Calling a method on another form in C#

Question

I am building a basic Image editor. In my app, if the user wants to resize the image a new form pops up and asks the user to input an new width and height for the image.

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Answer 1

Setup properties in your "resize" class for the values you want to retrieve. For example, if you add a width property:

public int Width { get; set; }

you will be able to get the width from your Form1 class.

Answer 2

I assume there are a number of ways to do this. I'd probably use public properties on the resizeForm and then get those when the resizeForm.ShowDialog() returns.

if (resizeForm.ShowDialog() == DialogResult.OK) // or whatever
{
   myVal = resizeForm.Val;
   ...
}

or something like that.

Answer 3

Add properties to your resize form that your main form can interrogate after the resize form is closed, like ...

DialogResult dr = resizeForm.ShowDialog();

if( dr != DialogResult.Cancel )
{
  var newH = resizeForm.Height;
  var newW = resizeForm.Width;

  // do something with new vals.
}