Re: accessing objects in form by index or somthing like index - C# Discussion Boards

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 10:41

1-Jul-08 10:41

thank you but isn't the ImageSize of pictures limited (256 * 256)? what is the solution? how can i have something like ImageList but with much bigger size of image?

thanks again

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 10:47

User 6658

1-Jul-08 10:47

Do you need to display the images or just keep track of them inside a list?

If you need to display them, then you could add PictureBox controls dynamically to the form at runtime, something like

PictureBox pic = new PictureBox();
pic.Image = ...; // load your image instance from where ever you wish
Controls.Add(pic);

If you just need a list then this will do the trick:

List<Image> images = new List<Image>();
images.Add(...); // add images

regards

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 11:11

Sajjad Izadi

1-Jul-08 11:11

i can solve my problem now but it is not optimized though Big Grin | :-D

:

i named my pictureboxes as: picturebox1, picturebox2, ... and picturebox16. now i want them in a list. i wrote the followings:

PictureBox pic;
for (int i = 1; i < 16; i++)
{
    foreach (Control cont in this.Controls)
    {
         if (cont is PictureBox)
         {
               pic = cont as PictureBox;
               if (pic.Name.EndsWith(i.ToString()))
                      images.Add(pic);
         }
    }
}

it works

but do you suggest any thing more optimized? D'Oh! | :doh:

thanks

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 11:17

User 6658

1-Jul-08 11:17

Optimized? This is plain wrong Wink | ;)

Right now your code will be executed 16 * Controls.Length times.
The inner foreach loop will be executed for each i in the outer loop.
Better keep a counter in the foreach loop like this:

int picCounter = 1;
foreach (Control cont in this.Controls)
{
     if (cont is PictureBox)
     {
           pic = cont as PictureBox;
           if (pic.Name.EndsWith(picCounter.ToString()))
                  images.Add(pic);

           picCounter++;
     }
}

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 11:29

Sajjad Izadi

1-Jul-08 11:29

imagine the first control which is surveyed in foreach loop is picturebox16 (foreach is surveying the controls from picturebox16 to picturebox1 in order). then every time, the if condition fails. because picCounter is 1 and non of the name of picture boxes ends with "1" (11 is exception here). so only picturebox1 (last survey of foreach) is added to the List (because if condition does not fail). and after that, the foreach loop is finished (because there is no other control in foreach to survey) and only picturebox1 is added to the list.
so i think it is better to change the value of picCounter and then start foreach from the first. isn't it right? please guide me.
thanks

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 11:35

User 6658

1-Jul-08 11:35

Ah, I see.

Why do you actually need the pic.Name.EndsWith check?
For me it seems like you just want to store each PictureBox control into a list.
Or do you have more picture boxes that do not end with a number 1-16?

If this is the case, then I'd store the picture box number into the Tag property, so you only have to check this property if you want to add the PictureBox to the list.

regards

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 11:42

Sajjad Izadi

1-Jul-08 11:42

as you said, tag is more proper here.

isn't it any way more optimized than those tow loops? where they correct or not at last? how can i make it optimized (with consideration that i use tags instead of EndsWith)

thanks again

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 11:46

User 6658

1-Jul-08 11:46

I think the Tag solution with just the foreach loop is the correct way to do this.

As you said yourself, your solution will add some controls twice or some none at all (depending whether you continue out of the loop or not), because EndsWith("1") would trigger for both pictureBox1 and pictureBox11, depending on the order in which the picture boxes are returned in the foreach loop.

regards

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 11:53

Sajjad Izadi

1-Jul-08 11:53

except the Tag solution, do you offer anything else?

why just 'foreach'? you mean without the extern 'for'? i can't find out why. i wonder if you explain more about the reason of ommiting the extern 'for'.

thanks again and again Smile | :)

Re: accessing objects in form by index or somthing like index [MODIFIED!]

User 66581-Jul-08 12:03

User 6658

1-Jul-08 12:03

Sajjad Izadi wrote:
except the Tag solution, do you offer anything else?

I'd say it's the best solution for your problem.

Sajjad Izadi wrote:
why just 'foreach'? you mean without the extern 'for'? i can't find out why.

Because using the Tag, the foreach loop will already find all the controls you are looking for.

foreach (Control cont in this.Controls)
{
     if (cont is PictureBox)
     {
           pic = cont as PictureBox;
           if(pic != null)
           {
              string tag = pic.Tag as string;
      int number = int.Parse(tag); // this might fail, add a check here
      if (tag != null && number >= 1 && number <= 16)
         Console.WriteLine(number);
           }
     }
}

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 12:05

Sajjad Izadi

1-Jul-08 12:05

but i want the pictures in order of their position at form. does it response for the order?

and a non related question: what is that 'int?' ?

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 12:08

User 6658

1-Jul-08 12:08

It's a Nullable Type[^].

But I modified the sample a bit, because internally Control will cast the tag value to a string, so the int solution will not work here. See my modified post.

regards

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 12:11

Sajjad Izadi

1-Jul-08 12:11

what if i want the in order of their position in screen? should i ommit the outer 'for' still?

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 12:13

User 6658

1-Jul-08 12:13

Depends on how you define "position". The tag value, the (x,y) position, the order of how they were added to the form?

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 12:18

Sajjad Izadi

1-Jul-08 12:18

how is it if i want them in (x,y) position?
how is it if i want to add them in order of tag value? Smile | :)

and what if i want them in order of they were added to form? Big Grin | :-D

you will help me if multiple aspects if you answer these threes.

thanks in advanced Wink | ;)

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 12:20

User 6658

1-Jul-08 12:20

You need to figure these ones out by yourself now Poke tongue | ;-P

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 12:24

Sajjad Izadi

1-Jul-08 12:24

ok man ..., you're right Big Grin | :-D

: i have to write them myself.
thanks for your really hale answers Smile | :)

How to use DrawString to position text

shultas1-Jul-08 9:07

shultas

1-Jul-08 9:07

Hello-

I am currently using the Graphics.DrawString method to write text on the screen. I am using the StringFormatFlags.DirectionVertical in order to display a "banner" of text on the right hand side of the screen. The problem I am faced with is the text is in the opposite direction of what I am looking for. I am not really sure how to word this...

The way the string shows up now with the DirectionVertical flag is if you turned your head 90 degrees to the right, the text would be legible. If you turned your head 90 degrees to the left, the text would be upside down.

I am trying to use the DrawString method to make it so the text is in the opposite direction. If you turn your head 90 degrees to the LEFT, the text would be legible, 90 degrees to the RIGHT it would appear upside down.

I basically want to "flip" the text 180 degrees. My english is weak hopefully I explained properly.

Thank you so much in advance

Re: How to use DrawString to position text

Pete O'Hanlon1-Jul-08 9:48

Pete O'Hanlon

1-Jul-08 9:48

I suspect you can achieve this by using a RotateTransform.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: How to use DrawString to position text

luisnike191-Jul-08 9:56

luisnike19

1-Jul-08 9:56

try to use this...
save your drawing like an image and the apply the flip

image.RotateFlip(RotateFlipType.Rotate180FlipX);

change the RotateFlipType in order to solve exactly your problem.. Cool | :cool:

luisnike19

Font Format in DataGrid

cidmi.dovic1-Jul-08 8:40

cidmi.dovic

1-Jul-08 8:40

Hi,

I'm using .NET Framework 1.1.
I need to 'draw' a DataGrid with 4 columns but I need that diffenrent font sizes in every column.

I've tried using the DataGridTextBoxColumn TextBox.Font property but it doesn't work, the cell always take the size of the parent TableStyle.

Is this possible to configure different cells in a DataGrid.
Thanks.

Re: Font Format in DataGrid

Kjetil Svendsen1-Jul-08 9:38

Kjetil Svendsen

1-Jul-08 9:38