barcode generator c# source code Several Commonly Used Methods De ned by Dictionary<TKey, TValue> in C#

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Several Commonly Used Methods De ned by Dictionary<TKey, TValue>
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Part II:
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Exploring the C# Library
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In addition to the properties defined by the interfaces that it implements, Dictionary<TKey, TValue> defines these properties:
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Property public IEqualityComparer<TKey> Comparer { get; } public Dictionary<TKey, TValue>KeyCollection Keys { get; } public Dictionary<TKey, TValue>ValueCollection Values { get; } Description Obtains the comparer for the invoking dictionary Obtains a collection of the keys Obtains a collection of the values
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Notice that the keys and values contained within the collection are available as separate lists through the Keys and Values properties The types Dictionary<TKey, TValue>KeyCollection and Dictionary<TKey, TValue>ValueCollection are collections that implement both the generic and non-generic forms of ICollection and IEnumerable The following indexer, defined by IDictionary<TKey, TValue>, is implemented by Dictionary<TKey, TValue> as shown here: 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 When enumerating the collection, Dictionary<TKey, TValue> returns key/value pairs in the form of a KeyValuePair<TKey, TValue> structure Recall that this structure defines the following two properties: public TKey Key { get; } public TValue Value { get; } These properties obtain the key or value associated with an entry However, most of the time you won t need to use KeyValuePair<TKey, TValue> directly because Dictionary<TKey, TValue> allows you to work the keys and values individually However, when enumerating a Dictionary<TKey, TValue>, such as in a foreach loop, the objects being enumerated are KeyValuePairs In a Dictionary<TKey, TValue>, all keys must be unique, and a key must not change while it is in use as a key Values need not be unique The objects in a Dictionary<TKey, TValue> are not stored in sorted order Here is an example that demonstrates Dictionary<TKey, TValue>:
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// Demonstrate the generic Dictionary<TKey, TValue> class using System; using SystemCollectionsGeneric;
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25:
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Collections, Enumerators, and Iterators
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class GenDictionaryDemo { static void Main() { // Create a Dictionary that holds employee // names and their corresponding salary Dictionary<string, double> dict = new Dictionary<string, double>(); // Add elements to the collection dictAdd("Butler, John", 73000); dictAdd("Swartz, Sarah", 59000); dictAdd("Pyke, Thomas", 45000); dictAdd("Frank, Ed", 99000);
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PART II
// Get a collection of the keys (names) ICollection<string> c = dictKeys; // Use the keys to obtain the values (salaries) foreach(string str in c) ConsoleWriteLine("{0}, Salary: {1:C}", str, dict[str]); } }
Here is the output:
Butler, John, Salary: $73,00000 Swartz, Sarah, Salary: $59,00000 Pyke, Thomas, Salary: $45,00000 Frank, Ed, Salary: $99,00000
The SortedDictionary<TKey, TValue> Class
The SortedDictionary<TKey, TValue> class stores key/value pairs and is similar to Dictionary<TKey, TValue> except that it is sorted by key SortedDictionary<TKey, TValue> implements IDictionary, IDictionary<TKey, TValue>, ICollection, ICollection<KeyValuePair<TKey, TValue>>, IEnumerable, and IEnumerable<KeyValuePair<TKey, TValue>> SortedDictionary<TKey, TValue> provides the following constructors: public SortedDictionary( ) public SortedDictionary(IDictionary<TKey, TValue> dictionary) public SortedDictionary(IComparer<TKey> comparer) public SortedDictionary(IDictionary<TKey, TValue> dictionary, IComparer<TKey> comparer) The first constructor creates an empty dictionary The second creates a dictionary that contains the same elements as those in dictionary The third lets you specify the IComparer that the dictionary will use for sorting, and the fourth lets you initialize the dictionary and specify the IComparer SortedDictionary<TKey, TValue> defines several methods A sampling is shown in Table 25-18
Part II:
Exploring the C# Library
Method public void Add(TKey key, TValue value)
Description Adds the key/value pair specified by key and value to the dictionary If the key is already in the dictionary, 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 dictionary Returns false otherwise Returns true if value is a value in the invoking dictionary Returns false otherwise Removes key from the dictionary Returns true if successful Returns false if key was not in the dictionary
public bool ContainsKey(TKey key) public bool ContainsValue(TValue value) public bool Remove(TKey key)
TABLE 25-18
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