/// <summary>
/// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
/// </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.ArgumentNullException">
/// <paramref name="key"/> is null.</exception>
/// <exception cref="T:System.ArgumentException">An element with the same key already exists in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.</exception>
/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IDictionary`2"/> is read-only.</exception>
public override void Add(TKey key, TValue value)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
var weakKey = new WeakKeyReference <TKey>(key, comparer);
dictionary.Add(weakKey, value);
}
/// <summary>
/// Sets the value.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
protected override void SetValue(TKey key, TValue value)
{
WeakReference <TKey> weakKey = new WeakKeyReference <TKey>(key, comparer);
dictionary[weakKey] = value;
}
