閲覧総計：&counter(); （本日：&counter(today); 昨日：&counter(yesterday);)
配列変数の便利なハンドリング手法である「連想配列」。
ASP.NETでの「連想配列(Dictionary)」の使用方法を確認したのでメモしておく。 10/09/26
参考にしたページは↓こちら
「ハッシュテーブル(連想配列)を使うには？(Dictionaryクラス編)」 06/03/31
http://www.atmarkit.co.jp/fdotnet/dotnettips/429dictionary/dictionary.html
開発環境：VWD2008 VB
稼働環境：Win Server2003 .NET3.5
【稼働画面】
#ref(連想配列Dictionary画面.jpg);
【Dictionary.aspx】
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Dim dict As New Dictionary(Of String, String)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
'''''''''''''''''''''''''''''''''''''''
' 要素の追加その1
dict("japan") = "日本"
dict("america") = "アメリカ"
dict("2010/09/26") = "日替桜460円"
' 要素の追加その2
dict.Add("china", "中国")
dict.Add("india", "インド")
'''''''''''''''''''''''''''''''''''''''
' 値の取得その1
Dim val As String = dict("japan")
'Console.WriteLine(val) ' 出力：日本
Label1.Text = val ' 出力：日本
' Dim sss As String = dict("russia") ' 例外発生
' 値の取得その2
Dim value As String = ""
If dict.TryGetValue("america", value) Then
'Console.WriteLine(value) ' 出力：アメリカ
Label2.Text = value ' 出力：アメリカ
End If
'''''''''''''''''''''''''''''''''''''''
' キーと値の列挙
For Each key As String In dict.Keys
'Console.WriteLine("{0} : {1}", key, dict(key))
Label3.Text &= String.Format("{0} : {1}", key, dict(key)) & "<br />"
Next
' 出力例：
' japan : 日本
' america : アメリカ
' china : 中国
' india : インド
' 値の列挙
For Each v As String In dict.Values
'Console.WriteLine(v)
Label4.Text &= v & "<br />"
Next
' 出力例：
' 日本
' アメリカ
' 中国
' インド
'''''''''''''''''''''''''''''''''''''''
' キーの存在チェック
If Not dict.ContainsKey("france") Then
' 存在しない場合
dict("france") = "フランス" 'フランスを追加
End If
' 値の存在チェック
'Console.WriteLine(dict.ContainsValue("日本")) ' 出力：True
Label5.Text = dict.ContainsValue("日本")
'Label5.Text = dict.ContainsKey("2010/09/26")
'''''''''''''''''''''''''''''''''''''''
' 項目（キーと値）の列挙
For Each kvp As KeyValuePair(Of String, String) In dict
'Console.WriteLine("{0} : {1}", kvp.Key, kvp.Value)
Label6.Text &= String.Format("{0} : {1}", kvp.Key, kvp.Value) & "<br />"
Next
' 出力例：
' japan : 日本
' america : アメリカ
' china : 中国
' india : インド
' france : フランス
'''''''''''''''''''''''''''''''''''''''
' ソート済みのディクショナリの利用
Dim sdict As New SortedDictionary(Of String, String)(dict)
For Each kvp As KeyValuePair(Of String, String) In sdict
'Console.WriteLine("{0} : {1}", kvp.Key, kvp.Value)
Label7.Text &= String.Format("{0} : {1}", kvp.Key, kvp.Value) & "<br />"
Next
' 出力例：
' america : アメリカ
' china : 中国
' france : フランス
' india : インド
' japan : 日本
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
連想配列(Dictionary)の使用法の確認 10/09/26<br />
<br />
<b>値の取得その1</b><br />
<asp:Label ID="Label1" runat="server"></asp:Label>
<br />
<br />
<b>値の取得その2</b><br />
<asp:Label ID="Label2" runat="server"></asp:Label>
<br />
<br />
<b>キーの列挙</b><br />
<asp:Label ID="Label3" runat="server"></asp:Label>
<br />
<br />
<b>値の列挙</b><br />
<asp:Label ID="Label4" runat="server"></asp:Label>
<br />
<br />
<b>値の存在チェック</b><br />
<asp:Label ID="Label5" runat="server"></asp:Label>
<br />
<br />
<b>項目(キーと値)の列挙</b><br />
<asp:Label ID="Label6" runat="server"></asp:Label>
<br />
<br />
<b>ソート済みのディクショナリの利用</b><br />
<asp:Label ID="Label7" runat="server"></asp:Label>
<br />
</div>
</form>
</body>
</html>
【参考にしたページ】
「ハッシュテーブル(連想配列)を使うには？(Dictionaryクラス編)」 06/03/31
http://www.atmarkit.co.jp/fdotnet/dotnettips/429dictionary/dictionary.html
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