qr code generator api c# A Sampling of Methods De ned by LinkedList<T> in C#.NET

Draw QR Code in C#.NET A Sampling of Methods De ned by LinkedList<T>

TABLE 24-15 A Sampling of Methods De ned by LinkedList<T>
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24:
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Collections, Enumerators, and Iterators
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Method public void Remove(LinkedList<T> n) public void RemoveFirst( ) public void RemoveLast( )
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Description Removes the node that matches n Throws an InvalidOperationException if n is not in the list Removes the first node in the list Removes the last node in the list
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TABLE 24-15 A Sampling of Methods De ned by LinkedList<T> (continued)
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Here is an example that demonstrates the LinkedList<T> class:
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// Demonstrate LinkedList<T> using System; using SystemCollectionsGeneric; class GenLinkedListDemo { static void Main() { // Create a linked list LinkedList<char> ll = new LinkedList<char>(); ConsoleWriteLine("Initial number of elements: " + llCount); ConsoleWriteLine(); ConsoleWriteLine("Adding 5 elements"); // Add elements to the linked list llAddFirst('A'); llAddFirst('B'); llAddFirst('C'); llAddFirst('D'); llAddFirst('E'); ConsoleWriteLine("Number of elements: " + llCount); // Display the linked list by manually walking // through the list LinkedListNode<char> node; ConsoleWrite("Display contents by following links: "); for(node = llFirst; node != null; node = nodeNext) ConsoleWrite(nodeValue + " "); ConsoleWriteLine("\n"); //Display the linked list by use of a foreach loop ConsoleWrite("Display contents with foreach loop: "); foreach(char ch in ll) ConsoleWrite(ch + " "); ConsoleWriteLine("\n");
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Exploring the C# Library
// Display the list backward by manually walking // from last to first ConsoleWrite("Follow links backwards: "); for(node = llLast; node != null; node = nodePrevious) ConsoleWrite(nodeValue + " "); ConsoleWriteLine("\n"); // Remove two elements ConsoleWriteLine("Removing 2 elements"); // Remove elements from the linked list llRemove('C'); llRemove('A'); ConsoleWriteLine("Number of elements: " + llCount); // Use foreach loop to display the modified list ConsoleWrite("Contents after deletion: "); foreach(char ch in ll) ConsoleWrite(ch + " "); ConsoleWriteLine("\n"); // Add three elements to the end of the list llAddLast('X'); llAddLast('Y'); llAddLast('Z'); ConsoleWrite("Contents after addition to end: "); foreach(char ch in ll) ConsoleWrite(ch + " "); ConsoleWriteLine("\n"); } }
Here is the output:
Initial number of elements: 0 Adding 5 elements Number of elements: 5 Display contents by following links: E D C B A Display contents with foreach loop: E D C B A Follow links backwards: A B C D E Removing 2 elements Number of elements: 3 Contents after deletion: E D B Contents after addition to end: E D B X Y Z
24:
Collections, Enumerators, and Iterators
Perhaps the most important thing to notice in this program is that the list is traversed in both the forward and backward direction by following the links provided by the Next and Previous properties The bidirectional property of doubly linked lists is especially important in applications such as databases in which the ability to move efficiently through the list in both directions is often necessary
The Dictionary<TK, TV> Class
The Dictionary<TK, TV> class stores key/value pairs In a dictionary, values are accessed through their keys In this regard, it is similar to the non-generic Hashtable class Dictionary<TK, TV> implements IDictionary, IDictionary<TV, TV>, ICollection, ICollection<KeyValuePair<TK, TV>>, IEnumerable, IEnumerable<KeyValuePair<TK, TV>>, ISerializable, and IDeserializationCallback (The last two interfaces support the serialization of the list) Dictionaries are dynamic, growing as needed Dictionary<TK, TV> provides many constructors Here is a sampling: public Dictionary( ) public Dictionary(IDictionary<TK, TV> dict) public Dictionary(int capacity) The first constructor creates an empty dictionary with a default capacity The second creates a dictionary that contains the same elements as those in dict The third lets you specify an initial capacity If you know in advance that you will need a dictionary of a certain size, then specifying that capacity will prevent the resizing of the dictionary at runtime, which is a costly process Dictionary<TK, TV> defines several methods Some commonly used ones are shown in Table 24-16
PART II
Method public void Add(TK k, TV v)
Description Adds the key/value pair specified by k and v to the dictionary If k is already in the dictionary, then its value is unchanged and an ArgumentException is thrown Returns true if k is a key in the invoking dictionary Returns false otherwise Returns true if v is a value in the invoking dictionary Returns false otherwise Returns an enumerator for the invoking dictionary Removes k from the dictionary Returns true if successful Returns false if k was not in the dictionary
public bool ContainsKey(TK k) public bool ContainsValue(TV v) public IDictionaryEnumerator<TK, TV> GetEnumerator( ) public bool Remove(TK k)
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