【VB】C#との差異　(ジェネリック、List、Dictionary 編)

VB.NET

■ 使用上の注意

Dictionary

 * 以下の関連記事を参照のこと。
http://blogs.yahoo.co.jp/dk521123/21978660.html

■ 宣言 / New

List

Dim list = New List(Of String)

Dictionary

Dim words As New Dictionary(Of String, String)

■ 初期化 / 値の取得

List

Dim list As New List(Of String)) (New String() {
    "associate", 
    "concerns"
})

' From キーワードを使って、コレクション用に初期化する
Dim values As New List From {
  New SampleClass With {.Id = "X001", .Name = "Mike"},
  New SampleClass With {.Id = "X002", .Name = "Tom"}
}

' 値の取得
Dim value = values(0)

参考文献

http://d.hatena.ne.jp/PoohKid/20071211/map
http://vbegg.webcrow.jp/windowsforms/initialize.html

Dictionary

* .NET Framework 4.0以降らしい 
Dim words = New Dictionary(Of String, String)() From _
{
    {"associate", "関係づける，連想する."},
    {"concerns", "興味，関心"}
}

' 値の取得
Dim word = words("concerns")

参考文献

http://d.hatena.ne.jp/qaz76/20110222/1299167727
http://www.atmarkit.co.jp/fdotnet/chushin/vb2010features_01/vb2010features_01_03.html

■ ループ

List

Dim values As New List(Of String)) (New String() {
    "associate", 
    "concerns"
})

For Each value As String In values
    ' ループ処理
Next

参考文献

http://homepage1.nifty.com/rucio/main/VBdotNet/Samples201/Sample205ForEachNext.htm

Dictionary

Dim words = New Dictionary(Of String, String)() From _
{
    {"associate", "関係づける，連想する."},
    {"concerns", "興味，関心"}
}

For Each word As KeyValuePair(Of String, String) In words
  Console.WriteLine("{0} : {1}", word.Key, word.Value)
Next

参考文献

http://www.atmarkit.co.jp/fdotnet/dotnettips/429dictionary/dictionary.html


■ ソート

Dictionary

// キーでソート
For Each word As KeyValuePair(Of String, String) In words.OrderBy(Function(val) val.Key)
// 値でソート
For Each word As KeyValuePair(Of String, String) In words.OrderBy(Function(val) val.Value)

// キーでソート
For Each word As KeyValuePair(Of String, String) In words.OrderByDescending(Function(val) val.Key)
// 値でソート
For Each word As KeyValuePair(Of String, String) In words.OrderByDescending(Function(val) val.Value)

参考文献

http://smdn.jp/programming/netfx/sorting/0_basictypes/#Enumerable.OrderByDescending

関連記事

【C#】【コレクション】Dictionary (ディクショナリ)

http://blogs.yahoo.co.jp/dk521123/21978660.html