what is the correct form of string concatenation in VB.NET, + or &?
Both seem to work, but which is correct?
I know it's + in C# and & in VB6, but which in VB.NET?
23  6219 
Bonj, what is the correct form of string concatenation in VB.NET, + or &?
Both seem to work, but which is correct?
I know it's + in C# and & in VB6, but which in VB.NET?
The most correct is using stringbuilder
When you do not want that for whatever reason than the second correct is the
&
When you want to see a little sample of stringbuilder, reply that than?
I hope this helps?
Cor
> The most correct is using stringbuilder
Is it? Why do you say 'most' correct, surely either it's correct or it's not?
You saying that leads me to believe that you think that because
StringBuilder is fast at appending a lot of small strings to one big, I
notice it does have an append method.
When I said "what is correct", what I meant was, I thought that maybe it was
something like, MS had wanted everybody to use the +, but left & in for
backward compatibility reasons with VB6, or maybe only introduced + to be
similar to C# but really & was what they wanted you to use.
When you want to see a little sample of stringbuilder, reply that than?
Yes, go on then - if you've got one...
cheers
Bonj, When I said "what is correct", what I meant was, I thought that maybe it
was
something like, MS had wanted everybody to use the +, but left & in for
backward compatibility reasons with VB6, or maybe only introduced + to be
similar to C# but really & was what they wanted you to use.
No it is not backward compatible, in case of + or & is the last the most
correct for string concatination.
Try this with option Strict off
MessageBox.Show (1 & 2)
MessageBox.Show (1 + 2)
Both compiles and both shows an answer however those are different.
When the + is seen for concatination in this newsgroup, it mostly get a
message with the question why the + is used and that it has to be the &.
I had to answer that question about the stringbuilder as well because it is
even with small concatinations often much faster, but when it is one time in
a program, just use the &.
I hope that this answers your question?
Cor
You missed the boat a bit here Cor.
The OP was asking about concatenating strings, not conactenating numbers.
Your 2 examples will produce the correct results if the operands are
actually strings:
MessageBox.Show ("1" & "2")
MessageBox.Show ("1" + "2")
You have to remember that the StringBuilder class is a hybrid of the String
class with a lot more oomph for where it is needed or desired. It's use is
not mandatory.
As for the '+' operator for string concatenation, this is included for
backward compatability with the earliest dialects of BASIC where the only
string concatenation operator was '+'. The '&' string contenation operator
was introduced later so that confusion could be avoided, especially when
concatenating numbers that were coerced into strings.
The upshot is that the '&' string concatenation operator is the preferred
one.
"Cor Ligthert" <no************ @planet.nl> wrote in message
news:eA******** ******@TK2MSFTN GP15.phx.gbl... Bonj,
When I said "what is correct", what I meant was, I thought that maybe it
was
something like, MS had wanted everybody to use the +, but left & in for
backward compatibility reasons with VB6, or maybe only introduced + to be
similar to C# but really & was what they wanted you to use.
No it is not backward compatible, in case of + or & is the last the most
correct for string concatination.
Try this with option Strict off
MessageBox.Show (1 & 2)
MessageBox.Show (1 + 2)
Both compiles and both shows an answer however those are different.
When the + is seen for concatination in this newsgroup, it mostly get a
message with the question why the + is used and that it has to be the &.
I had to answer that question about the stringbuilder as well because it
is even with small concatinations often much faster, but when it is one
time in a program, just use the &.
I hope that this answers your question?
Cor
Stephany, You missed the boat a bit here Cor.
The OP was asking about concatenating strings, not conactenating numbers.
Your 2 examples will produce the correct results if the operands are
actually strings:
MessageBox.Show ("1" & "2")
MessageBox.Show ("1" + "2")
Those are correct as well with option string on.
MessagBox.Show( 1 & 2), when option strict is of, is this a string
concatination done by late binding.
The upshot is that the '&' string concatenation operator is the preferred
one.
My text "No it is not backward compatible, in case of + or & is the last the
most
correct for string concatination".
What is beside the words the difference?
And therefore what boat did I miss, you make me curious?
Cor
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote what is the correct form of string concatenation in VB.NET, + or &?
Both seem to work, but which is correct?
I know it's + in C# and & in VB6, but which in VB.NET?
A quick peek under the covers shows there is no difference in
which you use when the operands are both strings, but as was
the case in VB6, you should use & to remove any ambiguity as
to what operations will be performed.
All that is available in the help file. Highlight a + sign and hit F1.
LFS
Read this kids: http://msdn.microsoft.com/library/de...netchapt13.asp
Read the String Operations about 1/4 way down the page.
"Larry Serflaten" <se*******@usin ternet.com> wrote in message
news:OP******** ******@TK2MSFTN GP11.phx.gbl...
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote what is the correct form of string concatenation in VB.NET, + or &?
Both seem to work, but which is correct?
I know it's + in C# and & in VB6, but which in VB.NET?
A quick peek under the covers shows there is no difference in
which you use when the operands are both strings, but as was
the case in VB6, you should use & to remove any ambiguity as
to what operations will be performed.
All that is available in the help file. Highlight a + sign and hit F1.
LFS
Cor,
The issue is that 1 and 2 are numbers, not strings. Therefore, when you
call MessageBox(1 + 2), they are treated as numbers and return 3 (as an
integer). However, when you call MessageBox(1 & 2), the operands are
coerced into string representation and are properly concatenated (as
strings) to "12".
Your example shows precisely why the ampersand operator ("&") was
introduced: because the plus sign ("+") is ambiguous in its meaning outside
of a strictly mathematical interpretation. That's why Stephany said that
the ampersand is preferred.
Hope that helps?
Derrick
"Cor Ligthert" <no************ @planet.nl> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. .. Stephany,
You missed the boat a bit here Cor. The OP was asking about concatenating strings, not conactenating
numbers.
Your 2 examples will produce the correct results if the operands are
actually strings:
MessageBox.Show ("1" & "2")
MessageBox.Show ("1" + "2")
Those are correct as well with option string on.
MessagBox.Show( 1 & 2), when option strict is of, is this a string
concatination done by late binding.
The upshot is that the '&' string concatenation operator is the preferred
one.
My text "No it is not backward compatible, in case of + or & is the last
the most
correct for string concatination".
What is beside the words the difference?
And therefore what boat did I miss, you make me curious?
Cor
Bonj,
+ is also used to concatenate strings in VB6!
So which you use is really up to you, and what you are doing on that line.
I use & as it is the concatenation operator, while + is the addition
operator.
If you have Option Strict Off, the + may convert its arguments to or from
String first before performing the Addition.
StringBuilder has its place as does + and &. If I have a loop I will use a
StringBuilder, where as if I have a single line I will probably use &.
Of course if profiling proved that one was performing badly in a specific
routine, I would try the other to see if that improved performance.
I would not combine StringBuilder and & in a single line, such as
concatenating two strings to pass to StringBuilder.A ppend, as that is rarely
correct...
Hope this helps
Jay
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:8E******** *************** ***********@mic rosoft.com... The most correct is using stringbuilder
Is it? Why do you say 'most' correct, surely either it's correct or it's
not?
You saying that leads me to believe that you think that because
StringBuilder is fast at appending a lot of small strings to one big, I
notice it does have an append method.
When I said "what is correct", what I meant was, I thought that maybe it
was
something like, MS had wanted everybody to use the +, but left & in for
backward compatibility reasons with VB6, or maybe only introduced + to be
similar to C# but really & was what they wanted you to use.
When you want to see a little sample of stringbuilder, reply that than?
Yes, go on then - if you've got one...
cheers
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