如何从集合中获取键和值 VB.Net [英] How to get the Key and Value from a Collection VB.Net

问题描述

在遍历 vb.net 集合时如何从它获取键值?

How do you get the key value from a vb.net collection when iterating through it?

    Dim sta As New Collection
    sta.Add("New York", "NY")
    sta.Add("Michigan", "MI")
    sta.Add("New Jersey", "NJ")
    sta.Add("Massachusetts", "MA")

    For i As Integer = 1 To sta.Count
        Debug.Print(sta(i)) 'Get value
        Debug.Print(sta(i).key) 'Get key ?
    Next

推荐答案

很确定你不能直接从 Microsoft.VisualBasic.Collection.

Pretty sure you can't from a straight Microsoft.VisualBasic.Collection.

对于上面的示例代码，请考虑使用 系统.Collections.Specialized.StringDictionary.如果这样做，请注意 Add 方法的参数与 VB 集合相反 - 先是键，然后是值.

For your example code above, consider using a System.Collections.Specialized.StringDictionary. If you do, be aware that the Add method has the parameters reversed from the VB collection - key first, then value.

Dim sta As New System.Collections.Specialized.StringDictionary
sta.Add("NY", "New York")
'...

For Each itemKey in sta.Keys
    Debug.Print(sta.Item(itemKey)) 'value
    Debug.Print(itemKey) 'key
Next

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