Compare two string arrays with concat strings VB.NET

Question

In program is 2 structures with string fields. First Structure:

   Private Structure A
       Dim str1 as String 
       Dim str2 as String

Second Structure:

   Private Structure B
       Dim str1 as String

somewhere in code i assign it to array of

Dim a() as A
Dim b() as B

for Example in A we have name and surname in two string in B name and surname in one in result i need to compare composition of str1 and str2 of a() with str1 b(). in cpp this would be like

for(int i = 0; i < sizeA; i++)
{
   for(int j = 0; j < sizeB;i++)
   {
      if(!(strcmp(strcat(a[i].str1,a[i].str2),b[j].str1)) printf("GOOD!");
   }
}

And it wouldn't actually be that would it.. because strcmp has a return value that is actually useful. calling strcmp without checking its return value is rather pointless. — Sam Axe
– Sam Axe, Commented Jan 27, 2014 at 10:49
how to compare string in VB.net may be? I don't understand logic of VB at all) i wrote a question in result i need to compare composition of str1 and str2 of a() with str1 b(). — user2185412
– user2185412, Commented Jan 27, 2014 at 10:52
But how compare? you are comparing one A in A with all B in b, so do you want to find equals, or... — Konrad Kokosa
– Konrad Kokosa, Commented Jan 27, 2014 at 10:55

Tim Schmelter · Accepted Answer · 2014-01-27 10:59:46Z

2

I am not familiar with cpp, however, you can use LINQ:

Dim comparisons = From a1 In a
                  From b1 In b
                  Let a1Concat = a1.str1 & a1.str2
                  Let comp = String.Compare(a1Concat, b1.str1)
' you can enumerate the query with a For-Each ' 
For Each result In comparisons
    Dim a1Str1 As String = result.a1.str1
    Dim a1Str2 As String = result.a1.str2
    Dim a1Concat As String = result.a1Concat
    Dim b1Str1 As String = result.b1.str1
    Dim comparison As Int32 = result.comp
Next

answered Jan 27, 2014 at 10:59

Tim Schmelter

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3 Comments

user2185412 Over a year ago

o_O my mind is blown. o_O i'm trying to understand it)))

Tim Schmelter Over a year ago

You can use Where comp = 0 if you only want to take the "GOOD".

Steven Liekens Over a year ago

According to the guidelines, you shouldn't use Compare to check for equality.

Steven Liekens · Accepted Answer · 2014-01-27 11:53:06Z

1

This is your cpp code translated to VB, with some minor optimizations:

For i = 0 To (a.Length - 1)
    Dim strA = String.Join(" ", a(i).str1, a(i).str2)

    For j = 0 To (b.Length - 1)
        Dim strB = b(j).str1

        If String.Equals(strA, strB, StringComparison.Ordinal) Then
            Console.WriteLine("GOOD")
        End If

    Next
Next

edited Jan 27, 2014 at 11:53

answered Jan 27, 2014 at 11:02

Steven Liekens

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7 Comments

user2185412 Over a year ago

how to add a space beetween concat? String.Concat(a(i).str1 ,String.Concat(" ", a(i).str2)

Steven Liekens Over a year ago

Alternatively: Dim strA = a(i).str1 & " " & a(i).str2

user2185412 Over a year ago

better))) because in real i must concat 3 string and it was awful(but with spaces xD)

Steven Liekens Over a year ago

You can also use String.Join() if you need a space between every piece. See my updated answer.

user2185412 Over a year ago

found one mistake) if finded exit for to economy time)))

|

dovid · Accepted Answer · 2014-01-27 11:04:14Z

0

If (A.str1 + A.str2) = B.str1 Then Debug.Print("GOOD")

edited Jan 27, 2014 at 11:04

answered Jan 27, 2014 at 10:58

dovid

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