Making Definitions

  • Thread starter Thread starter Devon-S
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Devon-S

Greetings,

I am trying to make a definition like FormView.Insert. I have figured out
how to make an eNum, but they seem to be attached to a subclass in VS2005.

I have a class that displays three images of three size and I am hoping to
make an ImageSize.Small, ImageSize.Medium, ImageSize.Right.

I tried making a class with static members but the result was not the same
Internal List.

Anyhelp would be appreciated.

Devon
 
I am trying to make a definition like FormView.Insert. I have figured out
how to make an eNum, but they seem to be attached to a subclass in
VS2005.
Click to expand...

What do you mean, "attached to a subclass"?
I have a class that displays three images of three size and I am hoping
to
make an ImageSize.Small, ImageSize.Medium, ImageSize.Right.
Click to expand...

You may find this page, documenting the "enum" keyword in C#, useful for
your cause:
http://msdn2.microsoft.com/en-us/library/sbbt4032.aspx

If after reading the documentation and following its example you have some
specific questions, please feel free to post those specific questions here.

Pete
 
Pete,

I wasn't asking how enum works it doesn't produce the result I wanted.

I wondered what kind of thing is FormView.Insert. It is not an enum as both
items are colored Cyan and it appears like a proper type.

Do you know how to created a FormView.Insert type thing?


Devon
 
Devon-S said:
I wasn't asking how enum works it doesn't produce the result I wanted.
Click to expand...

Well, you previously said that enums "seem to be attached to a subclass
in VS2005" which suggests that you don't understand them. That in turn
means that it's possible that they *could* produce the result you want,
if you understood them better...
I wondered what kind of thing is FormView.Insert. It is not an enum as both
items are colored Cyan and it appears like a proper type.

Do you know how to created a FormView.Insert type thing?
Click to expand...

I can't see FormView.Insert at all. (I can see FormView.InsertItem, but
that's just a method.) What exact member are you talking about? Do you
have an MSDN link for it?
 
John,

There is a great chance that I don't truely understand the enum. But since
the only examples at the link work exactly as I said in a class, sending me
back to how I didn't want them to work wasn't helpful to my lack of
understanding.

But back to the problem...

There is a (something could be a type or a class) called FormViewMode. When
you want to change the mode of the form you do.

FormView1.ChangeMode(FormViewMode.Insert)

The great thing about the FormViewMode is it appears as a type so you can
make it a property of another class

public partial class ImageStore

protected FormViewMode _fvmCurrentMode;

public FormViewMode CurrentMode
{
get { return _fvmCurrentMode ; }
set { _fvmCurrentMode = value ; }
}

}

I would like to create a (whatever form view mode is) for ImageSize and have
three properties. Small Medium Large. I know I can do it sorta with an eNum.
But when I went to use it to access it, I had to do <Class>.EnumType.Property

With ImageSize it is actually going to be in lots of different places like
FormViewMode.

Appreciating the C# enlightenment...

devon
 
Devon-S said:
There is a great chance that I don't truely understand the enum. But since
the only examples at the link work exactly as I said in a class, sending me
back to how I didn't want them to work wasn't helpful to my lack of
understanding.
Click to expand...

Peter didn't send you *back* to them - he sent you *to* them. You gave
no indication that you'd already looked at that page.

Furthermore, although the Days example is indeed a nested type (not a
subclass, by the way), the CarOptions one isn't.
But back to the problem...

There is a (something could be a type or a class) called FormViewMode. When
you want to change the mode of the form you do.

FormView1.ChangeMode(FormViewMode.Insert)
Click to expand...

Ah, FormViewMode. Not FormView, which is a class. Yes, FormViewMode is
an enum, and Insert is a member of that enum.

I would like to create a (whatever form view mode is) for ImageSize and have
three properties. Small Medium Large. I know I can do it sorta with an eNum.
But when I went to use it to access it, I had to do <Class>.EnumType.Property
Click to expand...

Only if you make it a nested type.
With ImageSize it is actually going to be in lots of different places like
FormViewMode.

Appreciating the C# enlightenment...
Click to expand...

Just declare the enum outside any other type.
 
Jon,

Thanks, I do appreciate the help. This nearly has it for me, but I don't see
how I use the declaration in other assemblies then. I know I should go back
and read a c# manual, but most of the time I get it (at least somewhat).

The ImageDisplaySize is used in a WebControl and in the top of the file that
declares the web control, I put

public enum ImageDisplaySize { Small, Medium, Large }

I would expect to be able to use it where I had dragged the WebUC onto the
page. But it doesnt appear when I go to set the property type.

I am sure this is very easy on the "Easy Button" scale. Appreciate the help.


regards:jamie
 
Jon,


Thanks, I do appreciate the help. This nearly has it for me, but I don't
see
how I use the declaration in other assemblies then. I know I should go
back
and read a c# manual, but most of the time I get it (at least somewhat).
Click to expand...

Yes, but when you don't "get it", reading the documentation is a great
place to start.

That said, you use your enum from other assemblies the same way you'd use
any type in that assembly from another assembly. An enum is just another
type. If you have learned how to use in some assembly any type you've
declared in another assembly, then you already know how to do the same
with an enum.

If you don't know that, then your question isn't really about enums per se.

Pete
 
Peter,

I agree I am not getting it, because normally when I want to use a WEb
Control in another assembly, I just drag in the webcontrol and it is
registered, and you can use the things in that assembly. But the enum values
don't appear.

When i put it inside the class it works, when it is not in the class it does
not work.

Maybe my question isn't about enums maybe it is about how some parts of some
namespaces are automatically registered when other parts are not.

But if I knew what my question was about I would not have been so vague.
This is my very first time ever using an enum.

This is my very first time in 2 years of C# where the value I was trying to
pass was a tri-state and not just a bool or a string. So today is the day I
have to figure it out.

Any help would be appreciated. Once I read through the manual on types,
enums, static declarations, I decided I didn't know which is commonly used
and decided to ask for help.

Devon
 
Devon-S said:
Thanks, I do appreciate the help. This nearly has it for me, but I don't see
how I use the declaration in other assemblies then. I know I should go back
and read a c# manual, but most of the time I get it (at least somewhat).
Click to expand...

Well, I'd certainly recommend learning C# "properly" rather just taking
a sort of "hit and hope" approach. It may work for a while, but sooner
or later you're bound to run up against problems due to a lack of
knowledge of the theory behind it all.
The ImageDisplaySize is used in a WebControl and in the top of the file that
declares the web control, I put

public enum ImageDisplaySize { Small, Medium, Large }

I would expect to be able to use it where I had dragged the WebUC onto the
page. But it doesnt appear when I go to set the property type.

I am sure this is very easy on the "Easy Button" scale. Appreciate
the help.
Click to expand...

When you saying you're trying to set the property type, do you mean
you're trying to set the property *value* in the designer, or you're
trying to set the property *type* in the web control class itself?

If you're in code, but in a different class, do you have the
appropriate "using" directive for the namespace containing the enum?
 
Well, I'd certainly recommend learning C# "properly" rather just taking
a sort of "hit and hope" approach. It may work for a while, but sooner
or later you're bound to run up against problems due to a lack of
knowledge of the theory behind it all.
Click to expand...

I am not really sure the best way to achieve that result. Their are no MS C#
classes withing 1000 miles of where I live, and most of the practical on-line
stuff is sometimes good and bad. Since C# is about my 10th language
(Assembler, Basic, Fortran, dbase, clipper, FoxPro, delphi, c, c++,
LotusScript), to learn it is sometimes the nuances that I don't get at first,
but as I use them, I study them.

And when I don't understand I post a question.
When you saying you're trying to set the property type, do you mean
you're trying to set the property *value* in the designer, or you're
trying to set the property *type* in the web control class itself?
Click to expand...

Point 2 the property type in the web control class itself.
If you're in code, but in a different class, do you have the
appropriate "using" directive for the namespace containing the enum?
Click to expand...

This is a part I know I am a bit weak on, as it is now outside the class in
the same file that in the .ascx file is register
src="../WebUCs/<thefile.ascx>.

Normally this lets me see the properties and methods in the file via the
WebControl ID. But it doesn't see the enum unless I put it back in the class.

And do try and get the tone of my posting, I do appreciate your help,

Devon
 
Devon-S said:
I am not really sure the best way to achieve that result. Their are no MS C#
classes withing 1000 miles of where I live, and most of the practical on-line
stuff is sometimes good and bad. Since C# is about my 10th language
(Assembler, Basic, Fortran, dbase, clipper, FoxPro, delphi, c, c++,
LotusScript), to learn it is sometimes the nuances that I don't get at first,
but as I use them, I study them.

And when I don't understand I post a question.
Click to expand...

I woud suggest getting a book. Now of course *which* book is the next
question... I rather like Essential C# by Mark Michaelis. Others will
no doubt have other recommendations.
Point 2 the property type in the web control class itself.
Click to expand...

You should just be able to declare it to be the appropriate type:

public ImageDisplaySize DisplaySize
{
get { ... }
set { ... }
}
This is a part I know I am a bit weak on, as it is now outside the class in
the same file that in the .ascx file is register
src="../WebUCs/<thefile.ascx>.
Click to expand...

I would strongly advise putting it in its own file, which should make
it obvious which namespace it's in.
Normally this lets me see the properties and methods in the file via the
WebControl ID. But it doesn't see the enum unless I put it back in the class.
Click to expand...

I'm a bit lost as to what exactly you're describing at this point.

Here's an idea: put the web control itself to one side for a minute,
and write a completely separate test app, just for the sake of
understanding a bit more about enums. Create another enum, and a class
that uses it for a property; then create an instance of that class from
yet *another* class, and set the property. Something like:

ImageDisplaySize.cs: enum (no reason to change it to a different name
really)

FakeWebControl.cs: not a real web control, just an ordinary class with
a property of type ImageDisplaySize

Program.cs: Entry point which creates an instance of FakeWebControl and
sets its property
 
Devon-S wrote:
This is a part I know I am a bit weak on, as it is now outside the class in
the same file that in the .ascx file is register
src="../WebUCs/<thefile.ascx>.

Normally this lets me see the properties and methods in the file via the
WebControl ID. But it doesn't see the enum unless I put it back in the class.

And do try and get the tone of my posting, I do appreciate your help,

Devon
Click to expand...
Have a read about the App_Code folder in ASP.NET. You will need to put
your enum there if you want to share it throughout the application.
 
Jon,
I woud suggest getting a book. Now of course *which* book is the next
question... I rather like Essential C# by Mark Michaelis. Others will
no doubt have other recommendations.
Click to expand...

Great Idea. I will try this one, as I have gone through a couple that were
really, how to use DataGrid with about 5 pages on C#. I used to work with a
Mark Michaelis I wonder if it is the same one.
I would strongly advise putting it in its own file, which should make
it obvious which namespace it's in.
Click to expand...

Great Idea, going to do just that... Thanks for they great amount of help.

The problem must be me and the namespace.

Many thanks for all of your help;

Devon
 
I agree I am not getting it, because normally when I want to use a WEb
Control in another assembly, I just drag in the webcontrol and it is
registered, and you can use the things in that assembly. But the enum
values
don't appear.
Click to expand...

Well, when you "drag in the webcontrol" (from where do you drag it?),
obviously something happens that allows the class defining the web control
to be used. The class is a type, just like an enum is a type.

So even if the Designer is doing something automatic, you should be able
to look at the source code it generates that allows you to use the web
control type, and replicate that so that you can use the enum type. If
the two types are declared in the same source file and namespace, I would
expect the enum to practically "just work", but if not, it can't be that
hard.

Unfortunately, I don't have any direct experience with the web control
part of .NET. Your question has a straightforward answer for a regular C#
application, but if you get HTML and a web server involved, it goes
outside my realm of experience. I suspect the answer is as
straightforward as it is for a regular C# application, but I can't tell
you for sure.
When i put it inside the class it works, when it is not in the class it
does
not work.

Maybe my question isn't about enums maybe it is about how some parts of
some
namespaces are automatically registered when other parts are not.
Click to expand...

Maybe. But I doubt it. That's certainly not an issue with respect to
non-web applications. If you have access to anything declared in a given
assembly under a given namespace, you have access to everything in that
assembly under that namespace. You don't get "parts" of a namespace if
all the parts are in the same assembly.

I think that the advice Jon's offered is useful. Another thing you might
do is actually create two different projects in two different solutions,
one in which you declare the enum, and another in which you use it. The
first project will be built as a library, and the second as an
application. It complicates things a little, but it has the advantage of
clearly showing the relationship between a namespace, an assembly in which
things in that namespace are defined, and a different assembly that uses
the first one.

If the example Jon suggest clears things up, great. If not, consider
breaking it apart a little more as I describe above.

Finally, if none of that works, you may simply want to post a
concise-but-complete example of code that reliably demonstrates what
you're trying to do. Since it's apparently a web-based project, you may
want to provide a little extra detail about how the code is actually
used. For someone who already knows about using the web controls stuff,
that shouldn't be necessary, but if your question is really about C#,
posting a web control-based example without some information as to how to
use it will unnecessarily restrict the people who might otherwise be able
to answer the question (excluding, for example, me :) ).

Pete
 
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