Hashtable Constructor (Int32)

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Initializes a new, empty instance of the Hashtable class using the specified initial capacity, and the default load factor, hash code provider, and comparer.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

public:
Hashtable(
	int capacity
)

Parameters

capacity
Type: System..::..Int32
The approximate number of elements that the Hashtable object can initially contain.

ExceptionCondition
ArgumentOutOfRangeException

capacity is less than zero.

Specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the Hashtable object. Capacity is automatically increased as required based on the load factor.

The load factor is the maximum ratio of elements to buckets. A smaller load factor means faster lookup at the cost of increased memory consumption.

When the actual load factor reaches the specified 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 Object..::..GetHashCode.

The comparer determines whether two keys are equal. Every key in a Hashtable must be unique. The default comparer is the key's implementation of Object..::..Equals.

This constructor is an O(n) operation, where n is capacity.

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