[Code Snippet] SyncStringDictionary - A synchronized StringDictionary

Here’s a code snippet for a thread-safe (synchronized) StringDictionary class:

class SyncStringDictionary : StringDictionary
{
/// <summary>
/// Initializes a new instance of the SyncStringDictionary class.
/// </summary>
public SyncStringDictionary()
{
}

/// <summary>
/// Gets the number of key/value pairs in the SyncStringDictionary.
/// </summary>
/// <returns>The number of key/value pairs in the SyncStringDictionary.Retrieving the value of this property is an O(1) operation.</returns>
public override int Count
{
get { lock (this.SyncRoot) { return base.Count; } }
}
/// <summary>
/// Gets a value that indicates whether access to the SyncStringDictionary is synchronized (thread safe).
/// </summary>
/// <returns>true if access to the SyncStringDictionary is synchronized (thread safe); otherwise, false.</returns>
public override bool IsSynchronized { get { return true; } }
/// <summary>
/// Gets a collection of keys in the SyncStringDictionary.
/// </summary>
/// <returns>An System.Collections.ICollection that provides the keys in the SyncStringDictionary.</returns>
///
public override System.Collections.ICollection Keys
{
get
{
lock (this.SyncRoot)
{
return base.Keys;
}
}
}
/// <summary>
/// Gets a collection of values in the SyncStringDictionary.
/// </summary>
/// <returns>An System.Collections.ICollection that provides the values in the SyncStringDictionary.</returns>
public override System.Collections.ICollection Values { get { lock (this.SyncRoot) { return base.Values; } } }

/// <summary>
/// Gets or sets the value associated with the specified key.
/// </summary>
/// <param name=”key”>The key whose value to get or set.</param>
/// <returns>The value associated with the specified key. If the specified key is not found, Get returns null, and Set creates a new entry with the specified key.</returns>
/// <exception cref=”System.ArgumentNullException”><paramref name=”key”/> is null.</exception>
public override string this[string key]
{
get { lock (this.SyncRoot) { return base[key]; } }
set { lock (this.SyncRoot) { base[key] = value; } }
}

/// <summary>
/// The value of the entry to add. The value can be null.
/// </summary>
/// <param name=”key”>The key of the entry to add.</param>
/// <param name=”value”>The value of the entry to add. The value can be null.</param>
/// <exception cref=”System.NotSupportedException”>The SyncStringDictionary is read-only.</exception>
/// <exception cref=”System.ArgumentException”>An entry with the same key already exists in the SyncStringDictionary.</exception>
/// <exception cref=”System.ArgumentNullException”><paramref name=”key”/> is null</exception>
public override void Add(string key, string value)
{
lock (this.SyncRoot)
{
base.Add(key, value);
}
}
/// <summary>
/// Removes all entries from the SyncStringDictionary.
/// </summary>
/// <exception cref=”System.NotSupportedException”>The SyncStringDictionary is read-only.</exception>
public override void Clear()
{
lock (this.SyncRoot)
{
base.Clear();
}
}
/// <summary>
/// Determines if the SyncStringDictionary contains a specific key.
/// </summary>
/// <param name=”key”>The key to locate in the SyncStringDictionary.</param>
/// <returns>true if the SyncStringDictionary contains an entry with the specified key; otherwise, false.</returns>
/// <exception cref=”System.ArgumentNullException”><paramref name=”key”/> is null.</exception>
public override bool ContainsKey(string key)
{
lock (this.SyncRoot)
{
return base.ContainsKey(key);
}
}
/// <summary>
/// Determines if the SyncStringDictionary contains a specific value.
/// </summary>
/// <param name=”value”>The value to locate in the SyncStringDictionary. The value can be null.</param>
/// <returns>true if the SyncStringDictionary contains an element with the specified value; otherwise, false.</returns>
public override bool ContainsValue(string value)
{
lock (this.SyncRoot)
{
return base.ContainsValue(value);
}
}
/// <summary>
/// Copies the string dictionary values to a one-dimensional System.Array instance at the specified index.
/// </summary>
/// <param name=”array”>The one-dimensional System.Array that is the destination of the values copied from the SyncStringDictionary.</param>
/// <param name=”index”>The index in the array where copying begins.</param>
/// <exception cref=”System.ArgumentNullException”><paramref name=”array”/> is null.</exception>
/// <exception cref=”System.ArgumentOutOfRangeException”><paramref name=”index”/> is less than the lower bound of array.</exception>
/// <exception cref=”System.ArgumentException”>
/// <paramref name=”array”/> is multidimensional.-or- The number of elements in the SyncStringDictionary
/// is greater than the available space from <paramref name=”index”/> to the end of array.
/// </exception>
public override void CopyTo(Array array, int index)
{
lock (this.SyncRoot)
{
base.CopyTo(array, index);
}
}
/// <summary>
/// Returns an enumerator that iterates through the string dictionary.
/// </summary>
/// <returns>An System.Collections.IEnumerator that iterates through the string dictionary.</returns>
public override System.Collections.IEnumerator GetEnumerator()
{
lock (this.SyncRoot)
{
return base.GetEnumerator();
}
}
//
// Summary:
// Removes the entry with the specified key from the string dictionary.
//
// Parameters:
// key:
// The key of the entry to remove.
//
// Exceptions:
// System.ArgumentNullException:
// The key is null.
//
// System.NotSupportedException:
// The SyncStringDictionary is read-only.
/// <summary>
/// Removes the entry with the specified key from the string dictionary.
/// </summary>
/// <param name=”key”>The key of the entry to remove.</param>
/// <exception cref=”System.ArgumentNullException”><paramref name=”key”/> is null.</exception>
/// <exception cref=”System.NotSupportedException”>The SyncStringDictionary is read-only.</exception>
public override void Remove(string key)
{
lock (this.SyncRoot)
{
base.Remove(key);
}
}
}