Detailed introduction to C#'s method of closing a child window without releasing the child window object.

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During the debugging process of the online scanning camera, it is necessary to open a debugging interface to configure the position. After debugging, a common way is to save the debugging parameters and load them at the next startup. Another simple way is to run the program directly with this parameter. Therefore, in the latter case, the function that needs to be implemented is: even if the debugging window is closed, its window object is not released. The object of its debug window is not destroyed until its main window is closed.

1 Instantiate the sub-window in the main window

Instantiate the sub-window in the main window instead of instantiating the sub-window in the button window object.

Form2 f2 = new Form2();

2 Display the main window through buttons

What needs to be achieved in the button is the display of the window

private void Config_Click(object sender, EventArgs e)
    {
      f2.Show();
    }

3 Method to close the child window without releasing the child window object

After inquiry and verification, it is feasible to modify the Dispose method in the child window. Change as follows:

 protected override void Dispose(bool disposing)
    {
      Hide();
      //if (disposing && (components != null))
      //{
      //  components.Dispose();
      //}
      //base.Dispose(disposing);
    }

4 Destroy the child window object when the parent window is closed

Since the child window object needs to be destroyed when the parent window is closed, Therefore, add a call to the destruction function of the child window f2 in the closing action FormClosed of the parent window.

 private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
      f2.Close();
    }

The closing functions added in the sub-window class are as follows:

 public void Close()
    {

      this.Dispose();

    }

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