private void Insert(TKey key, TValue value, bool add)
{
if (key == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
if (buckets == null)
{
Initialize(0);
}
int hashCode = comparer.GetHashCode(key) & 0x7FFFFFFF;
int targetBucket = hashCode % buckets.Length;
#if FEATURE_RANDOMIZED_STRING_HASHING
int collisionCount = 0;
#endif
for (int i = buckets[targetBucket]; i >= 0; i = entries[i].next)
{
if (entries[i].hashCode == hashCode && comparer.Equals(entries[i].key, key))
{
if (add)
{
ThrowHelper.ThrowAddingDuplicateWithKeyArgumentException(key);
}
entries[i].value = value;
version++;
return;
}
#if FEATURE_RANDOMIZED_STRING_HASHING
collisionCount++;
#endif
}
int index;
if (freeCount > 0)
{
index = freeList;
freeList = entries[index].next;
freeCount--;
}
else
{
if (count == entries.Length)
{
Resize();
targetBucket = hashCode % buckets.Length;
}
index = count;
count++;
}
entries[index].hashCode = hashCode;
entries[index].next = buckets[targetBucket];
entries[index].key = key;
entries[index].value = value;
buckets[targetBucket] = index;
version++;
#if FEATURE_RANDOMIZED_STRING_HASHING
// In case we hit the collision threshold we'll need to switch to the comparer which is using randomized string hashing
// in this case will be EqualityComparer<string>.Default.
// Note, randomized string hashing is turned on by default on coreclr so EqualityComparer<string>.Default will
// be using randomized string hashing
if (collisionCount > HashHelpers.HashCollisionThreshold && comparer == NonRandomizedStringEqualityComparer.Default)
{
comparer = (IEqualityComparer <TKey>)EqualityComparer <string> .Default;
Resize(entries.Length, true);
}
#endif
}
