public void Add(TKey key, TValue value)
{
MruCache <TKey, TValue> .CacheEntry cacheEntry = new MruCache <TKey, TValue> .CacheEntry();
DiagnosticUtility.DebugAssert(null != key, "");
bool flag = false;
try
{
if (this.items.Count == this.highWatermark)
{
int num = this.highWatermark - this.lowWatermark;
for (int i = 0; i < num; i++)
{
TKey tKey = this.mruList.Last.Value;
this.mruList.RemoveLast();
TValue item = this.items[tKey].@value;
this.items.Remove(tKey);
this.OnSingleItemRemoved(item);
}
}
cacheEntry.node = this.mruList.AddFirst(key);
cacheEntry.@value = value;
this.items.Add(key, cacheEntry);
this.mruEntry = cacheEntry;
flag = true;
}
finally
{
if (!flag)
{
this.Clear();
}
}
}
public bool TryGetValue(TKey key, out TValue value)
{
MruCache <TKey, TValue> .CacheEntry cacheEntry;
if (this.mruEntry.node != null && key != null && key.Equals(this.mruEntry.node.Value))
{
value = this.mruEntry.@value;
return(true);
}
bool flag = this.items.TryGetValue(key, out cacheEntry);
value = cacheEntry.@value;
if (flag && this.mruList.Count > 1 && !object.ReferenceEquals(this.mruList.First, cacheEntry.node))
{
this.mruList.Remove(cacheEntry.node);
this.mruList.AddFirst(cacheEntry.node);
this.mruEntry = cacheEntry;
}
return(flag);
}
static DnsCache()
{
DnsCache.ResolveCache = new MruCache <string, DnsCache.DnsCacheEntry>(64);
DnsCache.CacheTimeout = TimeSpan.FromSeconds(2);
}