Get index from a Dictionary

  • Thread starter Thread starter Luigi
  • Start date Start date
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Luigi

Hi all,
I have a Dictionary like this:

Dictionary<string, Object>

and I need to retrieve the index (0,1,2, etc) of a particular key (based on
dictionary insertion).

How can I accomplish this?

Thanks in advance.
 
I have a Dictionary like this:

Dictionary<string, Object>

and I need to retrieve the index (0,1,2, etc) of a particular key (based on
dictionary insertion).

How can I accomplish this?
Click to expand...

Dictionaries have no notion of insertion order - that information is
basically lost. If you need to maintain it, you'll need another data
structure (e.g. a list).

Jon
 
Jon Skeet said:
Dictionaries have no notion of insertion order - that information is
basically lost. If you need to maintain it, you'll need another data
structure (e.g. a list).
Click to expand...

Hi Jon,
and can I "pour" the keys collection of my Dictionary in a List, so I can
investigate the order of my strings?

Luigi
 
and can I "pour" the keys collection of my Dictionary in a List, so I can
investigate the order of my strings?
Click to expand...

No, you can inspect the order they were taken out of the dictionary and put
into the list. At best this will give you a current index; as soon as you
add a new value every index in the list could change, or non might.

What do you want to achieve?
 
Peter Morris said:
No, you can inspect the order they were taken out of the dictionary and put
into the list. At best this will give you a current index; as soon as you
add a new value every index in the list could change, or non might.

What do you want to achieve?
Click to expand...

My problem is that this dictionary serve a datasource of DevExpress
TreeList, and I have to write some tests that verify that the strings (the
keys in the dictionary) appear in a prestabilite order in that control (like
user preferences).

Luigi
 
Create a facade class that acts as the data source. Inside that class have
both a List and a Dictionary that you maintain. Use the dictionary for
quickly locating items based on their key, and the list for determining
items at a specific index.
 
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