C# 0 The Complete Reference

Hashtable

 contains a key, call 

ContainsKey( )

. To see if a specific value 

is stored, call 

ContainsValue( )

. To enumerate the contents of a 

Hashtable

, obtain an 

IDictionaryEnumerator

 by calling 

GetEnumerator( )

. Recall that 

IDictionaryEnumerator

is used to enumerate the contents of a collection that stores key/value pairs.

The public properties available in 

Hashtable

 are those defined by the interfaces that 

it implements. Two especially important ones are 

Keys

 and 

Values

 because they let you 

obtain a collection of a 

Hashtable

’s keys or values. They are specified by 

IDictionary

 and 

are shown here:

public virtual ICollection Keys { get; }

public virtual ICollection Values { get; }

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PART II

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C o l l e c t i o n s ,   E n u m e r a t o r s ,   a n d   I t e r a t o r s    

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Because

Hashtable

 does not maintain an ordered collection, there is no specific order to 

the collection of keys or values obtained. 

Hashtable

 also has two protected properties: