SortedDictionary.System.Collections.IDictionary.Add メソッド
アセンブリ: System (system.dll 内)

Private Sub System.Collections.IDictionary.Add ( _ key As Object, _ value As Object _ ) Implements IDictionary.Add
Dim instance As SortedDictionary(Of TKey, TValue) Dim key As Object Dim value As Object CType(instance, IDictionary).Add(key, value)
private: virtual void System.Collections.IDictionary.Add ( Object^ key, Object^ value ) sealed = IDictionary::Add


Item プロパティを使用すると、ディクショナリ内に存在しないキーの値を設定することで、新しい要素を追加することもできます (例 : myCollection["myNonexistentKey"] = myValue)。ただし、指定したキーがディクショナリに既に存在する場合、Item プロパティを設定すると、既存の値が上書きされます。対照的に、Add メソッドは既存の要素を変更しません。

System.Collections.IDictionary インターフェイスを使って SortedDictionary クラスにアクセスする方法を次のコード例に示します。このコード例では、文字列キーを含む文字列の空の SortedDictionary を作成し、System.Collections.IDictionary.Add メソッドを使用していくつかの要素を追加します。この例では、重複するキーを追加しようとした場合、またはデータ型が適切でないキーや値を指定した場合に、System.Collections.IDictionary.Add メソッドによって ArgumentException がスローされることを示しています。
このコード例では、System.Collections.IDictionary インターフェイスにあるその他いくつかのメンバについても使用方法を示しています。
Imports System Imports System.Collections Imports System.Collections.Generic Public Class Example Public Shared Sub Main() ' Create a new sorted dictionary of strings, with string keys , ' and access it using the IDictionary interface. ' Dim openWith As IDictionary = _ New SortedDictionary(Of String, String) ' Add some elements to the dictionary. There are no ' duplicate keys, but some of the values are duplicates. ' IDictionary.Add throws an exception if incorrect types ' are supplied for key or value. openWith.Add("txt", "notepad.exe") openWith.Add("bmp", "paint.exe") openWith.Add("dib", "paint.exe") openWith.Add("rtf", "wordpad.exe") Try openWith.Add(42, New Example()) Catch ex As ArgumentException Console.WriteLine("An exception was caught for " & _ "IDictionary.Add. Exception message:" & vbLf _ & vbTab & ex.Message & vbLf) End Try ' The Add method throws an exception if the new key is ' already in the dictionary. Try openWith.Add("txt", "winword.exe") Catch Console.WriteLine("An element with Key = ""txt"" already exists.") End Try ' The Item property is the default property, so you ' can omit its name when accessing elements. Console.WriteLine("For key = ""rtf"", value = {0}.", _ openWith("rtf")) ' The default Item property can be used to change the value ' associated with a key. openWith("rtf") = "winword.exe" Console.WriteLine("For key = ""rtf"", value = {0}.", _ openWith("rtf")) ' If a key does not exist, setting the default Item property ' for that key adds a new key/value pair. openWith("doc") = "winword.exe" ' The default Item property returns Nothing if the key ' is of the wrong data type. Console.WriteLine("The default Item property returns Nothing" _ & " if the key is of the wrong type:") Console.WriteLine("For key = 2, value = {0}.", _ openWith(2)) ' The default Item property throws an exception when setting ' a value if the key is of the wrong data type. Try openWith(2) = "This does not get added." Catch Console.WriteLine("A key of the wrong type was specified" _ & " when setting the default Item property.") End Try ' Unlike the default Item property on the Dictionary class ' itself, IDictionary.Item does not throw an exception ' if the requested key is not in the dictionary. Console.WriteLine("For key = ""tif"", value = {0}.", _ openWith("tif")) ' Contains can be used to test keys before inserting ' them. If Not openWith.Contains("ht") Then openWith.Add("ht", "hypertrm.exe") Console.WriteLine("Value added for key = ""ht"": {0}", _ openWith("ht")) End If ' IDictionary.Contains returns False if the wrong data ' type is supplied. Console.WriteLine("openWith.Contains(29.7) returns {0}", _ openWith.Contains(29.7)) ' When you use foreach to enumerate dictionary elements ' with the IDictionary interface, the elements are retrieved ' as DictionaryEntry objects instead of KeyValuePair objects. Console.WriteLine() For Each de As DictionaryEntry In openWith Console.WriteLine("Key = {0}, Value = {1}", _ de.Key, de.Value) Next ' To get the values alone, use the Values property. Dim icoll As ICollection = openWith.Values ' The elements of the collection are strongly typed ' with the type that was specified for dictionary values, ' even though the ICollection interface is not strongly ' typed. Console.WriteLine() For Each s As String In icoll Console.WriteLine("Value = {0}", s) Next s ' To get the keys alone, use the Keys property. icoll = openWith.Keys ' The elements of the collection are strongly typed ' with the type that was specified for dictionary keys, ' even though the ICollection interface is not strongly ' typed. Console.WriteLine() For Each s As String In icoll Console.WriteLine("Key = {0}", s) Next s ' Use the Remove method to remove a key/value pair. No ' exception is thrown if the wrong data type is supplied. Console.WriteLine(vbLf + "Remove(""dib"")") openWith.Remove("dib") If Not openWith.Contains("dib") Then Console.WriteLine("Key ""dib"" is not found.") End If End Sub End Class ' This code example produces the following output: ' 'An exception was caught for IDictionary.Add. Exception message: ' The value "42" is not of type "System.String" and cannot be used in this generic collection. 'Parameter name: key ' 'An element with Key = "txt" already exists. 'For key = "rtf", value = wordpad.exe. 'For key = "rtf", value = winword.exe. 'The default Item property returns Nothing if the key is of the wrong type: 'For key = 2, value = . 'A key of the wrong type was specified when setting the default Item property. 'For key = "tif", value = . 'Value added for key = "ht": hypertrm.exe 'openWith.Contains(29.7) returns False ' 'Key = bmp, Value = paint.exe 'Key = dib, Value = paint.exe 'Key = doc, Value = winword.exe 'Key = ht, Value = hypertrm.exe 'Key = rtf, Value = winword.exe 'Key = txt, Value = notepad.exe ' 'Value = paint.exe 'Value = paint.exe 'Value = winword.exe 'Value = hypertrm.exe 'Value = winword.exe 'Value = notepad.exe ' 'Key = bmp 'Key = dib 'Key = doc 'Key = ht 'Key = rtf 'Key = txt ' 'Remove("dib") 'Key "dib" is not found. '
using System; using System.Collections; using System.Collections.Generic; public class Example { public static void Main() { // Create a new sorted dictionary of strings, with string keys , // and access it using the IDictionary interface. // IDictionary openWith = new SortedDictionary<string, string>(); // Add some elements to the dictionary. There are no // duplicate keys, but some of the values are duplicates. // IDictionary.Add throws an exception if incorrect types // are supplied for key or value. openWith.Add("txt", "notepad.exe"); openWith.Add("bmp", "paint.exe"); openWith.Add("dib", "paint.exe"); openWith.Add("rtf", "wordpad.exe"); try { openWith.Add(42, new Example()); } catch (ArgumentException ex) { Console.WriteLine("An exception was caught for " + "IDictionary.Add. Exception message:\n\t{0}\n", ex.Message); } // The Add method throws an exception if the new key is // already in the dictionary. try { openWith.Add("txt", "winword.exe"); } catch (ArgumentException) { Console.WriteLine("An element with Key = \"txt\" already exists."); } // The Item property is another name for the indexer, so you // can omit its name when accessing elements. Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); // The indexer can be used to change the value associated // with a key. openWith["rtf"] = "winword.exe"; Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); // If a key does not exist, setting the indexer for that key // adds a new key/value pair. openWith["doc"] = "winword.exe"; // The indexer returns null if the key is of the wrong data // type. Console.WriteLine("The indexer returns null" + " if the key is of the wrong type:"); Console.WriteLine("For key = 2, value = {0}.", openWith[2]); // The indexer throws an exception when setting a value // if the key is of the wrong data type. try { openWith[2] = "This does not get added."; } catch (ArgumentException) { Console.WriteLine("A key of the wrong type was specified" + " when assigning to the indexer."); } // Unlike the default Item property on the Dictionary class // itself, IDictionary.Item does not throw an exception // if the requested key is not in the dictionary. Console.WriteLine("For key = \"tif\", value = {0}.", openWith["tif"]); // Contains can be used to test keys before inserting // them. if (!openWith.Contains("ht")) { openWith.Add("ht", "hypertrm.exe"); Console.WriteLine("Value added for key = \"ht\": {0}", openWith["ht"]); } // IDictionary.Contains returns false if the wrong data // type is supplied. Console.WriteLine("openWith.Contains(29.7) returns {0}", openWith.Contains(29.7)); // When you use foreach to enumerate dictionary elements // with the IDictionary interface, the elements are retrieved // as DictionaryEntry objects instead of KeyValuePair objects. Console.WriteLine(); foreach( DictionaryEntry de in openWith ) { Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value); } // To get the values alone, use the Values property. ICollection icoll = openWith.Values; // The elements of the collection are strongly typed // with the type that was specified for dictionary values, // even though the ICollection interface is not strongly // typed. Console.WriteLine(); foreach( string s in icoll ) { Console.WriteLine("Value = {0}", s); } // To get the keys alone, use the Keys property. icoll = openWith.Keys; // The elements of the collection are strongly typed // with the type that was specified for dictionary keys, // even though the ICollection interface is not strongly // typed. Console.WriteLine(); foreach( string s in icoll ) { Console.WriteLine("Key = {0}", s); } // Use the Remove method to remove a key/value pair. No // exception is thrown if the wrong data type is supplied. Console.WriteLine("\nRemove(\"dib\")"); openWith.Remove("dib"); if (!openWith.Contains("dib")) { Console.WriteLine("Key \"dib\" is not found."); } } } /* This code example produces the following output: An exception was caught for IDictionary.Add. Exception message: The value "42" is not of type "System.String" and cannot be used in this generic collection. Parameter name: key An element with Key = "txt" already exists. For key = "rtf", value = wordpad.exe. For key = "rtf", value = winword.exe. The indexer returns null if the key is of the wrong type: For key = 2, value = . A key of the wrong type was specified when assigning to the indexer. For key = "tif", value = . Value added for key = "ht": hypertrm.exe openWith.Contains(29.7) returns False Key = bmp, Value = paint.exe Key = dib, Value = paint.exe Key = doc, Value = winword.exe Key = ht, Value = hypertrm.exe Key = rtf, Value = winword.exe Key = txt, Value = notepad.exe Value = paint.exe Value = paint.exe Value = winword.exe Value = hypertrm.exe Value = winword.exe Value = notepad.exe Key = bmp Key = dib Key = doc Key = ht Key = rtf Key = txt Remove("dib") Key "dib" is not found. */

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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SortedDictionary ジェネリック クラス
SortedDictionary メンバ
System.Collections.Generic 名前空間
IDictionary.Item プロパティ
- SortedDictionary.System.Collections.IDictionary.Add メソッドのページへのリンク