ns-System.Collections.Specialized.xml

<Namespace Name="System.Collections.Specialized">
  <Docs>
    <summary>The <see cref="N:System.Collections.Specialized" /> namespace contains specialized and strongly-typed collections; for example, a linked list dictionary, a bit vector, and collections that contain only strings.</summary>
    <remarks>
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## Remarks  
 Specialized collections are collections with highly specific purposes. <xref:System.Collections.Specialized.NameValueCollection> is based on <xref:System.Collections.Specialized.NameObjectCollectionBase>; however, <xref:System.Collections.Specialized.NameValueCollection> accepts multiple values per key, whereas <xref:System.Collections.Specialized.NameObjectCollectionBase> accepts only one value per key.  
  
 Some strongly typed collections in the <xref:System.Collections.Specialized> namespace are <xref:System.Collections.Specialized.StringCollection> and <xref:System.Collections.Specialized.StringDictionary>, both of which contain values that are exclusively strings.  
  
 The <xref:System.Collections.Specialized.CollectionsUtil> class creates instances of case-insensitive collections.  
  
 Some collections transform.  For example, the <xref:System.Collections.Specialized.HybridDictionary> class starts as a <xref:System.Collections.Specialized.ListDictionary> and becomes a <xref:System.Collections.Hashtable> when it becomes large.  The <xref:System.Collections.ObjectModel.KeyedCollection%602> is a list but it also creates a lookup dictionary when the number of elements reaches a specified threshold.  
  
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  </Docs>
</Namespace>