自定义Dictionary支持线程安全
本文转载:http://www.cnblogs.com/kiddo/archive/2008/09/25/1299089.html
public class SafeDictionary<TKey, TValue> : IDictionary<TKey, TValue> { private readonly object syncRoot = new object(); private readonly Dictionary<TKey, TValue> d = new Dictionary<TKey, TValue>(); #region IDictionary<TKey,TValue> Members /// <summary> /// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2"></see>. /// </summary> /// <param name="key">The object to use as the key of the element to add.</param> /// <param name="value">The object to use as the value of the element to add.</param> /// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IDictionary`2"></see> is read-only.</exception> /// <exception cref="T:System.ArgumentException">An element with the same key already exists in the <see cref="T:System.Collections.Generic.IDictionary`2"></see>.</exception> /// <exception cref="T:System.ArgumentNullException">key is null.</exception> public void Add(TKey key, TValue value) { lock (syncRoot) { d.Add(key, value); } } /// <summary> /// Determines whether the <see cref="T:System.Collections.Generic.IDictionary`2"></see> contains an element with the specified key. /// </summary> /// <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2"></see>.</param> /// <returns> /// true if the <see cref="T:System.Collections.Generic.IDictionary`2"></see> contains an element with the key; otherwise, false. /// </returns> /// <exception cref="T:System.ArgumentNullException">key is null.</exception> public bool ContainsKey(TKey key) { return d.ContainsKey(key); } /// <summary> /// Gets an <see cref="T:System.Collections.Generic.ICollection`1"></see> containing the keys of the <see cref="T:System.Collections.Generic.IDictionary`2"></see>. /// </summary> /// <value></value> /// <returns>An <see cref="T:System.Collections.Generic.ICollection`1"></see> containing the keys of the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"></see>.</returns> public ICollection<TKey> Keys { get { lock (syncRoot) { return d.Keys; } } } /// <summary> /// Removes the element with the specified key from the <see cref="T:System.Collections.Generic.IDictionary`2"></see>. /// </summary> /// <param name="key">The key of the element to remove.</param> /// <returns> /// true if the element is successfully removed; otherwise, false. This method also returns false if key was not found in the original <see cref="T:System.Collections.Generic.IDictionary`2"></see>. /// </returns> /// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IDictionary`2"></see> is read-only.</exception> /// <exception cref="T:System.ArgumentNullException">key is null.</exception> public bool Remove(TKey key) { lock (syncRoot) { return d.Remove(key); } } /// <summary> /// Tries the get value. /// </summary> /// <param name="key">The key.</param> /// <param name="value">The value.</param> /// <returns></returns> public bool TryGetValue(TKey key, out TValue value) { lock (syncRoot) { return d.TryGetValue(key, out value); } } /// <summary> /// Gets an <see cref="T:System.Collections.Generic.ICollection`1"></see> containing the values in the <see cref="T:System.Collections.Generic.IDictionary`2"></see>. /// </summary> /// <value></value> /// <returns>An <see cref="T:System.Collections.Generic.ICollection`1"></see> containing the values in the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"></see>.</returns> public ICollection<TValue> Values { get { lock (syncRoot) { return d.Values; } } } /// <summary> /// Gets or sets the <see cref="TValue"/> with the specified key. /// </summary> /// <value></value> public TValue this[TKey key] { get { return d[key]; } set { lock (syncRoot) { d[key] = value; } } } /// <summary> /// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1"></see>. /// </summary> /// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1"></see>.</param> /// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"></see> is read-only.</exception> public void Add(KeyValuePair<TKey, TValue> item) { lock (syncRoot) { ((ICollection<KeyValuePair<TKey, TValue>>)d).Add(item); } } /// <summary> /// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"></see>. /// </summary> /// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"></see> is read-only. </exception> public void Clear() { lock (syncRoot) { d.Clear(); } } /// <summary> /// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1"></see> contains a specific value. /// </summary> /// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1"></see>.</param> /// <returns> /// true if item is found in the <see cref="T:System.Collections.Generic.ICollection`1"></see>; otherwise, false. /// </returns> public bool Contains(KeyValuePair<TKey, TValue> item) { return ((ICollection<KeyValuePair<TKey, TValue>>)d).Contains(item); } /// <summary> /// Copies the elements of the <see cref="T:System.Collections.Generic.ICollection`1"></see> to an <see cref="T:System.Array"></see>, starting at a particular <see cref="T:System.Array"></see> index. /// </summary> /// <param name="array">The one-dimensional <see cref="T:System.Array"></see> that is the destination of the elements copied from <see cref="T:System.Collections.Generic.ICollection`1"></see>. The <see cref="T:System.Array"></see> must have zero-based indexing.</param> /// <param name="arrayIndex">The zero-based index in array at which copying begins.</param> /// <exception cref="T:System.ArgumentOutOfRangeException">arrayIndex is less than 0.</exception> /// <exception cref="T:System.ArgumentNullException">array is null.</exception> /// <exception cref="T:System.ArgumentException">array is multidimensional.-or-arrayIndex is equal to or greater than the length of array.-or-The number of elements in the source <see cref="T:System.Collections.Generic.ICollection`1"></see> is greater than the available space from arrayIndex to the end of the destination array.-or-Type T cannot be cast automatically to the type of the destination array.</exception> public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) { lock (syncRoot) { ((ICollection<KeyValuePair<TKey, TValue>>)d).CopyTo(array, arrayIndex); } } /// <summary> /// Gets the number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"></see>. /// </summary> /// <value></value> /// <returns>The number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"></see>.</returns> public int Count { get { return d.Count; } } /// <summary> /// Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1"></see> is read-only. /// </summary> /// <value></value> /// <returns>true if the <see cref="T:System.Collections.Generic.ICollection`1"></see> is read-only; otherwise, false.</returns> public bool IsReadOnly { get { return false; } } /// <summary> /// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1"></see>. /// </summary> /// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1"></see>.</param> /// <returns> /// true if item was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1"></see>; otherwise, false. This method also returns false if item is not found in the original <see cref="T:System.Collections.Generic.ICollection`1"></see>. /// </returns> /// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"></see> is read-only.</exception> public bool Remove(KeyValuePair<TKey, TValue> item) { lock (syncRoot) { return ((ICollection<KeyValuePair<TKey, TValue>>)d).Remove(item); } } /// <summary> /// Returns an enumerator that iterates through the collection. /// </summary> /// <returns> /// A <see cref="T:System.Collections.Generic.IEnumerator`1"></see> that can be used to iterate through the collection. /// </returns> public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() { return ((ICollection<KeyValuePair<TKey, TValue>>)d).GetEnumerator(); } /// <summary> /// Returns an enumerator that iterates through a collection. /// </summary> /// <returns> /// An <see cref="T:System.Collections.IEnumerator"></see> object that can be used to iterate through the collection. /// </returns> IEnumerator IEnumerable.GetEnumerator() { return ((IEnumerable)d).GetEnumerator(); } #endregion }