Question

My program class has:

Application.Run(new Form1());

in form1 class I have:

model = new Model(this);

    private void userEnteredText()
 {
       Model clonedModel = (Model)model.Clone();
       this.myButton.Size = new System.Drawing.Size(10,5);
       MessageBox.Show("buttons made small");
       this = clonedModel;
      MessageBox.Show("clone complete and buttons restored to orig size");
}

in model class I have:

    public Model(Form1 form1)
    {
        myform = form1;
    }

public object Clone()
{
   return new Model(myform);
}

My initial form1 object has the size of buttons really large. After the user enters a value in a textbox: I clone the model object and call a method that makes the buttons really small. How can I then set the model object to point back to the original model object with large buttons?

I’m getting this error:
“Cannot assign to this because it is read-only”

I know I can just change the button size but I need to clone the entire object because there are other original variables that I want reset.

Answer 1

One question – is it expected behaviour that whilst clone both models references the same Form? Clone() method just creates a new instance of Model but it still reference the same Form object,

You can persist state of the initial model in an other private field like

private Model backupModel;

and before applying a user-defined values just backup and later restore current model like:

 private void userEnteredText()
 {
       this.backupModel = model;     
       Model clonedModel = (Model)model.Clone();
       this.myButton.Size = new System.Drawing.Size(10,5);
       MessageBox.Show("buttons made small");
       model = this.backupModel;     
       MessageBox.Show("clone complete and buttons restored to orig size");
 }