int Count
{
get { return _dict._size; }
}
public bool IsReadOnly
{
get { return true; }
}
bool ICollection.IsSynchronized
{
get { return false; }
}
object ICollection.SyncRoot
{
get { return ((ICollection)_dict).SyncRoot; }
}
public void Add(TKey key)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public void Clear()
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public bool Contains(TKey key)
{
return _dict.ContainsKey(key);
}
public void CopyTo(TKey[] array, int arrayIndex)
{
// defer error checking to Array.Copy
Array.Copy(_dict.keys, 0, array, arrayIndex, _dict.Count);
}
void ICollection.CopyTo(Array array, int arrayIndex)
{
if (array != null && array.Rank != 1)
throw new ArgumentException(SR.Arg_RankMultiDimNotSupported, nameof(array));
try
{
// defer error checking to Array.Copy
Array.Copy(_dict.keys, 0, array!, arrayIndex, _dict.Count);
}
catch (ArrayTypeMismatchException)
{
throw new ArgumentException(SR.Argument_InvalidArrayType, nameof(array));
}
}
public void Insert(int index, TKey value)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public TKey this[int index]
{
get
{
return _dict.GetKey(index);
}
set
{
throw new NotSupportedException(SR.NotSupported_KeyCollectionSet);
}
}
public IEnumerator<TKey> GetEnumerator()
{
return new SortedListKeyEnumerator(_dict);
}
IEnumerator IEnumerable.GetEnumerator()
{
return new SortedListKeyEnumerator(_dict);
}
public int IndexOf(TKey key)
{
if (((object)key) == null)
throw new ArgumentNullException(nameof(key));
int i = Array.BinarySearch<TKey>(_dict.keys, 0,
_dict.Count, key, _dict.comparer);
if (i >= 0) return i;
return -1;
}
public bool Remove(TKey key)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
// return false;
}
public void RemoveAt(int index)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
}
[DebuggerTypeProxy(typeof(DictionaryValueCollectionDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public sealed class ValueList : IList<TValue>, ICollection
{
private readonly SortedList<TKey, TValue> _dict; // Do not rename (binary serialization)
internal ValueList(SortedList<TKey, TValue> dictionary)
{
_dict = dictionary;
}
public int Count
{
get { return _dict._size; }
}
public bool IsReadOnly
{
get { return true; }
}
bool ICollection.IsSynchronized
{
get { return false; }
}
object ICollection.SyncRoot
{
get { return ((ICollection)_dict).SyncRoot; }
}
public void Add(TValue key)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public void Clear()
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public bool Contains(TValue value)
{
return _dict.ContainsValue(value);
}
public void CopyTo(TValue[] array, int arrayIndex)
{
// defer error checking to Array.Copy
Array.Copy(_dict.values, 0, array, arrayIndex, _dict.Count);
}
void ICollection.CopyTo(Array array, int index)
{
if (array != null && array.Rank != 1)
throw new ArgumentException(SR.Arg_RankMultiDimNotSupported, nameof(array));
try
{
// defer error checking to Array.Copy
Array.Copy(_dict.values, 0, array!, index, _dict.Count);
}
catch (ArrayTypeMismatchException)
{
throw new ArgumentException(SR.Argument_InvalidArrayType, nameof(array));
}
}
public void Insert(int index, TValue value)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
public TValue this[int index]
{
get
{
return _dict.GetByIndex(index);
}
set
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
}
public IEnumerator<TValue> GetEnumerator()
{
return new SortedListValueEnumerator(_dict);
}
IEnumerator IEnumerable.GetEnumerator()
{
return new SortedListValueEnumerator(_dict);
}
public int IndexOf(TValue value)
{
return Array.IndexOf(_dict.values, value, 0, _dict.Count);
}
public bool Remove(TValue value)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
// return false;
}
public void RemoveAt(int index)
{
throw new NotSupportedException(SR.NotSupported_SortedListNestedWrite);
}
}
}
}