WinForms按钮单击事件未触发

Question

I don't get any errors from Visual Studio so I assumed that the code was right. When I run the code, I press the button ( button1 ), but nothing happens.

private void button1_Click(object sender, EventArgs e)
{       
    int a = 0;
    int b = 1;
    int c = 1;

    listBox1.Text += a.ToString();
    listBox1.Text += b.ToString();

    for (int i = 0; i < 20; i++)
    {
        c = b;
        b = a + b;
        a = c;

        listBox1.Text += b.ToString();
    }
}

Answer 1

Listbox's Text property won't work in this case, since it is used only to set or get the selected item in a listbox, add to the itemsource on each number, then it will work

 private void button1_Click(object sender, EventArgs e)
        {
            int a = 0;
            int b = 1;
            int c = 1;
            StringBuilder finalstring = new StringBuilder();
            listBox1.Text += a.ToString();
            listBox1.Text += b.ToString();

            for (int i = 0; i < 20; i++)
            {
                c = b;
                b = a + b;
                a = c;
                listBox1.Items.Add(b);
            }

        }

Answer 2

Does button have button1_Click registered as an event?

You can do it via your code by adding button1.Click += button1_Click , or double clicking it in your form designer.

If this still does not work, put a breakpoint on the code to see if it is executed.