VB.net

suarve · 18 Jan 2007 at 22:44

Hi,

Just starting to have a mess about with vb.net. I need to assign the backcolour of a form (called this variable sColour) to a variable, so i can echo this in a message box E.g. "You are using Green as a backcolour". What type of variable would i set this as and how can i define sColour? Any ideas?

Thanks

Welshy · 18 Jan 2007 at 23:17

This should do it:

Code:

sColour As Color = SomeForm.BackColor

Where "SomeForm" is the name of the form whos background colour you want to get.

suarve · 18 Jan 2007 at 23:20

Welshy said:
This should do it:

Code:

sColour As Color = SomeForm.BackColor

Where "SomeForm" is the name of the form whos background colour you want to get.

I tried that first but i got a message says frmMain cannot relate to itself, use Me instead. So at the minute im using Me.Backcolour.....

suarve · 18 Jan 2007 at 23:31

suarve said:
I tried that first but i got a message says frmMain cannot relate to itself, use Me instead. So at the minute im using sColour = Me.Backcolour. Its weird cuz when i step through the code sColour has say Green stored for the colour of frmMain (e.g. whatever colour the form is), i'm still getting errors though ....

Welshy · 18 Jan 2007 at 23:35

Show us yer code

suarve · 18 Jan 2007 at 23:40

Welshy said:
Show us yer code

ok i have a form called frmMain that has a backcolor as red.

After a button has been clicked a message box should appear saying something like "Background colour is Red". For msg box the code is:

Code:

		Dim sColour As Color
		sColour = Me.BackColor

		'MessageBox.Show("Using the Scheme:  " & sColour)

Welshy · 18 Jan 2007 at 23:51

What errors are you getting?

suarve · 18 Jan 2007 at 23:57

Welshy said:
What errors are you getting?

Some errors about operators & not being defined. meh

~J~ · 19 Jan 2007 at 00:42

Might be getting the wrong end of the stick, but...

If you create a new button, and add the following to the click event, doesn't this do what you want?

Dim usrBGColor as Drawing.Color
usrBGColor=Me.BackColor
MsgBox(usrBGColor.ToString)

Or even...

Msgbox(me.Backcolor.tostring)

:confused:

Haircut · 19 Jan 2007 at 09:21

suarve said:
Some errors about operators & not being defined. meh

That's because you're trying to concatenate a string with a colour, doesn't really make a lot of sense, so they haven't defined the & operator to work in this context.

What you need is to get a string representation of the colour so you can concatenate the string together. As I'm sure you know all objects in .NET expose a ToString method so replace your last line with:

Code:

MessageBox.Show("Using the Scheme:  " & sColour.ToString())

suarve · 19 Jan 2007 at 12:24

Haircut said:
That's because you're trying to concatenate a string with a colour, doesn't really make a lot of sense, so they haven't defined the & operator to work in this context.

What you need is to get a string representation of the colour so you can concatenate the string together. As I'm sure you know all objects in .NET expose a ToString method so replace your last line with:

Code:

MessageBox.Show("Using the Scheme: " & sColour.ToString())

Thanks for replies everyone, got it working now. As i have literally only just started learning vb.net a week ago, can you explain the tostring() bit more?

Mr^B · 19 Jan 2007 at 12:43

suarve said:
Thanks for replies everyone, got it working now. As i have literally only just started learning vb.net a week ago, can you explain the tostring() bit more?

Think in terms objects and types.

You obviously can't do the following:

result = 5 + " peas"

That makes utterly no sense at all.

What makes more sense is:

result = "5" + " peas"

Which is the same as doing

result = 5.ToString() + " peas"

suarve · 23 Jan 2007 at 17:14

Right, time for more noob questions. I have the following:

Code:

MessageBox.Show("Hello " & txtName.Text & vbCrLf & "You Have Chosen the " & frmMain.BackColor.value "scheme")

the txtName.txt bit displays properly, but I cant get the background colour of the form (frmMain) to display. Any ideas?

Haircut · 23 Jan 2007 at 17:59

What are the error messages it gives?

From first glances, you have forgotten the concatenation operator before "scheme" and I don't think .value is a property of a colour?

Surely Visual Studio should tell you things like that at design time?

suarve · 23 Jan 2007 at 19:27

Haircut said:
What are the error messages it gives?

From first glances, you have forgotten the concatenation operator before "scheme" and I don't think .value is a property of a colour?

Surely Visual Studio should tell you things like that at design time?

When i run the program the second line doesn't display at all :/

The second line should read as follows:

you have chosen the [what color the form backcolor is] scheme

As fopr the .value im sure it was something along those lines.....have just come a bit stuck :/

Haircut · 23 Jan 2007 at 20:00

Well, what you have posted won't even compile so I fail to see how the first line displays :confused:

suarve · 23 Jan 2007 at 20:54

Haircut said:
Well, what you have posted won't even compile so I fail to see how the first line displays

txtName is just the txt from a text box and frmMain is a form with a backcolir set (need to output this colour on a message box).

suarve · 23 Jan 2007 at 22:19

Haha! Finally made it work.

Code:

MessageBox.Show("Hello " & txtName.Text & vbCrLf & _
			"You Have Chosen the " & Me.BackColor.Name & " Scheme", "Greetings", _
			MessageBoxButtons.OK, MessageBoxIcon.Asterisk)

TrUz · 24 Jan 2007 at 13:00

Just a quik tip. I would use the 'Me' keyword when reffering to controls as this will bring up intellisense and reduce spelling errors.

For example: Me.txtName.Text...

TrUz