Concat strings by and in VB Net

Question

Is there any difference between  amp  and   operators while concatenating string  if yes  then what is difference  And if No  then why below code generating exception   Example       Dim s  s1  t As String     Dim i As Integer      s1    Hello      i   1      s   s1  amp  i     t   s1   i    Exception here      If s   t Then         MessageBox Show  Equal          End If

User · Answer

amp  is only used for string concatenation     is overloaded to do both string concatenation and arithmetic addition    The double purpose of   leads to confusion  exactly like that in your question  Especially when Option Strict is Off  because the compiler will add implicit casts on your strings and integers to try to make sense of your code    My recommendations   You should definitely turn Option Strict On  then the compiler will force you to add explicit casts where it thinks they are necessary   You should avoid using   for concatenation because of the ambiguity with arithmetic addition     Both these recommendations are also in the Microsoft Press book Practical Guidelines And Best Practises for VB and C   sections 1 16  21 2

User · Answer

You ve probably got Option Strict turned on  which is a good thing   and the compiler is telling you that you can t add a string and an int  Try this   t   s1  amp  i ToString

User · Answer

From a former string concatenater  sp   you should really consider using String Format instead of concatenation       Dim s1 As String     Dim i As Integer     s1    Hello      i   1     String Format   0   1    s1  i    It makes things a lot easier to read and maintain and I believe makes your code look more professional  See  code better     use string format  Although not everyone agrees When is it better to use String Format vs string concatenation

User · Answer

As your question confirms  they are different   amp  is ONLY string concatenation    is overloaded with both normal addition and concatenation   In your example    because one of the operands to   is an integer VB attempts to convert the string to a integer  and as your string is not numeric it throws  and  amp  only works with strings so the integer is converted to a string

User · Answer

amp  and   are both concatenation operators but when you specify an integer while using    vb net tries to cast  Hello  into integer to do an addition  If you change  Hello  with  123   you will get the result 124

User · Answer

My 2 cents   If you are concatenating a significant amount of strings  you should be using the StringBuilder instead  IMO it s cleaner  and significantly faster

User · Answer

Try this  It almost seemed to simple to be right  Simply convert the Integer to a string  Then you can use the method below or concatenate   Dim I  J  K  L As Integer Dim K1  L1 As String  K1   K L1   L Cells 2  1    K1  amp    - uploaded  Cells 3  1    L1  amp    - expanded   MsgBox  records uploaded    amp  K  amp    records expanded    amp  L

User · Answer

You can write   amp   to add string and integer     processDetails objProcess ProcessId  amp       amp  objProcess name message   msgbox processDetails 16  Details     output will be   5577 wscript exe

[vb.net] Concat strings by & and + in VB.Net

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