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Excel VBA 编程基础 -- 结构化数据类型(八)- 字典

  • 2026-04-29 03:24:35
Excel VBA 编程基础 -- 结构化数据类型(八)- 字典
关于结构化数据类型,我们已经讨论过用户定义类型(UDT)、数组、集合,今天讨论最后一个——字典(dictionary)
与其他几种结构化数据类型不同,字典不是 VBA 内置的数据类型,使用字典类型必须添加对 Microsoft Scripting Runtime 的引用,如下图:
图1 引用 Microsoft Scripting Runtime
前面讨论过的集合只具有最基本的字典操作能力,Dictionary 则不同,这是一个全功能的字典类型。下面还是通过例子来具体感受 Dictionary 的能力。
例1. 字典的基本操作
Dim dict As New DictionaryDim v As Variantdict.Add "Name""Musk"dict("Job") = "Tesla CEO"If dict.Exists("Name") Then  Debug.Print "Hello, " & dict("Name")End Ifdict("Job") = dict("Job") & " & SpaceX CEO"dict.Key("Job") = "Title"Debug.Print dict("Name") & "'s titles are " & dict("Title")
所谓字典,就是一个由多个元素组成的集合(collection,这里说的集合是一个通用概念,不是 VBA 的集合数据类型,所以用小写的 collection 表示),每个元素都由键/值(Key/Item)对组成。所以,也可以这样认为,所谓字典就是一个由键到值的对照表(key-item mapping table)。
字典的重要意义就在于由键快速访问对应的值。当然,访问字典的前提是字典中含有要访问的内容。所以字典操作的首要任务是向字典中添加元素。
向字典中添加元素有两种方法:
  • Add 方法:dict.Add key, item
    • 如果 key 不存在,则添加 key/item 元素
    • 如果 key 已存在,则发生错误
  • 赋值方法:dict("key") = item
    • 如果 key 不存在,则添加 key/item 元素
    • 如果 Key 已存在,则将 key 的值更新为 item
访问字典元素的方法:
  • dict("key")
  • dict.Item("key")
    • 如果 key 不存在,则将 key/空值 加入字典,返回 key 对应的空值
    • 如果 key 已存在,则返回 key 对应的 item
更新字典元素的方法:
  • dict("key") = item
    • 如果 key 不存在,相当于添加元素 key/item
    • 如果 key 已存在,则将 key 的值更新为 item
Dictionary 的键也可以更新:
  • dict.Key("key") = newKey
    • 如果 key 不存在,则更新失败
    • 如果 key 已存在,但 newKey 也存在,则更新失败
    • 如果 Key 已存在,但 newKey 不存在,则 key 更新为 newKey
判断字典中键的存在性:
  • dict.Exists("key")
    • 如果 key 已存在,则返回 True
    • 如果 key 不存在,则返回 False
删除字典元素:
  • dict.Remove("key")
    • 如果 key 不存在,则发生错误
    • 如果 key 已存在,则删除 key/item 元素
  • dict.RemoveAll
    • 删除 dict 中所有元素
获取字典信息:
  • dict.Count:返回字典中元素数
  • dict.Keys:返回字典中所有 key 组成的数组
  • dict.Items:返回字典中所有 item 组成的数组
例2. 获取字典信息的等价方法
Dim dict As New DictionaryDim myA() As VariantDim i As IntegerDim v As Variantdict.Add("Name") = "Musk"dict("Title") = "Tesla CEO & SpaceX CEO"myA = dict.KeysFor i = 0 to dict.Count - 1  Debug.Print myA(i)Next iFor Each v indict.Keys  Debug.Print vNext vmyA = dict.ItemsFor i = 0 to dict.Count - 1  Debug.Print myA(i)Next iFor Each v indict.Items  Debug.Print vNext v
因为 Keys 和 Items 都是返回变体类型(Variant)的数组,所以枚举数组元素可以使用 For ... Next 循环,也可以使用 For Each ... Next 循环。一般来说使用 For Each ... Next 结构效率要高一点。
相关阅读
Excel VBA 编程基础 -- 结构化数据类型(六)- 集合(一)
Excel VBA 编程基础 -- 结构化数据类型(七)- 集合(二)

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  1. CONNECT:[ UseTime:0.000914s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000790s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000558s ]
  8. SELECT * FROM `article` WHERE `id` = 499697 LIMIT 1 [ RunTime:0.000765s ]
  9. UPDATE `article` SET `lasttime` = 1777927398 WHERE `id` = 499697 [ RunTime:0.001079s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000221s ]
  11. SELECT * FROM `article` WHERE `id` < 499697 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000476s ]
  12. SELECT * FROM `article` WHERE `id` > 499697 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000609s ]
  13. SELECT * FROM `article` WHERE `id` < 499697 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000771s ]
  14. SELECT * FROM `article` WHERE `id` < 499697 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000722s ]
  15. SELECT * FROM `article` WHERE `id` < 499697 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000850s ]
0.161979s