Re: Forms Issue [modified] - C# Discussion Boards

Re: Forms Issue [modified]

14-Feb-08 23:43

Hi guys

[The senario]
i have a form (FrmUsers) that selects some columns from my userTable and then databinds it to a DataGridView on creation

when the user double clicks a row in the datagrid view an instance of (FrmAddUser) displays with the selected users details filled in

then when you close (FrmAddUser) after editing, the user the data is updated to my db

[the question]
how do i tell (FrmUsers)with the DataGridView that instantiated the AddUser Window that it has to redo the data binding as to reflect the changes?

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#14-Feb-08 23:57

14-Feb-08 23:57

Hello,

Tasks like this are mostely done with modal Windows called with ShowDialog().
The DialogResult of FrmAddUser tells FrmUsers if he has to Update his values.
The initialized Properties could be passed over the constructor from FrmAddUsers.
The return values could be passed over properties from FrmAddUsers.

pseudocode:

using(FormAddUser addUser = new FormAddUser(object initValues))
{
    if(addUser.ShowDialog() == DialogResult.OK)
    {
         object actUserInfos = addUser.ActUserInfos;
         ...
    }
}

You should also think of, if it makes sence to instanciate your FormAddUser always new.

All the best,

Martin

modified on Friday, February 15, 2008 6:29 AM

Re: Forms Issue

Harvey Saayman15-Feb-08 0:16

15-Feb-08 0:16

thanx martin!

never thaught of that... YOU ROCK as usual

Big Grin | :-D

TTYL

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Re: Forms Issue

Martin#15-Feb-08 0:35

15-Feb-08 0:35

Glad I could help!

All the best,

Martin

Dialog Issue

Harvey Saayman15-Feb-08 0:38

15-Feb-08 0:38

dude.. its not working

once the users details is updated i do (this.DialogResult = DialogResult.OK;) in(FrmAdduser)

and then in (FrmUsers) i hav this

<br />
FrmAddUser frmAddUser = new FrmAddUser(sqlConn);<br />
frmAddUser.MdiParent = this.MdiParent;<br />
frmAddUser.ShowDialog();<br />
<br />
if (frmAddUser.DialogResult == DialogResult.OK)<br />
{<br />
      dataBindDataGridView();;<br />
}<br />

but the if never returns true... any sugestions?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#15-Feb-08 0:46

15-Feb-08 0:46

Hello,

You have to set the property somehow yourselfe.

Normaly you have a Accept and an Cancel Button on your Form.
the Buttons have a Property called "DialogResult", which you have to set accordingly.

The Form has two properties called "AcceptButton" and "CancelButton", which you also have to set.

Look at the Doku [^] for more infos about that!

All the best,

Martin

Harvey Saayman15-Feb-08 0:52

15-Feb-08 0:52

but im i not setting the property when i do this.DialogResult = DialogResult.OK; in frmAddUser?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#15-Feb-08 0:55

15-Feb-08 0:55

HarveySaayman wrote:
but im i not setting the property when i do this.DialogResult = DialogResult.OK; in frmAddUser?

???
If you set the DialogResult property of frmAddUser like this, it should have this value when you close the Form.

All the best,

Martin

Harvey Saayman15-Feb-08 1:04

15-Feb-08 1:04

yes, when the user clicks the <update> button (which is a toolstrip button) my program updates the database and once that was successful i do this.DialogResult = DialogResult.OK;

and in FrmUsers i have..

<br />
            FrmAddUser frmAddUser = new FrmAddUser(sqlConn);<br />
            frmAddUser.MdiParent = this.MdiParent;<br />
            frmAddUser.ShowDialog();<br />
<br />
            if (frmAddUser.DialogResult == DialogResult.OK)<br />
            {<br />
                dataBindDataGridView();;<br />
            }<br />

but its not working...
i put a MessageBox inside the if to see if it goes in there but it doesnt...

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#15-Feb-08 1:09

15-Feb-08 1:09

Are you closing the Form frmAddUser over the 'X' of the Form?
This would set the property back to .Cancel!
You really should work with the Accept and CancelButtons properties like it was shown in the msdn example!

All the best,

Martin

Harvey Saayman15-Feb-08 1:11

15-Feb-08 1:11

nope, all the forms in my app has no controll box, therefor no X!
i am however closing using this.close();

i cant use normal buttons because of our standards, i must use a toolstrip button

thanx martin

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#15-Feb-08 1:26

15-Feb-08 1:26

Hmmmm,

~~You are not setting the property after calling Close(), are you?~~ OK, after your next post
Apart from that you should use Hide() instead of Close().
If you are using the using-block it's ok then, if not you have to call Dispose()!

All the best,

Martin

Harvey Saayman15-Feb-08 1:25

15-Feb-08 1:25

im so stupid! i had that code on the wrong event!

anyway... now im getting a "Form that is not a top-level form cannot be displayed as a modal dialog box. Remove the form from any parent form before calling showDialog." exception

im assuming its cuz frmAddUser has an MDI Parent. and it must be like that (standards once again). is there any way around that?

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Martin#15-Feb-08 1:33

Converting FontSize into float-value

15-Feb-08 1:33

HarveySaayman wrote:
is there any way around that?

Not that I know!

I think you would have to use Show() instead and handle the Closing[^] event of the frmAddUser then!

Nice WE!

All the best,

Martin

Brutus14-Feb-08 23:00

Brutus

14-Feb-08 23:00

I'm working with C# in ASP.NET on a custom control that converts strings into images (through httphandler) - that works fine, except for 'FontSize'. First I convert FontSize to a string parameter, but after that I can't find a way to convert it into a float-value (to build a Font). In httphandler:

<br />
    String sFontSize = context.Request.Params.Get("FontSize"); //= "120pt"<br />
    // 1<br />
    int iFontSize = Convert.ToInt32(sFontSize); //=0<br />
    // 2<br />
    float iFontSize = float.Parse(sFontSize); //=FormatException-Error<br />
    // 3<br />
    float iFontSize;<br />
    if (float.TryParse(sFontSize, out iFontSize)) //=false<br />
    // 4<br />
    FontUnitConverter fuc = new FontUnitConverter();<br />
    FontUnit fu= FontUnit.Parse(sFontSize);<br />
    float flt = (float)fuc.ConvertTo(fu, typeof(float)); //=Error<br />
<br />
    // float-value is needed to build font:<br />
    Font fFont = new Font(sFontName, iFontSize);<br />

Anyone any ideas?
Thanx, Brutus

Christian Graus14-Feb-08 23:16

Christian Graus

14-Feb-08 23:16

float.TryParse ? If the string is 120pt, you need to strip the 'pt' part first, or it just won't work.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Brutus14-Feb-08 23:45

Brutus

14-Feb-08 23:45

Yes, I could strip "pt" first, but the thing is that FontSize can be "Large", "Larger" etc. as well, so it's not always a "pt"-value. The size of the graphics-font I'm creating should correspond with the size of the original text-font, but the graphics-font is asking for a float value like this:

Font pFONT = new Font(sFontName, (float) iFontSize);
pGRAPH.DrawString("Text", pFONT, pBRUSH, 2, 2);

So, I'm looking for a way to somehow convert the original FontSize into a float-value.

Mircea Puiu15-Feb-08 0:23

Mircea Puiu

15-Feb-08 0:23

In that case, you are dealing with relative values for the font size.
Therefore, you may want to have a look at this MSDN example[^].

SkyWalker