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}