Creates a new Hashtable with the specified initial capacity and the default load factor, using the default hash code provider and the default comparer.
[Visual Basic] Overloads Public Sub New( _ ByVal capacity As Integer _ ) [C#] public Hashtable( int capacity ); [C++] public: Hashtable( int capacity ); [JScript] public function Hashtable( capacity : int );
Exception Type | Condition |
---|---|
ArgumentOutOfRangeException | capacity is less than zero. |
Specifying the initial capacity eliminates a number of resizing operations that would otherwise be performed while adding entries to the Hashtable. Capacity is increased as the number of buckets is increased based on the load factor.
The maximum load factor is the maximum ratio of entries to buckets. A smaller load factor means faster lookup at the cost of increased memory consumption. The default maximum load factor is 1.0, which is the best balance between speed and size.
When the actual load factor reaches the maximum load factor, the number of buckets is automatically increased to the smallest prime number that is larger than twice the current number of buckets.
The hash code provider dispenses hash codes for keys in the Hashtable. The default hash code provider is the key's implementation of GetHashCode.
The comparer is used to determine if two keys are equal. Every key in a Hashtable must be unique. The default comparer is the key's implementation of Equals.
Hashtable Class | Hashtable Members | System.Collections Namespace | Hashtable Constructor Overload List | GetHashCode | Equals