c#中如何使用Normal方法调用按钮点击事件？

Question

I have a method name loadTest123(). I tried to call Button1_Click event from loadTest123(). But event not occurred. I am trying to debug with break point in Button1_Click event but not triggering.

Eg:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Linq;

namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            loadTest123();
        }

        public Button Coke = new Button();

        public void loadTest123()
        {
            Coke.Click += new EventHandler(button1_Click);
        }

        private void button1_Click(object sender, EventArgs e)
        {
             MessageBox.Show("Hello!!!");      
        }        
    }
}

Please help me to solve this issue.

Answer 1

what you have done is just binding of event, you have not called it. You have to call that event to actually run it.

Do this,

button1.PerformClick();

OR,

button1_Click(null, new EventArgs());

in your method.

Answer 2

What you have in loadTest123() method is for subscribing to an event, it won't trigger subscribed method until you perform click on it.

Also, you have attached button1_Click to Click event but there is no method declared with the name. You need (something) like this.

   private void button1_Click(object sender, EventArgs e)
   {
         MessageBox.Show("Hello!!!");      
   }        

If you are looking to perform click programatically , there is a PerfromClick method on button, you could use it.

Coke.PerformClick();

You created the button but not added to controls, is this intentional?

Answer 3

see below code and comments

public Form1()
{
    InitializeComponent();
    loadTest123();
}

public Button Coke = new Button();

public void loadTest123()
{
    // BELOW LINE IS ONLY FOR REGISTER YOUR BUTTON'S CLICK EVENT
    Coke.Click += new EventHandler(button1_Click);

    // FIRE YOUR EVENT IN CODE BEHIND
    Coke.PerformClick();
    // OR
    button1_Click(null, new EventArgs());
}

private void button1_Click(object sender, EventArgs e)
{
     MessageBox.Show("Hello!!!");      
}        

Answer 4

This works for me:

InvokeOnClick(button, e);