ASP Dictionary Object
The Dictionary object is used to store information in
name/value pairs (referred to as key and item)
Examples
Does a specified key exist?
This example demonstrates how to first create a Dictionary object, and then use
the Exists method to check if a specified key exists.
Return an array of all items
This example demonstrates how to use
the Items method to return an array of all the items.
Return an array of all keys
This example demonstrates how to use
the Keys method to return an array of all the keys.
Return the value of an item
This example demonstrates how to use
the Item property to return the value of an item.
Set a key
This example demonstrates how to use
the Key property to set a key in a Dictionary object.
Return the number of key/item pairs
This example demonstrates how to use
the Count property to return the number of key/item pairs.
The Dictionary Object
The Dictionary object is used to store information in name/value pairs
(referred to as key and item). The Dictionary object might seem similar to
Arrays, however, the Dictionary object is a more desirable solution to
manipulate related data.
Comparing Dictionaries and Arrays:
- Keys are used to identify the items in a Dictionary object
- You do not have to call ReDim to change the size of the Dictionary object
- When deleting an item from a Dictionary, the remaining items will
automatically shift up
- Dictionaries cannot be multidimensional, Arrays can
- Dictionaries have more built-in functions than Arrays
- Dictionaries work better than arrays on accessing random elements
frequently
- Dictionaries work better than arrays on locating items by their content
The following example creates a Dictionary object, adds some key/item
pairs to it, and retrieves the item value for the key gr:
<%
Dim d
Set d=Server.CreateObject("Scripting.Dictionary")
d.Add "re","Red"
d.Add "gr","Green"
d.Add "bl","Blue"
d.Add "pi","Pink"
Response.Write("The value of key gr is: " & d.Item("gr"))
%>
Output:
The value of key gr is: Green
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The Dictionary object's properties and methods are described below:
Properties
| Property |
Description |
| CompareMode |
Sets or returns the comparison mode for comparing keys in a Dictionary
object |
| Count |
Returns the number of key/item pairs in a Dictionary object |
| Item |
Sets or returns the value of an item in a Dictionary object |
| Key |
Sets a new key value for an existing key value in a
Dictionary object |
Methods
| Method |
Description |
| Add |
Adds a new key/item pair to a Dictionary object |
| Exists |
Returns a Boolean value that indicates whether a specified key exists in
the Dictionary object |
| Items |
Returns an array of all the items in a Dictionary
object |
| Keys |
Returns an array of all the keys in a Dictionary
object |
| Remove |
Removes one specified key/item pair from the Dictionary
object |
| RemoveAll |
Removes all the key/item pairs in the Dictionary object |
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