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IDictionary, IDictionary<TKey, TValue>, ICollection, ICollection< KeyValuePair<TKey, TValue>>, IEnumerable, and IEnumerable< KeyValuePair<TKey, TValue>> The size of a SortedList<TKey, TValue> is dynamic and will automatically grow as needed SortedList<TValue, TKey> is similar to SortedDictionary<TKey, TValue> but has different performance characteristics For example, a SortedList<TKey, TValue> uses less memory, but a SortedDictionary<TKey, TValue> is faster when inserting out-of-order elements SortedList<TKey, TValue> provides many constructors Here is a sampling: public SortedList( ) public SortedList(IDictionary<TKey, TValue> dictionary) public SortedList(int capacity) public SortedList(IComparer<TKey> comparer) The first constructor creates an empty list with a default capacity The second creates a list that contains the same elements as those in dictionary The third lets you specify an initial capacity If you know in advance that you will need a list of a certain size, then specifying that capacity will prevent the resizing of the list at runtime, which is a costly process The fourth form lets you specify a comparison method that will be used to compare the objects contained in the list The capacity of a SortedList<TKey, TValue> list grows automatically as needed when elements are added to the list When the current capacity is exceeded, the capacity is increased The advantage of specifying a capacity is that you can prevent or minimize the overhead associated with resizing the collection Of course, it makes sense to specify an initial capacity only if you have some idea of how many elements will be stored In addition to the methods defined by the interfaces that it implements, SortedList<TKey, TValue> also defines several methods of its own A sampling is shown in Table 25-19 Notice the enumerator returned by GetEnumerator( ) enumerates the key/value pairs stored in the list as objects of type KeyValuePair In addition to the properties defined by the interfaces that it implements, SortedList<TKey, TValue> defines the following properties:.

Property public int Capacity { get; set; } public IComparer<TKey> Comparer { get; } public IList<TKey> Keys { get; } public IList<TValue> Values { get; } Description Obtains or sets the capacity of the invoking list Obtains the comparer for the invoking list Obtains a collection of the keys Obtains a collection of the values

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SortedList<TKey, TValue> defines the following indexer (which is defined by IDictionary<TKey, TValue>): public TValue this[TKey key] { get; set; } You can use this indexer to get or set the value of an element You can also use it to add a new element to the collection Notice that the index is not actually an index, but rather the key of the item

25:

Method public void Add(TKey key, TValue value)

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Description Adds the key/value pair specified by key and value to the list If the key is already in the list, then its value is unchanged and an ArgumentException is thrown key must not be null Returns true if key is a key in the invoking list Returns false otherwise Returns true if value is a value in the invoking list Returns false otherwise Returns an enumerator for the invoking list

public bool ContainsKey(TKey key) public bool ContainsValue(TValue value) public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator( ) public int IndexOfKey(TKey key) public int IndexOfValue(TValue value) public bool Remove(TKey key) public void RemoveAt(int index) public void TrimExcess( )

TABLE 25-19

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Returns the index of the key specified by key Returns 1 if the key is not in the list Returns the index of the first occurrence of the value specified by value Returns 1 if the value is not in the list Removes the key/value pair associated with key from the list Returns true if successful Returns false if key is not in the list Removes the key/value pair at the index specified by index Removes the excess capacity of the invoking list

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Here is an example that demonstrates SortedList<TKey, TValue> It reworks the employee database example one more time In this version, the database is stored in a SortedList

// Demonstrate a SortedList<TKey, TValue> using System; using SystemCollectionsGeneric; class GenSLDemo { static void Main() { // Create a SortedList for // employee names and salary SortedList<string, double> sl = new SortedList<string, double>(); // Add elements to the collection slAdd("Butler, John", 73000); slAdd("Swartz, Sarah", 59000); slAdd("Pyke, Thomas", 45000); slAdd("Frank, Ed", 99000);

Part II:

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// Get a collection of the keys ICollection<string> c = slKeys; // Use the keys to obtain the values foreach(string str in c) ConsoleWriteLine("{0}, Salary: {1:C}", str, sl[str]); ConsoleWriteLine(); } }

The output is shown here:

Butler, John, Salary: $73,00000 Frank, Ed, Salary: $99,00000 Pyke, Thomas, Salary: $45,00000 Swartz, Sarah, Salary: $59,00000