/// <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, this.comparer);
this.dictionary.Add(weakKey, value);
}
/// <summary>
/// Returns a hash code for the specified object.
/// </summary>
/// <returns>
/// A hash code for the specified object.
/// </returns>
/// <param name="obj">The <see cref="T:System.Object"/> for which a hash code is to be returned.</param><exception cref="T:System.ArgumentNullException">The type of <paramref name="obj"/> is a reference type and <paramref name="obj"/> is null.</exception>
public int GetHashCode(object obj)
{
WeakKeyReference <T> weakKey = obj as WeakKeyReference <T>;
if (weakKey != null)
{
return(weakKey.HashCode);
}
return(this.comparer.GetHashCode((T)obj));
}
private static T GetTarget(object obj, out bool isDead)
{
WeakKeyReference <T> wref = obj as WeakKeyReference <T>;
T target;
if (wref != null)
{
target = wref.Target;
isDead = !wref.IsAlive;
}
else
{
target = (T)obj;
isDead = false;
}
return(target);
}
/// <summary>
/// Sets the value for the provided key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
protected override void SetValue(TKey key, TValue value)
{
var weakKey = new WeakKeyReference <TKey>(key, this.comparer);
this.dictionary[weakKey] = value;
}
/// <summary>
/// Sets the value for the provided key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
protected override void SetValue(TKey key, TValue value)
{
var weakKey = new WeakKeyReference <TKey>(key, this.comparer);
this.dictionary[weakKey] = LogoFX.Core.WeakReference <TValue> .Create(value);
}