Created
March 3, 2017 17:34
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Observable Dictionary
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public class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, INotifyCollectionChanged, INotifyPropertyChanged | |
{ | |
private const string CountString = "Count"; | |
private const string IndexerName = "Item[]"; | |
private const string KeysName = "Keys"; | |
private const string ValuesName = "Values"; | |
private IDictionary<TKey, TValue> _Dictionary; | |
protected IDictionary<TKey, TValue> Dictionary | |
{ | |
get { return _Dictionary; } | |
} | |
#region Constructors | |
public ObservableDictionary() | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(); | |
} | |
public ObservableDictionary(IDictionary<TKey, TValue> dictionary) | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(dictionary); | |
} | |
public ObservableDictionary(IEqualityComparer<TKey> comparer) | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(comparer); | |
} | |
public ObservableDictionary(int capacity) | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(capacity); | |
} | |
public ObservableDictionary(IDictionary<TKey, TValue> dictionary, IEqualityComparer<TKey> comparer) | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(dictionary, comparer); | |
} | |
public ObservableDictionary(int capacity, IEqualityComparer<TKey> comparer) | |
{ | |
_Dictionary = new Dictionary<TKey, TValue>(capacity, comparer); | |
} | |
#endregion | |
#region IDictionary<TKey,TValue> Members | |
public void Add(TKey key, TValue value) | |
{ | |
Insert(key, value, true); | |
} | |
public bool ContainsKey(TKey key) | |
{ | |
return Dictionary.ContainsKey(key); | |
} | |
public ICollection<TKey> Keys | |
{ | |
get { return Dictionary.Keys; } | |
} | |
public bool Remove(TKey key) | |
{ | |
if (key == null) throw new ArgumentNullException("key"); | |
TValue value; | |
Dictionary.TryGetValue(key, out value); | |
var removed = Dictionary.Remove(key); | |
if (removed) | |
//OnCollectionChanged(NotifyCollectionChangedAction.Remove, new KeyValuePair<TKey, TValue>(key, value)); | |
OnCollectionChanged(); | |
return removed; | |
} | |
public bool TryGetValue(TKey key, out TValue value) | |
{ | |
return Dictionary.TryGetValue(key, out value); | |
} | |
public ICollection<TValue> Values | |
{ | |
get { return Dictionary.Values; } | |
} | |
public TValue this[TKey key] | |
{ | |
get | |
{ | |
return Dictionary[key]; | |
} | |
set | |
{ | |
Insert(key, value, false); | |
} | |
} | |
#endregion | |
#region ICollection<KeyValuePair<TKey,TValue>> Members | |
public void Add(KeyValuePair<TKey, TValue> item) | |
{ | |
Insert(item.Key, item.Value, true); | |
} | |
public void Clear() | |
{ | |
if (Dictionary.Count > 0) | |
{ | |
Dictionary.Clear(); | |
OnCollectionChanged(); | |
} | |
} | |
public bool Contains(KeyValuePair<TKey, TValue> item) | |
{ | |
return Dictionary.Contains(item); | |
} | |
public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) | |
{ | |
Dictionary.CopyTo(array, arrayIndex); | |
} | |
public int Count | |
{ | |
get { return Dictionary.Count; } | |
} | |
public bool IsReadOnly | |
{ | |
get { return Dictionary.IsReadOnly; } | |
} | |
public bool Remove(KeyValuePair<TKey, TValue> item) | |
{ | |
return Remove(item.Key); | |
} | |
#endregion | |
#region IEnumerable<KeyValuePair<TKey,TValue>> Members | |
public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() | |
{ | |
return Dictionary.GetEnumerator(); | |
} | |
#endregion | |
#region IEnumerable Members | |
IEnumerator IEnumerable.GetEnumerator() | |
{ | |
return ((IEnumerable)Dictionary).GetEnumerator(); | |
} | |
#endregion | |
#region INotifyCollectionChanged Members | |
public event NotifyCollectionChangedEventHandler CollectionChanged; | |
#endregion | |
#region INotifyPropertyChanged Members | |
public event PropertyChangedEventHandler PropertyChanged; | |
#endregion | |
public void AddRange(IDictionary<TKey, TValue> items) | |
{ | |
if (items == null) throw new ArgumentNullException("items"); | |
if (items.Count > 0) | |
{ | |
if (Dictionary.Count > 0) | |
{ | |
if (items.Keys.Any((k) => Dictionary.ContainsKey(k))) | |
throw new ArgumentException("An item with the same key has already been added."); | |
else | |
foreach (var item in items) Dictionary.Add(item); | |
} | |
else | |
_Dictionary = new Dictionary<TKey, TValue>(items); | |
OnCollectionChanged(NotifyCollectionChangedAction.Add, items.ToArray()); | |
} | |
} | |
private void Insert(TKey key, TValue value, bool add) | |
{ | |
if (key == null) throw new ArgumentNullException("key"); | |
TValue item; | |
if (Dictionary.TryGetValue(key, out item)) | |
{ | |
if (add) throw new ArgumentException("An item with the same key has already been added."); | |
if (Equals(item, value)) return; | |
Dictionary[key] = value; | |
OnCollectionChanged(NotifyCollectionChangedAction.Replace, new KeyValuePair<TKey, TValue>(key, value), new KeyValuePair<TKey, TValue>(key, item)); | |
} | |
else | |
{ | |
Dictionary[key] = value; | |
OnCollectionChanged(NotifyCollectionChangedAction.Add, new KeyValuePair<TKey, TValue>(key, value)); | |
} | |
} | |
private void OnPropertyChanged() | |
{ | |
OnPropertyChanged(CountString); | |
OnPropertyChanged(IndexerName); | |
OnPropertyChanged(KeysName); | |
OnPropertyChanged(ValuesName); | |
} | |
protected virtual void OnPropertyChanged(string propertyName) | |
{ | |
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); | |
} | |
private void OnCollectionChanged() | |
{ | |
OnPropertyChanged(); | |
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); | |
} | |
private void OnCollectionChanged(NotifyCollectionChangedAction action, KeyValuePair<TKey, TValue> changedItem) | |
{ | |
OnPropertyChanged(); | |
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, changedItem)); | |
} | |
private void OnCollectionChanged(NotifyCollectionChangedAction action, KeyValuePair<TKey, TValue> newItem, KeyValuePair<TKey, TValue> oldItem) | |
{ | |
OnPropertyChanged(); | |
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, newItem, oldItem)); | |
} | |
private void OnCollectionChanged(NotifyCollectionChangedAction action, IList newItems) | |
{ | |
OnPropertyChanged(); | |
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, newItems)); | |
} | |
} |
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