vb.net How to check if a string contains one of the values of a key of Dictionary (or array)

Question

I need to check if a string contains one of the values (strings) of an Hashset

I was able to do it, but I've searched for a faster code. I found solutions only for c#, java, phyton but nothing for vb.net

This is a sample of the code I'm using:

    Dim mDict = New Dictionary(Of String, String)
    Dim ArrStr() As String = {"First:", "Second:", "Third:"}
    Dim StringA$ = "Second: It works!"

For Each k As String In ArrStr
    If StringA.Contains(k) Then
        mDict(k) = StringA
        Exit For
    End If
Next k

My question is: is there a way to avoid loop?

EDIT:

I want to thank you all for giving me suggestions and clarifications. I've understood that my question doesn't have answer and maybe it is a bad question.

I haven't got an answer but I've learned something ... Thanks again

If you found a C# solution that does what you want, it should be fairly trivial to translate it into VB.NET. — Cortright, May 22 '15 at 17:54
@Cortright I was not able to do that, I've tryed but... nothing — genespos, May 22 '15 at 17:57
@Cortright This is the link to the question: [link](http://stackoverflow.com/questions/3519539/how-to-check-if-a-string-contains-any-of-some-strings) — genespos, May 22 '15 at 18:01
What do you mean by "avoid loop"? Any solution will have to loop, in your code or in the api. — the_lotus, May 22 '15 at 18:03
@genespos - VB.NET translation of code in the link: `If (s.Contains("a") OrElse s.Contains("b") OrElse s.Contains("c")) Then` - but as others have pointed out, you'll still have loops. — Tim, May 22 '15 at 18:04
@the_lotus I've thought that an api would be faster, isn't it? — genespos, May 22 '15 at 18:07
Yeah - you might be able to avoid writing a loop in your own code, but it will still be looping in the API to do what you're asking. — Cortright, May 22 '15 at 18:14

score 4 · Answer 1 · answered May 22 '15 at 18:00

4

You could use LINQ, but it will still perform a loop internally:

mDict = ArrStr.Where(Function(x) StringA.Contains(x))
              .ToDictionary(Function(x) x, Function(x) StringA)

answered May 22 '15 at 18:00

MarcinJuraszek

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15
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I've never used linq. Do you think it will be faster? – genespos May 22 '15 at 18:05
1

No. It will take at least the same amount of time, most likely a bit more, because of delegate invocation and such, but it should be unnoticeable difference. – MarcinJuraszek May 22 '15 at 18:07

vb.net How to check if a string contains one of the values of a key of Dictionary (or array)

1 Answers1