// remove key / value pair if the given key exists and has expired
private void CheckExpiration(TKey key)
{
if (LastAccessed.ContainsKey(key) && DateTime.Now - LastAccessed[key] > Timeout)
{
Remove(key);
}
}
public new bool ContainsKey(TKey key)
{
CheckExpiration(key);
if (LastAccessed.ContainsKey(key))
{
LastAccessed[key] = DateTime.Now;
}
return(base.ContainsKey(key));
}
public virtual new bool TryGetValue(TKey key, out TValue value)
{
CheckExpiration(key);
if (LastAccessed.ContainsKey(key))
{
LastAccessed[key] = DateTime.Now;
}
return(base.TryGetValue(key, out value));
}
public virtual new TValue this[TKey key] {
get {
CheckExpiration(key);
if (LastAccessed.ContainsKey(key))
{
LastAccessed[key] = DateTime.Now;
}
return(base[key]);
}
set {
LastAccessed[key] = DateTime.Now;
base[key] = value;
}
}