System.Core 3.5.0.0 4.0.0.0 System.Object System.Collections.Generic.IEnumerable<System.Linq.IGrouping<TKey,TElement>> System.Linq.ILookup<TKey,TElement> To be added. To be added. A resembles a . The difference is that a maps keys to single values, whereas a maps keys to collections of values. You can create an instance of a by calling on an object that implements . There is no public constructor to create a new instance of a . Additionally, objects are immutable, that is, you cannot add or remove elements or keys from a object after it has been created.

Represents a collection of keys each mapped to one or more values.

Method 3.5.0.0 4.0.0.0 System.Collections.Generic.IEnumerable<TResult> To be added. To be added.

To be added.

To be added. To be added. Method 3.5.0.0 4.0.0.0 System.Boolean To be added.

To be added.

To be added. To be added. Property 3.5.0.0 4.0.0.0 System.Int32 To be added. The value of the property does not change because items cannot be added to or removed from a object after it has been created.

Gets the number of key/value collection pairs in the .

Method 3.5.0.0 4.0.0.0 System.Collections.Generic.IEnumerator<System.Linq.IGrouping<TKey,TElement>> To be added.

Returns a generic enumerator that iterates through the .

An enumerator for the . Property 3.5.0.0 4.0.0.0 System.Collections.Generic.IEnumerable<TElement> To be added.

To be added.

To be added. To be added. Method 3.5.0.0 4.0.0.0 System.Collections.IEnumerator To be added.

Returns an enumerator that iterates through the . This class cannot be inherited.

An enumerator for the .