使用另一个类 c# 中的 PictureBox

Question

I hope my question will be clear

In Form1.cs i have PictureBox named: ico_ok

i would like to use this PictureBox in my new class that i bulit. when i start typing ico... nothing appears. what is the way to use this object in another class?

here the code:

public void button2_Click(object sender, EventArgs e)
    {
        lbl_check.Visible = true;
        btn_continue.Visible = false;
        txtbox_cusnumber.Enabled = false;
        string userID = (txtbox_cusnumber.Text.ToString());

        CheckOUinADexist checkou = new CheckOUinADexist(userID);
    }

after that look at the new class:

namespace ChekingOUinActiveDirectory

{

      class CheckOUinADexist
      {

              public CheckOUinADexist(string userID)
              {
              //this place i would like to use ico_ok
              }

 }

}

Thank you for helping. Maayan

Answer 1

The simplest approach is probably to provide that class with the dependency on the PictureBox :

public CheckOUinADexist(string userID, PictureBox pbox)
{
    pbox.[your code]
}

Then supply it when calling the method:

CheckOUinADexist checkou = new CheckOUinADexist(userID, ico_ok);

Whether or not this is the ideal approach depends on what you're going to be doing with that PictureBox inside that object, how portable that object needs to be across technology platforms, etc.

In general you don't want UI elements to permeate into non-UI logic. If CheckOUinADexist is a UI-bound class and exists solely to help the UI, then this isn't a problem. If it's part of business logic then you wouldn't want to couple that logic with the UI technology. Instead, you'd likely pass it the data needed from the PictureBox , but not the PictureBox itself.

This all depends a lot on the overall architecture of what you're trying to achieve here, which we don't know.

Answer 2

Basically you'd give the target class a reference to the "shared data" -- picture box in this case.

class CheckOUinADexist
{
    PictureBox _picBox
    public CheckOUinADexist(string userID, PictureBox picBox)
    {
        //this place i would like to use ico_ok
        _picBox = picBox;
        _picBox.myAction();
    }
}

Whether you want to actually stored Picturebox as a field (as opposed to just use a parameter) depends on whether you need access to the field throughout the lifetime of the instance(s) or whether it is just needed for object construction. If you are not sure, you are safer (IMHO) just storing a reference in a field. Make further uses of it a lot easier.