Are these 2 pieces of code the same?

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I make a lot of small programs in VB.Net. Of course, I have to declare variables. The way I declare "New" variables is

VB

Public House As Building = New Building("live")

Is that the same as this?

VB

Public House As New Building("live")

If not, what's faster, does it matter, what is safer?

Btw, I made the house idea while I was typing this.

Posted 22-Apr-12 13:21pm

jesusfan811

Updated 22-Apr-12 13:29pm

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Sergey Alexandrovich Kryukov 22-Apr-12 20:05pm

Not so interesting question. Why not simply using the disassembler to figure it out? It would be faster than asking this question and waiting for the answer.
--SA

VJ Reddy 22-Apr-12 20:11pm

Exactly. We thought same way.
I saw your comment after posting my answer.

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VJ Reddy · Accepted Answer · 2012-04-22T14:09:00

Solution 1

Let us see

VB

Sub Main
	Dim House As Building = New Building("live")
	Dim House2 As New Building("live")
End Sub

Public class Building
	Public sub New (Name as string)
		
	end sub
End class

The IL generated for the above code is

VB

IL_0001:  ldstr       "live"
IL_0006:  newobj      UserQuery+Building..ctor
IL_000B:  stloc.0
IL_000C:  ldstr       "live"
IL_0011:  newobj      UserQuery+Building..ctor
IL_0016:  stloc.1

Building..ctor:
IL_0000:  nop
IL_0001:  ldarg.0
IL_0002:  call        System.Object..ctor
IL_0007:  nop
IL_0008:  nop
IL_0009:  ret

From the above it is clear that the IL is same in both cases. Hence, there is no difference in declaring in either way.
I used Dim instead of public as public is not allowed inside a method.

Posted 22-Apr-12 14:09pm

VJ Reddy

Comments

Sergey Alexandrovich Kryukov 22-Apr-12 20:15pm

Thank you for taking the labor of running it. It was more or less apparent to me the two cases are the same, simply because I see no room for different IL. So, I answered, too, before I saw you answer -- please see.
Of course, my 5.
--SA

VJ Reddy 22-Apr-12 20:18pm

Thank you, SA.
I used LINQPad, which has a IL tab in the output pan to quickly see the IL. I too thought there will not be any difference between the statements, but if the IL is seen it would be more clear. Hence, posted IL from LINQPad.

Sergey Alexandrovich Kryukov 22-Apr-12 21:15pm

I appreciate the idea of LINQPad. As I almost never work with RDBMS, I never tried it. Do you mean using this the feature quoted below?
"Aside from being useful for writing queries, LINQPad can be used to interactively write C# code without having to compile it. This expands its use to a general "test workbench" where C# code can be quickly prototyped outside of Visual Studio."
Wikipedia,
http://en.wikipedia.org/wiki/LINQPad
Is it the same as "Code Scratchpad"?

What do you think about this tool? Is it non-obtrusive and light-weight? One concern is that it is proprietary software...
--SA

VJ Reddy 22-Apr-12 22:01pm

You are correct. LINQPad is useful as Code Scratchpad to test code snippets quickly. Even though, the LINQPad is not an open-source product as given at http://www.linqpad.net/#license, as per the license terms of the free version it can be useful for testing the code fragments.
In my experience, it is light-weight and non obtrusive.
Thank you.

Sergey Alexandrovich Kryukov 25-Apr-12 16:54pm

Thank you very much for answering.
--SA

parul77 22-Apr-12 23:37pm

my 5!

VJ Reddy 22-Apr-12 23:51pm

Thank you.

jesusfan811 25-Apr-12 19:40pm

Thanks for your answer. I didn't think that it would be the same, even though the 2 pieces of code are almost the same. I never knew that there was an disassembler (even though I don't explore the other features of visual Studio).

VJ Reddy 25-Apr-12 19:51pm

You're welcome and thank you for the response.

Sergey Alexandrovich Kryukov · Accepted Answer · 2012-04-22T14:12:00

I don't think there can be any difference, but I don't know what was to ask about. I never install support of VB.NET projects with Visual Studio and lazy enough to test it with always available compiler via a command line, otherwise I would simply compile both cases, run compiled code through the disassembler ILDASM.EXE into IL and compared the output. Why even asking things like that?

Please see:
http://msdn.microsoft.com/en-us/library/f7dy01k1%28v=vs.100%29.aspx[^].

—SA