HI,
I’m learning C# and already know VB .Net. I noticed that C# you have a
Static Void Main () (entry point of the app).
Well that got me thinking, I was told that VB.net removed “The Black Box”
of software (hidden code). Where is my Shared sub Main ()? When I create a
blank app and run it, it asked me where is Shared sub Main. So, can I assume
that it’s hidden on a win32 app? And if so, why hide it?
Thanks
Jul 21 '05
20 3349
Does this show up in the code? I can't seem to find it. If I wanted to
write my own main to start the form, where would I put it? Just before the
class name?
"Philip Rieck" wrote: What cor states below isn't exactly correct, or at least, isn't worded exactly correct. Every .net application requires a managed entry point. (a "shared sub main")
However, in a windows form application the vb.net compiler will automatically create one for you if you chose a startup form. If you choose a form named "Form1", the code it creates is : <STAThread> _ Public Shared Sub Main() Application.Run (New Form1) End Sub
Note that this code is included in your application assembly, currently pushed into the "Form1" type. So it's as if you had typed that exact code above into your Form1 class and set Form1.Main as your startup method.
So no, it's not really hidden, it's just conveniently created for you if you don't write it yourself. I personally write it myself when creating VB.net winforms apps - it removes any ambiguity when looking at the code (you don't have to check the project properties to figure out where the app starts), and I can easily customize the startup code.
-Philip Rieck http://philiprieck.com/blog/
"Cor Ligthert" <no************ @planet.nl> wrote in message news:%2******** ********@TK2MSF TNGP10.phx.gbl. .. Hi Andre,
Sub Main is an standard part of dotNet.
When it is ommitted as with VBNet in the standard way than that one is taken in the Form you choose as startup in the properties of your application. It is not a win32 part.
It is not hidden, you just do not have to use it, however when you want, feel free to add that class a lot of VBNet programmers are using that as I have seen.
Cor
I'm learning C# and already know VB .Net. I noticed that C# you have a Static Void Main () (entry point of the app).
Well that got me thinking, I was told that VB.net removed "The Black Box" of software (hidden code). Where is my Shared sub Main ()? When I create a blank app and run it, it asked me where is Shared sub Main. So, can I assume that it's hidden on a win32 app? And if so, why hide it? Thanks
It doesn't show up in the code - it is injected at compile time, so it
*does* show up in the compiled IL.
If you wanted to do it yourself, you can
1) Create a module and add a "Sub Main" to it
2) Create a class file called something like "Startup.vb " and put this in
it:
Public Class Startup
<STAThread()> _
Public Shared Sub Main()
Application.Run (new Form1)
End Sub
End Class
3) put it in your existing Form1 class (inside the class)
....
Public Class Form1
Inherits System.Windows. Forms.Form
...
<STAThread()> _
Public Shared Sub Main()
Application.Run (new Form1)
End Sub
...
End Class
It doesn't really matter what class it's in, as it's a static (Shared)
method. All you need to do is make sure that it has access to the types and
members you want (Form1 is it in this case). I prefer putting it in a
Startup.cs in c#, or a module in vb.net, but I'm sure not everyone would
agree with me.
--
-Philip Rieck http://philiprieck.com/blog/
-
"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:2C******** *************** ***********@mic rosoft.com... Does this show up in the code? I can't seem to find it. If I wanted to write my own main to start the form, where would I put it? Just before the class name?
"Philip Rieck" wrote:
What cor states below isn't exactly correct, or at least, isn't worded exactly correct. Every .net application requires a managed entry point. (a "shared sub main")
However, in a windows form application the vb.net compiler will automatically create one for you if you chose a startup form. If you choose a form named "Form1", the code it creates is : <STAThread> _ Public Shared Sub Main() Application.Run (New Form1) End Sub
Note that this code is included in your application assembly, currently pushed into the "Form1" type. So it's as if you had typed that exact code above into your Form1 class and set Form1.Main as your startup method.
So no, it's not really hidden, it's just conveniently created for you if you don't write it yourself. I personally write it myself when creating VB.net winforms apps - it removes any ambiguity when looking at the code (you don't have to check the project properties to figure out where the app starts), and I can easily customize the startup code.
-Philip Rieck http://philiprieck.com/blog/
"Cor Ligthert" <no************ @planet.nl> wrote in message news:%2******** ********@TK2MSF TNGP10.phx.gbl. .. > Hi Andre, > > Sub Main is an standard part of dotNet. > > When it is ommitted as with VBNet in the standard way than that one is > taken in the Form you choose as startup in the properties of your > application. It is not a win32 part. > > It is not hidden, you just do not have to use it, however when you > want, > feel free to add that class a lot of VBNet programmers are using that > as I > have seen. > > Cor > >> I'm learning C# and already know VB .Net. I noticed that C# you have >> a >> Static Void Main () (entry point of the app). >> >> Well that got me thinking, I was told that VB.net removed "The Black >> Box" >> of software (hidden code). Where is my Shared sub Main ()? When I >> create >> a >> blank app and run it, it asked me where is Shared sub Main. So, can I >> assume >> that it's hidden on a win32 app? And if so, why hide it? >> >> >> >> Thanks >> > >
It doesn't show up in the code - it is injected at compile time, so it
*does* show up in the compiled IL.
If you wanted to do it yourself, you can
1) Create a module and add a "Sub Main" to it
2) Create a class file called something like "Startup.vb " and put this in
it:
Public Class Startup
<STAThread()> _
Public Shared Sub Main()
Application.Run (new Form1)
End Sub
End Class
3) put it in your existing Form1 class (inside the class)
....
Public Class Form1
Inherits System.Windows. Forms.Form
...
<STAThread()> _
Public Shared Sub Main()
Application.Run (new Form1)
End Sub
...
End Class
It doesn't really matter what class it's in, as it's a static (Shared)
method. All you need to do is make sure that it has access to the types and
members you want (Form1 is it in this case). I prefer putting it in a
Startup.cs in c#, or a module in vb.net, but I'm sure not everyone would
agree with me.
--
-Philip Rieck http://philiprieck.com/blog/
-
"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:2C******** *************** ***********@mic rosoft.com... Does this show up in the code? I can't seem to find it. If I wanted to write my own main to start the form, where would I put it? Just before the class name?
"Philip Rieck" wrote:
What cor states below isn't exactly correct, or at least, isn't worded exactly correct. Every .net application requires a managed entry point. (a "shared sub main")
However, in a windows form application the vb.net compiler will automatically create one for you if you chose a startup form. If you choose a form named "Form1", the code it creates is : <STAThread> _ Public Shared Sub Main() Application.Run (New Form1) End Sub
Note that this code is included in your application assembly, currently pushed into the "Form1" type. So it's as if you had typed that exact code above into your Form1 class and set Form1.Main as your startup method.
So no, it's not really hidden, it's just conveniently created for you if you don't write it yourself. I personally write it myself when creating VB.net winforms apps - it removes any ambiguity when looking at the code (you don't have to check the project properties to figure out where the app starts), and I can easily customize the startup code.
-Philip Rieck http://philiprieck.com/blog/
"Cor Ligthert" <no************ @planet.nl> wrote in message news:%2******** ********@TK2MSF TNGP10.phx.gbl. .. > Hi Andre, > > Sub Main is an standard part of dotNet. > > When it is ommitted as with VBNet in the standard way than that one is > taken in the Form you choose as startup in the properties of your > application. It is not a win32 part. > > It is not hidden, you just do not have to use it, however when you > want, > feel free to add that class a lot of VBNet programmers are using that > as I > have seen. > > Cor > >> I'm learning C# and already know VB .Net. I noticed that C# you have >> a >> Static Void Main () (entry point of the app). >> >> Well that got me thinking, I was told that VB.net removed "The Black >> Box" >> of software (hidden code). Where is my Shared sub Main ()? When I >> create >> a >> blank app and run it, it asked me where is Shared sub Main. So, can I >> assume >> that it's hidden on a win32 app? And if so, why hide it? >> >> >> >> Thanks >> > >
On Wed, 6 Oct 2004 10:50:11 -0500, Philip Rieck wrote: So no, it's not really hidden, it's just conveniently created for you if you don't write it yourself. I personally write it myself when creating VB.net
Since you cannot see it, then by definition, it is hidden. The OP was just
making the observation that VB.Net was supposed to have eliminated that
type of "Black Box" functionality. Yet it still exists.
--
Chris
dunawayc[AT]sbcglobal_lunch meat_[DOT]net
To send me an E-mail, remove the "[", "]", underscores ,lunchmeat, and
replace certain words in my E-Mail address.
Andre Thanks All, I wish VB.net was alittle more like C# where the code is there for you. Maybe have a check box to show or hide the code for those that don't want to see it.
In VBNet is as well all the code for you, the only thing is that there is in
this case used a feature of the .Net framework what is not done in C#.
In C# you cannot use it, in VBNet you are free to use it.
Cor
"Gerry O'Brien [MVP]" <gerry dot obrien at gmail dot com> schrieb: Just to add what Cor has posted, VB also has a weird quirk whereby if you create an app, then go into the code module for the Class Form1 and change the name to something other than Form1, you must then also go into the project properties and tell if to use the new class name for the form as the startup form. It assumes that it is still looking for Form1 and can no longer find that class.
If you do not do this, you will get the error that Sub Main cannot be found.
ACK, but VS.NET will kindly show a dialog that allows picking the new
startup object :-).
--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>
Thanks Philip for a VERY clear explaination.
"Philip Rieck" wrote: It doesn't show up in the code - it is injected at compile time, so it *does* show up in the compiled IL.
If you wanted to do it yourself, you can 1) Create a module and add a "Sub Main" to it
2) Create a class file called something like "Startup.vb " and put this in it: Public Class Startup <STAThread()> _ Public Shared Sub Main() Application.Run (new Form1) End Sub End Class
3) put it in your existing Form1 class (inside the class) .... Public Class Form1 Inherits System.Windows. Forms.Form
... <STAThread()> _ Public Shared Sub Main() Application.Run (new Form1) End Sub ... End Class It doesn't really matter what class it's in, as it's a static (Shared) method. All you need to do is make sure that it has access to the types and members you want (Form1 is it in this case). I prefer putting it in a Startup.cs in c#, or a module in vb.net, but I'm sure not everyone would agree with me.
-- -Philip Rieck http://philiprieck.com/blog/
- "Dennis" <De****@discuss ions.microsoft. com> wrote in message news:2C******** *************** ***********@mic rosoft.com... Does this show up in the code? I can't seem to find it. If I wanted to write my own main to start the form, where would I put it? Just before the class name?
"Philip Rieck" wrote:
What cor states below isn't exactly correct, or at least, isn't worded exactly correct. Every .net application requires a managed entry point. (a "shared sub main")
However, in a windows form application the vb.net compiler will automatically create one for you if you chose a startup form. If you choose a form named "Form1", the code it creates is : <STAThread> _ Public Shared Sub Main() Application.Run (New Form1) End Sub
Note that this code is included in your application assembly, currently pushed into the "Form1" type. So it's as if you had typed that exact code above into your Form1 class and set Form1.Main as your startup method.
So no, it's not really hidden, it's just conveniently created for you if you don't write it yourself. I personally write it myself when creating VB.net winforms apps - it removes any ambiguity when looking at the code (you don't have to check the project properties to figure out where the app starts), and I can easily customize the startup code.
-Philip Rieck http://philiprieck.com/blog/
"Cor Ligthert" <no************ @planet.nl> wrote in message news:%2******** ********@TK2MSF TNGP10.phx.gbl. .. > Hi Andre, > > Sub Main is an standard part of dotNet. > > When it is ommitted as with VBNet in the standard way than that one is > taken in the Form you choose as startup in the properties of your > application. It is not a win32 part. > > It is not hidden, you just do not have to use it, however when you > want, > feel free to add that class a lot of VBNet programmers are using that > as I > have seen. > > Cor > >> I'm learning C# and already know VB .Net. I noticed that C# you have >> a >> Static Void Main () (entry point of the app). >> >> Well that got me thinking, I was told that VB.net removed "The Black >> Box" >> of software (hidden code). Where is my Shared sub Main ()? When I >> create >> a >> blank app and run it, it asked me where is Shared sub Main. So, can I >> assume >> that it's hidden on a win32 app? And if so, why hide it? >> >> >> >> Thanks >> > >
Cor Ligthert <no************ @planet.nl> wrote: In VBNet is as well all the code for you, the only thing is that there is in this case used a feature of the .Net framework what is not done in C#.
In C# you cannot use it, in VBNet you are free to use it.
Which framework feature are you talking about, Cor? I'm not doubting
you - just trying to work out exactly what you mean.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Jon,
I have it from a book, which I have not in my possesion now.
I do not like to argue about it now, (not that I do not believe it is true,
however I am not completly sure on which level it is, build on top or build
as feature in some classes, I know that it works with WindowForms, Webforms,
Webservices and a self build Sub Main object so probably it is not a build
in feature in some classes however in a higher level).
I cannot find at the moment the same information I readed on MSDN.
However this will still cover in my opinion my last answer. http://msdn.microsoft.com/library/de...tdialogbox.asp
I hope this gives some idea's
Cor
"Jon Skeet [C# MVP]" <sk***@pobox.co m> Cor Ligthert <no************ @planet.nl> wrote: In VBNet is as well all the code for you, the only thing is that there is in this case used a feature of the .Net framework what is not done in C#.
In C# you cannot use it, in VBNet you are free to use it.
Which framework feature are you talking about, Cor? I'm not doubting you - just trying to work out exactly what you mean.
-- Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet If replying to the group, please do not mail me too
Cor Ligthert <no************ @planet.nl> wrote: I have it from a book, which I have not in my possesion now.
I do not like to argue about it now, (not that I do not believe it is true, however I am not completly sure on which level it is, build on top or build as feature in some classes, I know that it works with WindowForms, Webforms, Webservices and a self build Sub Main object so probably it is not a build in feature in some classes however in a higher level).
I cannot find at the moment the same information I readed on MSDN.
However this will still cover in my opinion my last answer.
http://msdn.microsoft.com/library/de...ary/en-us/vsin tro7/html/vxurfstartupobj ectdialogbox.as p
I hope this gives some idea's
If you're talking about VB.NET projects not needing to have an explicit
Main method in code, then I believe it's just the VB.NET compiler
putting one in for you if you tell it which type to use and if that
type inherits from Form.
Here's a nice small sample:
-------- Test.vb ----------
Option Strict On
Public Class Test
Inherits System.Windows. Forms.Form
End Class
---------------------------
Compile with:
vbc /r:System.dll,Sy stem.Windows.Fo rms.dll /main:Test Test.vb
Then look at the result - an exe with a perfectly normal Main method in
the Test type.
In other words, this isn't a framework feature which C# can't use, it's
a VB.NET compiler feature (and not one I personally like, but that's a
different matter).
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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Well that got me thinking, I was told that VB.net removed “The Black Box”
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