Hashtable Constructor (Int32, Single, IHashCodeProvider, IComparer)
NOTE: This API is now obsolete.
Initializes a new, empty instance of the Hashtable class using the specified initial capacity, load factor, hash code provider, and comparer.
Assembly: mscorlib (in mscorlib.dll)
public function Hashtable( capacity : int, loadFactor : float, hcp : IHashCodeProvider, comparer : IComparer )
- Type: System.Int32
The approximate number of elements that the Hashtable object can initially contain.
- Type: System.Single
A number in the range from 0.1 through 1.0 that is multiplied by the default value which provides the best performance. The result is the maximum ratio of elements to buckets.
- Type: System.Collections.IHashCodeProvider
a null reference (Nothing in Visual Basic) to use the default hash code provider, which is each key's implementation of Object.GetHashCode.
capacity is less than zero.
loadFactor is less than 0.1.
loadFactor is greater than 1.0.
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. A load factor of 1.0 is the best balance between speed and size.
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 custom hash code provider and the custom comparer enable scenarios such as doing lookups with case-insensitive strings.
This constructor is an O(n) operation, where n is the capacity parameter.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET FrameworkSupported in: 1.1, 1.0
Obsolete (compiler warning) in 3.5
Obsolete (compiler warning) in 3.5 SP1
Obsolete (compiler warning) in 3.0
Obsolete (compiler warning) in 3.0 SP1
Obsolete (compiler warning) in 3.0 SP2
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 2.0 SP1
Obsolete (compiler warning) in 2.0 SP2