/// <summary>
/// Compares the existing value for the specified key with a specified value,
/// and if they are equal, updates the key with a third value.
/// </summary>
/// <param name="key">The key whose value is compared with comparisonValue and possibly replaced.</param>
/// <param name="newValue">The value that replaces the value of the element with key if the comparison results in equality</param>
/// <param name="comparisonValue">The value that is compared to the value of the element with key</param>
/// <returns>true if the value with key was equal to comparisonValue and replaced with newValue; otherwise, false.</returns>
public bool TryUpdate(TKey key, TValue newValue, TValue comparisonValue)
{
bool flag;
using (UpgradeableReadLock.Enter(readerWriterLock))
{
TValue local;
if (!dictionary.TryGetValue(key, out local))
{
return(false);
}
if (!local.Equals(comparisonValue))
{
flag = false;
}
else
{
using (WriteLock.Enter(readerWriterLock))
{
dictionary[key] = newValue;
flag = true;
}
}
}
return(flag);
}
/// <summary>
/// Adds a key/value pair to the <see cref="T:ExitGames.Threading.SynchronizedDictionary`2"/> if the key
/// does not already exist
/// </summary>
/// <param name="key">The key of the element to get or add.</param>
/// <param name="valueFactory">The function used to generate a value for the key</param>
/// <returns>The value for the key. This will be either the existing value for the key if the
/// key is already in the dictionary, or the new value for the key as returned by valueFactory
/// if the key was not in the dictionary.</returns>
public TValue GetOrAdd(TKey key, Func <TKey, TValue> valueFactory)
{
TValue local2;
using (UpgradeableReadLock.Enter(readerWriterLock))
{
TValue local;
if (dictionary.TryGetValue(key, out local))
{
local2 = local;
}
else
{
using (WriteLock.Enter(readerWriterLock))
{
local = valueFactory(key);
dictionary.Add(key, local);
local2 = local;
}
}
}
return(local2);
}
