Calling a function in the Form Class from another Class, C# .NET

Question

Can someone please let me know by some code how I can call a function located in the Form class from another class?

Some code will be of great help!

thanks

Answer 1

It's quite easy. Either pass a reference to an existing form in the call, or create a new instance of your form and then call your method just like any other:

public class MyForm : Form
{
    public void DoSomething()
    {
        // Implementation
    }
}

public class OtherClass
{
    public void DoSomethingElse(MyForm form)
    {
        form.DoSomething();
    }
}

Or make it a static method so you don't have to create an instance (but it won't be able to modify open form windows).

UPDATE

It looks like the ImageProcessing class never gets a reference to the form. I would change your code slightly:

class ImageProcessing
{
    private frmMain _form = null;    

    public ImageProcessing(frmMain form)
    {
        _form = form;
    }

    private UpdateStatusLabel(string text)
    {
        _form.StatusUpdate(text);
    }
}

And then one small tweek in the Form constructor:

ImageProcessing IP = new ImageProcessing(this);