如何以编程方式触发单选按钮的事件处理程序？

Question

please have a look at the following code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace calc
{
    public partial class Form1 : Form
    {
        //code removed

        public Form1()
        {

            InitializeComponent();
            calculator = new Calculator();

            maleRadio.PerformClick();
            englishRadio.PerformClick();
        }


/*code removed*/

        //Action Listener for Female Radio button
        private void femaleRadio_CheckedChanged(object sender, EventArgs e)
        {
            //code removed
        }

        //Action Listener for English Radio button
        private void englishRadio_CheckedChanged(object sender, EventArgs e)
        {
            //code removed
        }



    }
}

I am somewhat new to c#. what I want to do here is to trigger the event handlers of radio buttons inside the constructor programatically. The way I followed maleRadio.PerformClick(); do nothing. how can I call the event handlers inside the constructor programmertically ?

Answer 1

You can call the event handlers like any other method:

public Form1()
{
   InitializeComponent();
   calculator = new Calculator();

   maleRadio_CheckedChanged(maleRadio, null);
   englishRadio_CheckedChanged(englishRadio, null);
}

Answer 2

You can just call the function femaleRadio_CheckedChanged on your constructor. Or you can set the value of the selected index of the radiobutton to trigger the event:

femaleRadio_CheckedChanged(null, null);
or
femaleRadio.SelectedIndex = 0;

Answer 3

Just call the method:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        radioButton1.CheckedChanged += radioButton1_CheckedChanged;

        //Triggering the handlers programmatically
        radioButton1_CheckedChanged(null, null);
        radioButton2_CheckedChanged(null, null);
    }

    //this handler is manually added in the constructor
    void radioButton1_CheckedChanged(object sender, EventArgs e)
    {
        Console.WriteLine("Test event 1");
    }

    //This handler is auto-generated by designer, after adding the event in the designer
    private void radioButton2_CheckedChanged(object sender, EventArgs e)
    {
        Console.WriteLine("Test event 2");
    }
}

Output is going to be:

Test event 1 Test event 2 Test event 1

because after the constructor has finished, radiobutton1 will be selected as default.