當前位置: 首頁>>代碼示例>>VB.NET>>正文


VB.NET ListDictionary類代碼示例

本文整理匯總了VB.NET中System.Collections.Specialized.ListDictionary的典型用法代碼示例。如果您正苦於以下問題:VB.NET ListDictionary類的具體用法?VB.NET ListDictionary怎麽用?VB.NET ListDictionary使用的例子?那麽, 這裏精選的類代碼示例或許可以為您提供幫助。


在下文中一共展示了ListDictionary類的2個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的VB.NET代碼示例。

示例1: Main

' 導入命名空間
Imports System.Collections
Imports System.Collections.Specialized

Public Class SamplesListDictionary   

   Public Shared Sub Main()

      ' Creates and initializes a new ListDictionary.
      Dim myCol As New ListDictionary()
      myCol.Add("Braeburn Apples", "1.49")
      myCol.Add("Fuji Apples", "1.29")
      myCol.Add("Gala Apples", "1.49")
      myCol.Add("Golden Delicious Apples", "1.29")
      myCol.Add("Granny Smith Apples", "0.89")
      myCol.Add("Red Delicious Apples", "0.99")

      ' Display the contents of the collection using For Each. This is the preferred method.
      Console.WriteLine("Displays the elements using For Each:")
      PrintKeysAndValues(myCol)

      ' Display the contents of the collection using the enumerator.
      Console.WriteLine("Displays the elements using the IDictionaryEnumerator:")
      PrintKeysAndValues2(myCol)

      ' Display the contents of the collection using the Keys, Values, Count, and Item properties.
      Console.WriteLine("Displays the elements using the Keys, Values, Count, and Item properties:")
      PrintKeysAndValues3(myCol)

      ' Copies the ListDictionary to an array with DictionaryEntry elements.
      Dim myArr(myCol.Count) As DictionaryEntry
      myCol.CopyTo(myArr, 0)

      ' Displays the values in the array.
      Console.WriteLine("Displays the elements in the array:")
      Console.WriteLine("   KEY                       VALUE")
      Dim i As Integer
      For i = 0 To myArr.Length - 1
         Console.WriteLine("   {0,-25} {1}", myArr(i).Key, myArr(i).Value)
      Next i
      Console.WriteLine()

      ' Searches for a key.
      If myCol.Contains("Kiwis") Then
         Console.WriteLine("The collection contains the key ""Kiwis"".")
      Else
         Console.WriteLine("The collection does not contain the key ""Kiwis"".")
      End If
      Console.WriteLine()

      ' Deletes a key.
      myCol.Remove("Plums")
      Console.WriteLine("The collection contains the following elements after removing ""Plums"":")
      PrintKeysAndValues(myCol)

      ' Clears the entire collection.
      myCol.Clear()
      Console.WriteLine("The collection contains the following elements after it is cleared:")
      PrintKeysAndValues(myCol)

   End Sub


   ' Uses the For Each statement which hides the complexity of the enumerator.
   ' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection.
   Public Shared Sub PrintKeysAndValues(myCol As IDictionary)

      Console.WriteLine("   KEY                       VALUE")
      Dim de As DictionaryEntry
      For Each de In  myCol
         Console.WriteLine("   {0,-25} {1}", de.Key, de.Value)
      Next de
      Console.WriteLine()

   End Sub


   ' Uses the enumerator. 
   ' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection.
   Public Shared Sub PrintKeysAndValues2(myCol As IDictionary)
      Dim myEnumerator As IDictionaryEnumerator = myCol.GetEnumerator()

      Console.WriteLine("   KEY                       VALUE")
      While myEnumerator.MoveNext()
         Console.WriteLine("   {0,-25} {1}", myEnumerator.Key, myEnumerator.Value)
      End While
      Console.WriteLine()

   End Sub


   ' Uses the Keys, Values, Count, and Item properties.
   Public Shared Sub PrintKeysAndValues3(myCol As ListDictionary)
      Dim myKeys(myCol.Count) As [String]
      myCol.Keys.CopyTo(myKeys, 0)

      Console.WriteLine("   INDEX KEY                       VALUE")
      Dim i As Integer
      For i = 0 To myCol.Count - 1
         Console.WriteLine("   {0,-5} {1,-25} {2}", i, myKeys(i), myCol(myKeys(i)))
      Next i
      Console.WriteLine()

   End Sub

End Class
開發者ID:VB.NET開發者,項目名稱:System.Collections.Specialized,代碼行數:106,代碼來源:ListDictionary

輸出:

Note that because a dictionary is implemented for fast keyed access the order
of the items in the dictionary are not gauranteed and, as a result, should not
be depended on.

Displays the elements using for each:
KEY                       VALUE
Braeburn Apples           1.49
Fuji Apples               1.29
Gala Apples               1.49
Golden Delicious Apples   1.29
Granny Smith Apples       0.89
Red Delicious Apples      0.99

Displays the elements using the IDictionaryEnumerator:
KEY                       VALUE
Braeburn Apples           1.49
Fuji Apples               1.29
Gala Apples               1.49
Golden Delicious Apples   1.29
Granny Smith Apples       0.89
Red Delicious Apples      0.99

Displays the elements using the Keys, Values, Count, and Item properties:
INDEX KEY                       VALUE
0     Braeburn Apples           1.49
1     Fuji Apples               1.29
2     Gala Apples               1.49
3     Golden Delicious Apples   1.29
4     Granny Smith Apples       0.89
5     Red Delicious Apples      0.99

Displays the elements in the array:
KEY                       VALUE
Braeburn Apples           1.49
Fuji Apples               1.29
Gala Apples               1.49
Golden Delicious Apples   1.29
Granny Smith Apples       0.89
Red Delicious Apples      0.99

The collection does not contain the key "Kiwis".

The collection contains the following elements after removing "Plums":
KEY                       VALUE
Braeburn Apples           1.49
Fuji Apples               1.29
Gala Apples               1.49
Golden Delicious Apples   1.29
Granny Smith Apples       0.89
Red Delicious Apples      0.99

The collection contains the following elements after it is cleared:
KEY                       VALUE

示例2:

For Each de As DictionaryEntry In myListDictionary
    '...
Next de
開發者ID:VB.NET開發者,項目名稱:System.Collections.Specialized,代碼行數:3,代碼來源:ListDictionary


注:本文中的System.Collections.Specialized.ListDictionary類示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台,相關代碼片段篩選自各路編程大神貢獻的開源項目,源碼版權歸原作者所有,傳播和使用請參考對應項目的License;未經允許,請勿轉載。