DictionaryEntry来循环访问Hashtable对象的实例

最新推荐文章于 2022-10-16 10:51:22 发布

bigheadsheep

最新推荐文章于 2022-10-16 10:51:22 发布

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分类专栏： vb.net 文章标签： rtf each basic output module table

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本文通过一个简单示例展示了如何使用DictionaryEntry结构遍历并访问Hashtable中的元素。示例使用Visual Basic编写，创建了一个包含几种文件扩展名及其关联程序的Hashtable，并通过ForEach循环输出了这些键值对。

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下面的示例演示如何使用 DictionaryEntry 来循环访问 Hashtable 对象。

Visual Basic

'A simple example for the DictionaryEntry structure.
Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Module Example

    Sub Main()

        ' Create a new hash table.
        '
        Dim openWith As New Hashtable()

        ' Add some elements to the hash table. There are no 
        ' duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

        ' When you use For Each to enumerate hash table elements,
        ' the elements are retrieved as KeyValuePair objects.
        Console.WriteLine()
        For Each de As DictionaryEntry In openWith
            Console.WriteLine("Key = {0}, Value = {1}", _
                de.Key, de.Value)
        Next de

    End Sub

End Module

' This code example produces output similar to the following:
'
'Key = rtf, Value = winword.exe
'Key = txt, Value = notepad.exe
'Key = dib, Value = paint.exe
'Key = bmp, Value = paint.exe