Hashtable Constructor (IDictionary, IEqualityComparer)
Assembly: mscorlib (in mscorlib.dll)
- Type: System.Collections.IEqualityComparer
a null reference (Nothing in Visual Basic) to use the default hash code provider and the default comparer. The default hash code provider is each key's implementation of Object.GetHashCode and the default comparer is each key's implementation of Object.Equals.
The initial capacity is set to the number of elements in the source dictionary. 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 IEqualityComparer object includes both the hash code provider and the comparer. If an IEqualityComparer is used in the Hashtable constructor, the objects used as keys in the Hashtable object are not required to override the Object.GetHashCode and Object.Equals methods.
The IEqualityComparer enables scenarios such as doing lookups with case-insensitive strings.
This constructor is an O(n) operation, where n is the number of elements in the d parameter.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.