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
}
ConcurrentDictionary<TKey, TValue> 类
详细可以查看:http://msdn.microsoft.com/zh-cn/library/dd287191(v=vs.110).aspx
线程安全集合类 | 非线程安全集合类 |
ConcurrentQueue<T> |
Queue<T> |
ConcurrentStack<T> |
Stack<T> |
ConcurrentBag<T> |
List<T> |
ConcurrentDictionary<TKey,TValue> |
Dictionary<TKey,TValue> |
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