Re: VB6 - Property Let, Event and '\' - c# how? - C# Discussion Boards

First Prev Next

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 15:38

J. Dunlap

31-Jul-03 15:38

The C# way of doing it has many advantages, icluding:

* You can assign lots of different events to the same method.
* You can very easily hook and unhook events at runtime.
* The C# event implementation is much more flexible.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Anthony_Yio31-Jul-03 16:35

Anthony_Yio

31-Jul-03 16:35

VB is meant for RAD which mean they ignored details for you. Good for general purpose programming, bad for advanced.

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 8:39

J. Dunlap

31-Jul-03 8:39

As for question #2:
In C#, a property set is the same as a property let - and that's how things should be.
You cannot pass arguments to a property. You can, however, use indexers or a method.

And question #3:
Try casting the values to integers after performing division on them.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Chua Wen Ching31-Jul-03 15:22

Chua Wen Ching

31-Jul-03 15:22

For question 2, i got an error:

This is how i code:

public string SmallWindowPrompt(int SmallWindowNumber, string vData)
{
get
{
return this.SM[SmallWindowNumber];
}
set
{
SM[SmallWindowNumber] = vData;
}
}

When i compile, it says i need to place 2 semicolons right after get and set.

I just change the variable name, but it is based on question 2..

any help?

Thanks for everyone replies.

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 15:34

J. Dunlap

31-Jul-03 15:34

In C#, properties cannot have arguments. But why not just publicly expose whatever that SM collection is, and therefore eliminate the need for that property?

BTW, here's a tutorial[^] on properties in C#.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Chua Wen Ching31-Jul-03 23:47

Chua Wen Ching

31-Jul-03 23:47

Hi. My English not that good.. what you mean by:

why not just publicly expose whatever that SM collection is

???

Can show me an example?

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap1-Aug-03 9:00

J. Dunlap

1-Aug-03 9:00

Make a property for the SM collection.

public type SmallWindows
{
   get
   {
       return SM;
   }
}

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

sburton@amersham1-Aug-03 8:18

sburton@amersham

1-Aug-03 8:18

Another way: You can make this an overloaded method or create two properties.

// OVERLOADED METHODS
public string SmallWindowPrompt( int smallWindowNumber ) {

    return this.SM[sallWindowNumber];

}

public void SmallWindowPrompt( int smallWindowNumber, string vData ) {

    SM[smallWindowNumber] = vData;

}

// PROPERTIES
public string GetSmallWindowPrompt {
    get { return this.SM[SmallWindowNumber];}
}

public string SetSmallWindowPrompt {
    set{ this.SM[SmallWindowNumber] = value;}
}

Re: VB6 - Property Let, Event and '\' - c# how?

sburton@amersham31-Jul-03 9:41

sburton@amersham

31-Jul-03 9:41

Question #3

The dividion operator is overloaded to handle both integer and floating-point division.

Search for "Operators Compared in Different Languages" in the Help topics.

cast the results to integer.
float i = 1199282.293F;
float j = 199.33F;

newResult = (int)( i / j );

Using Custom .dll files - where do they go?

mikemilano31-Jul-03 7:07

mikemilano

31-Jul-03 7:07

I have created a .dll file to manage data with an sql server.

I want to build a new windows app that uses that .dll

2 Questions:
1. Where does the .dll file go? In the same directory as my project?

2. When I include the file, is it just like I define other classes?

Using namespace.class;

Re: Using Custom .dll files - where do they go?

Martin Cook31-Jul-03 7:21

Martin Cook

31-Jul-03 7:21

Assuming you are using Visual Studio.NET, open the solution explorer and right click on the "references" folder, select the "Add reference" menu choice, then click the browse button. Browse to your .DLL file, and click "OK". That will add a reference to your .DLL to the project. From there, just add a line at the top of your source file like this:

"using mynamespace;"

Martin Cook
Who needs cyberspace when you have CP space? Smile | :)

Re: Using Custom .dll files - where do they go?

mikemilano31-Jul-03 7:36

mikemilano

31-Jul-03 7:36

Thank you , .. as for .NET classes, they should automatically reference .. is this correct?

I had a problem where I created an app that would not run on another system which didn't have VS.NET installed.

It was an XP Pro box with .NET1.1 installed.

Re: Using Custom .dll files - where do they go?

Rein Hillmann31-Jul-03 22:20

Rein Hillmann

31-Jul-03 22:20

I had a problem where I created an app that would not run on another system which didn't have VS.NET installed.

As long as the target machine has the .NET framework installed, you should be good to go. Ensure that the framework version on the target machine is the same as the one you compiled your application to.

Hiding Form on Startup

Adam Durity31-Jul-03 5:40

Adam Durity

31-Jul-03 5:40

Hey,

How do you hide a form on startup so that it doesn't show at all. I want to hide a form initially until the user clicks on a notifyIcon. Currently...

public Form1()
{
	//
	// Required for Windows Form Designer support
	//
	InitializeComponent();
	this.Hide(); //or this.Visible = false;
}

...does not work. Any suggestions?

-- Adam

"If you can't beat your computer in chess, try kickboxing"

Re: Hiding Form on Startup

JM_FL31-Jul-03 6:27

JM_FL

31-Jul-03 6:27

Hey Adam,

try this, to prevent the form to be created at startup, if the no-button is clicked.

if (MessageBox.Show("Start Application",
"Question",
MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
{
Application.Run(new Form1());
}

Maybe it's helpful...

Jörg

Re: Hiding Form on Startup

Ista31-Jul-03 6:57

Ista

31-Jul-03 6:57

why not set a madule main function to be startup rather than a form. then you can do what you want with it

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: Hiding Form on Startup

Adam Durity31-Jul-03 8:35

Adam Durity

31-Jul-03 8:35

Okay,

I've got a semi working solution, tell me if i'm doing anything that could lead to problems later.

public class Class1
{
static void Main()
{
Form1 form = new Form1();
Application.Run();
}
}
 
public class Form1 : System.Windows.Form
{
public Form1()
{
IntiallizeComponent();
this.Visible = false;
}
}

This creates the notifyIcon in the system tray, but does not show the form. When the notifyIcon is double clicked, then the form pops up. When the form is disposed, i have it call Application.Exit() so that the Application quits properly...this is mostly what i'm concerned about, that the tread is terminating properly.

-- Adam

"If you can't beat your computer in chess, try kickboxing"

AutoScroll jumping to 0

S O S31-Jul-03 5:01

S O S

31-Jul-03 5:01

I have a window with AutoScroll set to true, but I seem to have some odd problem wtih it.
Whenever the window gets focus, the scrollbars jump to 0. How can I fix this?

Re: AutoScroll jumping to 0

misterbear31-Jul-03 22:59

misterbear

31-Jul-03 22:59

There is a property called AutoScrollPosition which contains the offset of the scrollwindow. I guess you have to manually account for this all the time...
But I really don't know cause I have the same problem.

If you find a good solution please let me know...

ListView and user click

aeros31-Jul-03 4:21

aeros

31-Jul-03 4:21

Hi guys !

Is there a way to know on which column of a ListView control the user has clicked ?
We can now the row but not the column.
Any idea ?

Thanks.

Re: ListView and user click

Rampas Tomas31-Jul-03 17:41

Rampas Tomas

31-Jul-03 17:41

aeros,
you can do it through OnMouseDown (or OnMouseUp). That events have MouseEventArgs parameters X, Y which you can use in ListView GetItemAt method. GetItemAt gives you the clicked ListViewItem. And thanks to Index property you can obtain the column.
Hope it helped.

Tomas Rampas
------------------------------
gedas CR s.r.o.
System analyst, MCP
TGM 840,
293 01 Mlada Boleslav,
Czech Republic
Telefon/phone +420(326)711411
Telefax/fax +420(326)711420
rampas@gedas.cz
http://www.gedas.com/
------------------------------

Re: ListView and user click

aeros31-Jul-03 22:44

aeros

31-Jul-03 22:44

Hi,

It doesn't work because ListViewItem.Index property gives you the row not the column.

--
Regards,
Julian.

Re: ListView and user click

Rampas Tomas1-Aug-03 3:31

Rampas Tomas

1-Aug-03 3:31

You are right. We have to help ourselves with interop:

class YourClassName<br />
{<br />
  const int LVM_FIRST  = 0x1000;<br />
  const int LVM_GETSUBITEMRECT = (LVM_FIRST + 56);<br />
  const int LVIR_BOUNDS = 0;<br />
  const int LVIR_ICON = 1;<br />
<br />
  [StructLayout(LayoutKind.Sequential)]<br />
  struct RECT<br />
  {<br />
    public int left;<br />
    public int top;<br />
    public int right;<br />
    public int bottom;<br />
  };<br />
  [DllImport("user32.dll")]<br />
  private static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, ref RECT lParam );<br />
  <br />
private void listView1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)<br />
{<br />
  RECT myrect;<br />
  ListViewItem lvitem = listView1.FocusedItem;<br />
  int wParam = lvitem.Index;<br />
  int intLVSubItemIndex;<br />
  ListViewItem.ListViewSubItem LVSubItem = null;<br />
  int intSendMessage;<br />
<br />
  for( intLVSubItemIndex = 1; intLVSubItemIndex < lvitem.SubItems.Count; intLVSubItemIndex++)<br />
  {<br />
    LVSubItem = lvitem.SubItems[intLVSubItemIndex];<br />
    myrect = new RECT();<br />
    myrect.top = intLVSubItemIndex;<br />
    myrect.left = LVIR_BOUNDS;<br />
    intSendMessage = SendMessage(listView1.Handle, LVM_GETSUBITEMRECT, wParam, ref myrect);<br />
    if( e.X < myrect.left)<br />
    {<br />
	LVSubItem = lvitem.SubItems[0];<br />
	intLVSubItemIndex = 0;<br />
	break;<br />
    }<br />
    else if(e.X >= myrect.left && e.X <= myrect.right)<br />
    {<br />
	break;<br />
    }<br />
    else<br />
	LVSubItem = null;<br />
  }<br />
<br />
  if (LVSubItem != null && lvitem != null)<br />
  {<br />
    MessageBox.Show(String.Format("ColumnIndex: {0} {1}", intLVSubItemIndex,<br />
			LVSubItem.Text));<br />
  }<br />
<br />
<br />
}<br />
}<br />

In the intLVSubItemIndex you have 0 base index of clicked column.

Tomas Rampas
------------------------------
gedas CR s.r.o.
System analyst, MCP
TGM 840,
293 01 Mlada Boleslav,
Czech Republic
Telefon/phone +420(326)711411
Telefax/fax +420(326)711420
rampas@gedas.cz
http://www.gedas.com/
------------------------------

To be or not to be is true...
George Bool

scaling text to fit into rectangle

misterbear31-Jul-03 4:13

misterbear

31-Jul-03 4:13

I have a little problem...

I have a panel with controls on it, that i want to draw to the printer. the controls consist of smaller panels with text inside them, and listboxes with lines of text inside as well.
(class diagram editor)

Now the problem is that when I print this i scale it to fit to A4 (or whatever specified) paper size. No problem scaling a simple bounding rectangle to the textboxes and listboxes, but now I want the text to be printed inside these components as well, so the print-out will appear as on screen. How can i fit the text into these boxes, i.e. apply a scaling to the bounding rectangle of the text?

I have thought of two things:
Either change font size until something that fits is found
OR
Draw the text to a bitmap and scale this.

Is there any 'standard' way of doing things like this? Any suggestions?

help!! about the ListView

vvvmmmvvv31-Jul-03 4:10

vvvmmmvvv

31-Jul-03 4:10

I want to change that ListView.ListViewItem's height.
HOW TO ?????
help!!!

Last Visit: 31-Dec-99 18:00 Last Update: 19-Apr-24 13:22

Refresh

ᐊ Prev 1...14600 14601 14602 146031460414605 14606 14607 14608 14609 Next ᐅ

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.