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Constructor
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SortedDictionary<TKey, TVal>()
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Description
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Creates a SortedDictionary<TKey, TVal> using the default IComparer<TKey> to sort the keys Creates a SortedDictionary<TKey, TVal> using the specified IComparer<TKey> to sort the keys
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SortedDictionary<TKey, TVal>(IComparer(TKey)
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SortedDictionary<TKey, TVal>(IDictionary<TKey, TVal>, IComparer<TKey>)
Generic Sets
Sets are collections that have no duplicate items, and in general, the items are in no particular order. As a programming tool, the .NET generic sets are most useful because they allow you to compare one collection of objects with another. You can determine which elements two collections have in common, if one collection is a superset or subset of another collection, and which elements are unique to one of the collections. Sets are not as widely used as some of the generic collections, but they can be a real time-saver when you need them.
The ISet<T> Interface
The ISet<T> interface allows you to work with different set collection implementations in a consistent manner. The members of the ISet<T> interface are described in Table 19-23. Table 19-23. The Members of the ISet<T> Interface
Member
Add(T) ExceptWith(IEnumerable<T>)
Description
Adds an item to the set Removes all the items in the IEnumerable<T> from the set Modifies the set so that it contains only the elements that are also in the IEnumerable<T> Returns true if the IEnumerable<T> contains one or more items that are not in the set Returns true if the set has at least one item that is not in the IEnumerable<T> Returns true if the IEnumerable<T> contains zero or more items that are not in the set
IntersetWith(IEnumerable<T>)
IsProperSubsetOf(IEnumerable<T>)
IsProperSupersetOf(IEnumerable<T>)
IsSubsetOf(IEnumerable<T>)
CHAPTER 19 COLLECTIONS
Member
IsSupersetOf(IEnumerable<T>)
Description
Returns true if the set contains zero or more items that are not in the IEnumerable<T> Returns true if the set and the IEnumerable<T> contain one or more items in common Returns true if the set and the IEnumerable<T> contain the same elements Modifies the set so that it contains items that are in the set and in the IEnumerable<T> but not those items that are in both Modifies the set so that it contains the elements that are in both the set and the IEnumerable<T>
Overlaps(IEnumerable<T>)
SetEquals(IEnumerable<T>)
SymmetricExceptWith(IEnumerable<T>)
UnionWith<IEnumerable<T>)
Using ISet<T> is pretty straightforward. Listing 19-25 demonstrates some of the more useful members, using the HashSet<T> collection class (which I describe in the next section of this chapter). Listing 19-25. Working with the ISet<T> Interface using System; using System.Collections.Generic; namespace Listing 25 { class Listing 25 { static void Main(string[] args) { // create the ISet<T> ISet<string> set = new HashSet<string>() { "apple", "banana", "cherry" }; // create the other collection IEnumerable<string> otherCollection = new string[] { "banana", "strawberry", "pear", "cherry", "apple" }; // use the proper superset and subset methods bool result1 = set.IsProperSubsetOf(otherCollection); bool result2 = set.IsProperSupersetOf(otherCollection); // write out the results Console.WriteLine("IsProperSubset: {0}, IsProperSuperset: {1}", result1, result2); // use the regular superset and subset methods bool result3 = set.IsSubsetOf(otherCollection);
CHAPTER 19 COLLECTIONS
bool result4 = set.IsSupersetOf(otherCollection); // write out the results Console.WriteLine("IsSubset: {0}, IsSuperset: {1}", result3, result4); // use the overlaps methods bool result5 = set.Overlaps(otherCollection); Console.WriteLine("Overlaps: {0}", result5); // get the interset set.IntersectWith(otherCollection); // enumerate the (intersected) set foreach (string s in set) { Console.WriteLine("Set Item: {0}", s); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } } Compiling and running the code in Listing 19-25 gives the following results: IsProperSubset: True, IsProperSuperset: False IsSubset: True, IsSuperset: False Overlaps: True Set Item: apple Set Item: banana Set Item: cherry Press enter to finish
The HashSet<T> Collection
The HashSet<T> class is the standard implementation of the ISet<T> interface. The constructors for HashSet<T> are described in Table 19-24. Sets don t contain duplicate items, so HashSet<T> uses the IEqualityComparer<T> interface to determine equality between collections items. If you don t provide an implementation of IEqualityComparer<T>, then the default is used for the collection item type. I describe the IEqualityComparer<T> interface later in the chapter.
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