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Search Key in Dictionary

Posted on 2014-02-04
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Last Modified: 2014-02-05
Hi....

I would to check my Dictionary to see if the key contains a value so
so for example if i had a key in my dictionary that contains 12345 and i do this:

if Key contains "123" then

If Not dictionary.ContainsKey("12345") Then
           ' Update the key with new value
      end if      
endif
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Question by:runnerjp2005
8 Comments
 
LVL 40
ID: 39833156
There is a contradiction in your question.

if i had a key in my dictionary that contains 12345
If Not dictionary.ContainsKey("12345") Then

If your dictionnary has a key that contains 12345 as in the first line, the code line would be useless because it would never trigger.

?????

Try to explain your problem with other words and/or example
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LVL 19

Expert Comment

by:Rikin Shah
ID: 39833165
Hi,

dictionary("12345") = "something new"
0
 
LVL 23

Expert Comment

by:Christopher Kile
ID: 39833270
This code determines whether the key "12345" exists in the dictionary and, if not, gives it a value.
Dim dict as Dictionary(Of String, ValueType)
Dim newValue of New ValueType

If Not dict.ContainsKey("12345") then
    'first time key is given a value
    dict("12345") = newValue
End If

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Author Comment

by:runnerjp2005
ID: 39833751
Sorry I need to  check if value contains it so value could be 123749958 bit if I'm searching for 123 it would bring up result as 123749958 contains 123
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LVL 23

Expert Comment

by:Christopher Kile
ID: 39834068
runnerjp2005,

That's impossible because neither ContainsKey() nor ContainsValue() works that way.

If what you said was true, the following code would produce one or two message boxes when executed - on my system, this code produces no message boxes:

Imports System.Collections.Generic

Module Module1

    Sub Main()
        Dim x As New Dictionary(Of String, String)

        x.Add("12345", "12345")
        If x.ContainsKey("123") Then
            MsgBox("BAAAD!")
        End If
        If x.ContainsValue("123") Then
            MsgBox("VERY BAAAD!")
        End If
    End Sub

End Module

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This code is also an exact demonstration about how to determine whether a particular key or particular value exist within a Dictionary.
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LVL 23

Expert Comment

by:Christopher Kile
ID: 39834072
Wait a second...Is what you really want to know whether a value (or a key) BEGINNING WITH "123" exists in the Dictionary?
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Author Comment

by:runnerjp2005
ID: 39834096
Yes that's correct ...I'm checking if it begins with something as I would like to change it... What I'm doingg is storing teams and score so hull 1 - 0 man u... If man u score I want to check the dictionary for any thing with hull in it... If it matches current score in this case no as the score is 1-1 update the key to reflect score...if score remains the same leave it.
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LVL 83

Accepted Solution

by:
CodeCruiser earned 500 total points
ID: 39835612
Use the Where extension method on the dictionary with BeginsWith string function

http://msdn.microsoft.com/en-us/library/bb534803(v=vs.110).aspx
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