C# SortedList类概念和示例

[SerializableAttribute]
[ComVisibleAttribute(false)]
public class SortedList<TKey, TValue> : IDictionary<TKey, TValue>, 
    ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, 
    IDictionary, ICollection, IEnumerable

 1 using System;  2 using System.Collections.Generic;  3  4 public class Example  5 {  6 public static void Main()  7  {  8 // Create a new sorted list of strings, with string  9 // keys.  10 SortedList<string, string> openWith =  11 new SortedList<string, string>();  12  13 // Add some elements to the list. There are no  14 // duplicate keys, but some of the values are duplicates.  15 openWith.Add("txt", "notepad.exe");  16 openWith.Add("bmp", "paint.exe");  17 openWith.Add("dib", "paint.exe");  18 openWith.Add("rtf", "wordpad.exe");  19  20 // The Add method throws an exception if the new key is  21 // already in the list.  22 try  23  {  24 openWith.Add("txt", "winword.exe");  25  }  26 catch (ArgumentException)  27  {  28 Console.WriteLine("An element with Key = \"txt\" already exists.");  29  }  30  31 // The Item property is another name for the indexer, so you  32 // can omit its name when accessing elements.   33 Console.WriteLine("For key = \"rtf\", value = {0}.",  34 openWith["rtf"]);  35  36 // The indexer can be used to change the value associated  37 // with a key.  38 openWith["rtf"] = "winword.exe";  39 Console.WriteLine("For key = \"rtf\", value = {0}.",  40 openWith["rtf"]);  41  42 // If a key does not exist, setting the indexer for that key  43 // adds a new key/value pair.  44 openWith["doc"] = "winword.exe";  45  46 // The indexer throws an exception if the requested key is  47 // not in the list.  48 try  49  {  50 Console.WriteLine("For key = \"tif\", value = {0}.",  51 openWith["tif"]);  52  }  53 catch (KeyNotFoundException)  54  {  55 Console.WriteLine("Key = \"tif\" is not found.");  56  }  57  58 // When a program often has to try keys that turn out not to  59 // be in the list, TryGetValue can be a more efficient  60 // way to retrieve values.  61 string value = "";  62 if (openWith.TryGetValue("tif", out value))  63  {  64 Console.WriteLine("For key = \"tif\", value = {0}.", value);  65  }  66 else  67  {  68 Console.WriteLine("Key = \"tif\" is not found.");  69  }  70  71 // ContainsKey can be used to test keys before inserting  72 // them.  73 if (!openWith.ContainsKey("ht"))  74  {  75 openWith.Add("ht", "hypertrm.exe");  76 Console.WriteLine("Value added for key = \"ht\": {0}",  77 openWith["ht"]);  78  }  79  80 // When you use foreach to enumerate list elements,  81 // the elements are retrieved as KeyValuePair objects.  82  Console.WriteLine();  83 foreach( KeyValuePair<string, string> kvp in openWith )  84  {  85 Console.WriteLine("Key = {0}, Value = {1}",  86  kvp.Key, kvp.Value);  87  }  88  89 // To get the values alone, use the Values property.  90 IList<string> ilistValues = openWith.Values;  91  92 // The elements of the list are strongly typed with the  93 // type that was specified for the SorteList values.  94  Console.WriteLine();  95 foreach( string s in ilistValues )  96  {  97 Console.WriteLine("Value = {0}", s);  98  }  99 100 // The Values property is an efficient way to retrieve 101 // values by index. 102 Console.WriteLine("\nIndexed retrieval using the Values " + 103 "property: Values[2] = {0}", openWith.Values[2]); 104 105 // To get the keys alone, use the Keys property. 106 IList<string> ilistKeys = openWith.Keys; 107 108 // The elements of the list are strongly typed with the 109 // type that was specified for the SortedList keys. 110  Console.WriteLine(); 111 foreach( string s in ilistKeys ) 112  { 113 Console.WriteLine("Key = {0}", s); 114  } 115 116 // The Keys property is an efficient way to retrieve 117 // keys by index. 118 Console.WriteLine("\nIndexed retrieval using the Keys " + 119 "property: Keys[2] = {0}", openWith.Keys[2]); 120 121 // Use the Remove method to remove a key/value pair. 122 Console.WriteLine("\nRemove(\"doc\")"); 123 openWith.Remove("doc"); 124 125 if (!openWith.ContainsKey("doc")) 126  { 127 Console.WriteLine("Key \"doc\" is not found."); 128  } 129  } 130 } 131 // http://www.cnblogs.com/roucheng/ 132 /* This code example produces the following output: 133 134 An element with Key = "txt" already exists. 135 For key = "rtf", value = wordpad.exe. 136 For key = "rtf", value = winword.exe. 137 Key = "tif" is not found. 138 Key = "tif" is not found. 139 Value added for key = "ht": hypertrm.exe 140 141 Key = bmp, Value = paint.exe 142 Key = dib, Value = paint.exe 143 Key = doc, Value = winword.exe 144 Key = ht, Value = hypertrm.exe 145 Key = rtf, Value = winword.exe 146 Key = txt, Value = notepad.exe 147 148 Value = paint.exe 149 Value = paint.exe 150 Value = winword.exe 151 Value = hypertrm.exe 152 Value = winword.exe 153 Value = notepad.exe 154 155 Indexed retrieval using the Values property: Values[2] = winword.exe 156 157 Key = bmp 158 Key = dib 159 Key = doc 160 Key = ht 161 Key = rtf 162 Key = txt 163 164 Indexed retrieval using the Keys property: Keys[2] = doc 165 166 Remove("doc") 167 Key "doc" is not found. 168 */