C#-APP: Accessing controls on form from an outside Class

[Masterfrier]

Hello Experts! ;-)

I am fairly new to C#, and have this problem....

on my form, i have some controls (imagelist, etc..)

from another class, i need to access imageList1

Here is a snippet of the class

        public System.Windows.Forms.Button AddNewButton(int Top, int Left, int Width, int Height)
        {
            // Create a new instance of the Button class.
            System.Windows.Forms.Button aButton = new System.Windows.Forms.Button();
            // Add the button to the collection's internal list.
            this.List.Add(aButton);
            // Add the button to the controls collection of the form 
            // referenced by the HostForm field.
            HostForm.Controls.Add(aButton);
            // Set intial properties for the button object.
            aButton.Top = Top;// Count * 25;
            aButton.Left = Left;// 100;
            aButton.Height = Height;
            aButton.Width = Width;
            aButton.Tag = this.Count;
            aButton.Text = ButtonProperties[this.Count].Text ;
            if (ButtonProperties[this.Count].Lock == true) aButton.BackColor = System.Drawing.Color.Red;
            if (ButtonProperties[this.Count].Lock == true) aButton.BackgroundImage  = imageList1.Images[0];
            aButton.Click += new System.EventHandler(ClickHandler);
 
 
            return aButton;
        }
 

The problem is in line 18

Any help would be appreciated.

[shweta123]

Hi,

You should create the instance of the form and then call its controls using it.
e.g. objform.ImageList1

[Masterfrier]

Hi,
and thanks for thew quick reply..

Isn't it what i'm already doing in line 11.

If it's not, could you be so kind to be a little more specific.

        static void Main(string[] args) 
        {
            if (args.Length == 0)
            {
                Application.Exit();
 
            }
            else
            {
                //szMachineName = args[0];
                Application.Run(new Form1(args[0]));
            }
 
        }
 
        private void Form1_Load(object sender, System.EventArgs e)
        {
            Init_APP();
            bDone = true;
        }
 

[shweta123]

Hi,

Please see here, this code had you posted in your last thread

public System.Windows.Forms.Button AddNewButton(int Top, int Left, int Width, int Height)
{
// Create a new instance of the Button class.
System.Windows.Forms.Button aButton = new System.Windows.Forms.Button();
// Add the button to the collection's internal list.
this.List.Add(aButton);
// Add the button to the controls collection of the form
// referenced by the HostForm field.
HostForm.Controls.Add(aButton);
// Set intial properties for the button object.
aButton.Top = Top;// Count * 25;
aButton.Left = Left;// 100;
aButton.Height = Height;
aButton.Width = Width;
aButton.Tag = this.Count;
aButton.Text = ButtonProperties[this.Count].Text ;
if (ButtonProperties[this.Count].Lock == true) aButton.BackColor = System.Drawing.Color.Red;
if (ButtonProperties[this.Count].Lock == true) aButton.BackgroundImage = imageList1.Images[0];
aButton.Click += new System.EventHandler(ClickHandler);


return aButton;
}



I could not see here anything like Application.Run(new Form1(args[0]));
Where are you stuck exactly?

Hi,
and thanks for thew quick reply..

Isn't it what i'm already doing in line 11.

If it's not, could you be so kind to be a little more specific.

        static void Main(string[] args) 
        {
            if (args.Length == 0)
            {
                Application.Exit();
 
            }
            else
            {
                //szMachineName = args[0];
                Application.Run(new Form1(args[0]));
            }
 
        }
 
        private void Form1_Load(object sender, System.EventArgs e)
        {
            Init_APP();
            bDone = true;
        }
 

[Masterfrier]

Hi,

Ok, sorry

My project consist of:

Form1.cs, where all is done, this is where the previous listed code is from, it is here e.g. imageList1 resides

Then i have 3 classes/files:
CIniFile.cs
CLogbook.cs
CStatButton.cs

The first listed code where the problem is, is a method in Class CStatButton
From this Class, i want to be able to access the control imageList1 from Form1.

So the problem is in line 18 from the first post.

Hopes this make more sense...

[Masterfrier]

Anyone able to help??

[Plater]

you could pass the reference to your image list into the constructor of your other classes, and have it retain a reference to it:

public class myclass
{
   private imagelist savethis=null;
   public myclass(Imagelist savethis)
   {
      _myimagelist=savethis;
   }
}
 

But I would more recomend that if you must, pass the object into the function calls and have it used there.

[RoninZA]

Hi Masterfrier...

I would change your addNewButton method to return an ImageList index, for example:

public System.Windows.Forms.Button AddNewButton(int Top, int Left, int Width, int Height, out int imageListIndex)
{
.
.
//set imageListIndex to the index of the image in the ImageList you 
//want to assign to the button
imageListIndex = 0;
.
.
}
 

Which you will call as follows:

.
.
int imageListIndex = -1;
System.Windows.Forms.Button newButton = <className>.AddNewButton(0, 0, 36, 80, out imageListIndex);
newButton.BackgroundImage = imageList1.Images[imageListIndex];
this.Controls.Add(newButton);
.
.
 

Basically moving the code to assign the image and add the button to the form out of your class and into the calling form.

Hope it helps! :)

[Masterfrier]

Hi.

Thanks Plater & RoninZA, as you mentioned Plater, i implemented it as RoninZA suggested.

It now operates perfectly.