Question

I am new to C# and I am following this C# tutorial at the moment. In this tutorial I came across the exercise to develop a calculator.

A C# .Net Calculator – Design Stage

In the solution given in the exercise, each digit button was given a btn*_click method which can be generalized pretty easily.

_{(source: homeandlearn.co.uk)}

How can we write the code, so that we can generalize these 10 functions? I though it can be done by modifying initializeComponent(), but comment about it says it should not be modified using code editor.

How can this problem be tackled?

Answer 1

The tutorial you posted is using the visual editor in visual studios. By default the designer will generate code with the convention {controlname}_{eventname} you can explicitly assign a different event name in the properties window, and all the buttons could share the same event method.

And then it looks like you could refactor this like:

private void btn_click(object sender, EventArgs e)
{
    Button btn = sender as Button;
    if(btn != null)
       txtDisplay.Text += btn.Text;
}

I hope that helps.