|
Thank-you for trying to help, but I am still confused....
Maybe here are some better examples of my dilema in undertanding where I can define an enum? I know I can make the example work by moving where the enum is defined, but I still do not understand why it needs to be moved. Why can't the enum constant be used just like a symbolic constant as my examples below demonstrate?
This does NOT work..... I would think it would, and still cannot understand why not.
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
enum temps
{
cold = 0,
fp = 32
}
System.Console.WriteLine("freezing is {0}", (int)temps.fp);
}
}
}
But the following does compile...
namespace ConsoleApplication2
{
class Program
{
enum temps
{
cold = 0,
fp = 32
}
static void Main(string[] args)
{
System.Console.WriteLine("freezing is {0}", (int)temps.fp);
}
}
}
And this works, if ditch the idea of using an enum, and use named constants
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
int cold = 0;
int fp = 32;
System.Console.WriteLine("freezing is {0}", cold);
}
}
}
|
|
|
|
|
Because the C# Language Specification says so. You can't do it because Enum's are an implementation of an abstract class (System.Enum), among other things. Since your really creating a concrete class by inheriting from System.Enum, you're bound by the rules of creating a new class. Classes can only be define at the Namespace and Class levels. You cannot define a class inside a method, so you can't define an Enum either.
Dave Kreskowiak
Microsoft MVP - Visual Basic
|
|
|
|
|
:-DAh makes sense now! Thank-you so much Dave and others too.
Just as a final blessing/followup. I thought I would try to show how classes cannot be defined within a method.
The example below does not compile - because you cannot define a class within a method ( you get the compile error: "} expected" on the line after the Main method) . And so the same problem would occur with the Enum - because you defining a class.
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
class temps
{
public int cold;
public int fp;
public temps()
{
cold = 0;
fp = 32;
}
}
temps xTemps = new temps();
System.Console.WriteLine("freezing is {0}", xTemps.fp);
}
}
}
If you move the definition of the class where it can legally be defined (in namespace or within another class - in this case I moved it to the namespace)... then all works well.
namespace ConsoleApplication2
{
class temps
{
public int cold;
public int fp;
public temps()
{
cold = 0;
fp = 32;
}
}
class Program
{
static void Main(string[] args)
{
temps xTemps = new temps();
System.Console.WriteLine("freezing is {0}", xTemps.fp);
}
}
}
|
|
|
|
|
How can u get sytem properties like used memory, avilable free memmory total memory, processer spec etc using C#.net
|
|
|
|
|
See the System.Management classes.
|
|
|
|
|
How can i create OCX files in C#.Net... I want to use a custom control and make an OCX file from it(instead of dll).. can i?
|
|
|
|
|
No. You can, however, add the necessary registration code to your control, and then register if as a COM control and use it like an OCX..(it will need a strong name and must be installed to GAC)
|
|
|
|
|
can u tell me how to create it using C#.net?
please provide some help if u have.
|
|
|
|
|
Any .Net DLL can be used as a COM object. There are a number of articles like this one[^] on Code project.
|
|
|
|
|
i was asking can we create .ocx file for usercontrol as we does in vb 6.0?
|
|
|
|
|
You can create a user control as a dll and use it in non-C# code. see the article I linked (it discusses using the result in VB6), and search for COM interop. OCX is just a file extension It's the registry entries that matter.
|
|
|
|
|
Right-click on your dll project in the Solution Explorer window within Visual Studio. Go to the "Build" tab. There is a checkbox on that page for "Register for COM Interop". Check that, and your .dll will automatically be registered for COM interop, meaning you could use it from COM.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: And in this corner, the Party of Allah
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
|
|
|
|
|
|
|
Hi
I wanna ask about "How Can I get Keyboard Layout?", It may be easy quesion but I stuck on it.
3doorsdown
Regards,
Hisham Galal <me4webby@yahoo.com>
|
|
|
|
|
|
Hi,
I ask about the current language of the keyboard
Regards,
Hisham Galal <me4webby@yahoo.com>
|
|
|
|
|
hello evrey one i put panel control on form and i want when mouse move on panel draw with mouse moving using GDi i do thing like (paint) in windows
|
|
|
|
|
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.DrawLine(Pens.Red, 0, 0, Width, Height);
}
|
|
|
|
|
Hi..
I have made a custom template that derives from ITemplate.
I have also create a class that inherits from INaming container.
For some reason i can not get the INaming container to work with my custom template. In order to implement the INaming container one must have a property that returns an ITemplate.
Why can i not return my custom Template the derives from ITemplate?
here is some of my code:
----
[ParseChildren(true)]
[PersistChildren(false)]
[ToolboxData("<{0}:HoverCalendar runat=server>")]
public class HoverCalendar : WebControl, INamingContainer
{
private ITemplate _itemTemplate;
[PersistenceMode(PersistenceMode.InnerProperty)]
public ITemplate ItemTemplate
{
get { return _itemTemplate; }
set { _itemTemplate = value; }
}
protected override void CreateChildControls()
{
Controls.Clear();
HtmlGenericControl container = new HtmlGenericControl("div");
if (ItemTemplate != null)
{ ItemTemplate.InstantiateIn(container); }
Controls.Add(container);
base.CreateChildControls();
}
}
*** this works fine; however, how do i use my ( the one below for example ) template?
----
public class myItemplate_1 : ITemplate
{
static int itemcount = 0;
ListItemType templateType;
public myItemplate_1(ListItemType type)
{
templateType = type;
}
public void InstantiateIn(System.Web.UI.Control container)
{
Literal lc = new Literal();
switch (templateType)
{
case ListItemType.Header:
lc.Text = "<TABLE border=1><TR><TH>Items</TH></TR>";
break;
case ListItemType.Item:
lc.Text = "<TR><TD>Item number: " + itemcount.ToString() +
"</TD></TR>";
break;
case ListItemType.AlternatingItem:
lc.Text = "<TR><TD bgcolor=lightblue>Item number: " +
itemcount.ToString() + "</TD></TR>";
break;
case ListItemType.Footer:
lc.Text = "</TABLE>";
break;
}
container.Controls.Add(lc);
itemcount += 1;
}
}
thanks
erik
|
|
|
|
|
I have a class which looks like that:
class Stuff
{
Dictionary<string, object> properties;
List<Stuff> children;
}
I'm writing a home made XML 'serialization'.
I quote that, because it's not serialization, I'm writing the XML writer myself (without System.Reflection).
I'm using a shema like that:
<stuff count=2 key1="value1" key2="value2" key3="value3">
<stuf>
.........
</stuff>
<stuf>
.........
</stuff>
</stuff>
where count = children.Count
and key1,2,3 are the keys in the properties dictionary and value1,2,3 their values.
properties is to be filled by the user with whatever (s)he wants.
Now my problem is:
==============
As the user could put whatever (s)he wants in the properties dictionary (s)he could as well create a key named 'count', therefore the 'count' atribute will be present twice in the tag.
It's not a problem for my reader (which expect a first count followed by any kind of attribute) but it might be for other people wanting to consume my XML documents.
What do you think?
it's actually much easier this way...
(particularly because this sample output is far from the whole story)
|
|
|
|
|
Super Lloyd wrote: What do you think?
Well, first of all, I think that the count attribute does not have a purpose. You should be able to just read the child nodes one at a time and add them to your list. Also, what is to say that the property key doesn't contain special characters or spaces?
It seems to me that you're limiting yourself by allowing the user to specify the attributes. If you add a section inside your root node called "properties" and use the <add key="..." value="..."/> format like Microsoft does, you enable yourself to write a concrete XML schema. This allows you to validate the XML against the schema first before trying to parse it, which is a good way to catch structure errors early without having to have all the validation code stuck in your deserialization code.
Logifusion[^]
If not entertaining, write your Congressman.
|
|
|
|
|
1. the count attribute has a performance 'raison d'etre'
there are few instance where it could be be big (over some thousands), if I don't specify I am going to run into many resize.
This is really annoying as I'm not using a List which double its internal capacity every time but (purposefully) an home made collection which grows its internal capaciy linearly, hence lots of resize/copy will happen.
2.
I thought of a format like
<tag>
<properties>
......
</properties>
<content>
......
</content>
</tag>
but it's going to completely blow up the size of my XML file (lots of tag here!), which annoys me...
whereas my format is 'compact'.
|
|
|
|
|
Hi i just want to know if it is possible to do the following in some way...
PrintPreviewDialog ppd = new PrintPreviewDialog();
ppd.Document = <Now here is what i want to know>
ppd.UseAntiAlias = true;
ppd.PrintPreviewControl.Zoom = 1.0;
ppd.WindowState = FormWindowState.Maximized;
ppd.ShowDialog(this);
Can you specify a specific file like: "C:\Test\invoice.html" in the "ppd.Document = " section?
"Many of life's failures are people who did not realize how close they were to success when they gave up." Thomas A. Edison
|
|
|
|
|
I have a var
List<object> firstList = new List<object>();
.. do some work ...
I have another list.
List<object> secondList = new List<object>();
what I want to do is add the second list to the First list.
firstList.AddRange(secondList);
Does anyone know how to accomplish this. Links or answers would be great.
Thanks,
Nick
-- modified at 10:09 Monday 14th August, 2006
--------------------------------------------------------
1 line of code equals many bugs. So don't write any!!
My mad coder blog
|
|
|
|