如何在运行时创建的控件上添加事件

Question

I want to create click event on buttons, (2 Buttons are creating during runtime)

I am using this to create buttons:

private void Form1_Load(object sender, EventArgs e)
{
    for (int k = 0; k < 2; k++)
    {
        Button Btn = new Button();
        Btn.Name = "btn" + k;
        Btn.Location = new System.Drawing.Point(20 + (k *110), 60 + (20 * j) * 2);
        Btn.Size = new System.Drawing.Size(90, 30);
         if (k == 0)               
            Btn.Text = "Back";

         else
            Btn.Text = "Calculate";

        this.Controls.Add(Btn);
    }
}

Thanks in Advance.

Answer 1

Simply use:

Btn.Click += button1_Click;

private void button1_Click(object sender, EventArgs e)
{

}

Answer 2

Enhance your loop like this:

for (int k = 0; k < 2; k++)
{
    Button Btn = new Button();
    Btn.Name = "btn" + k;
    Btn.Location = new System.Drawing.Point(20 + (k *110), 60 + (20 * j) * 2);
    Btn.Size = new System.Drawing.Size(90, 30);
     if (k == 0)               
        Btn.Text = "Back";

     else
        Btn.Text = "Calculate";

    Btn.Click += button_Click; // <-- This is where it happens!

    this.Controls.Add(Btn);
}

Then add the event handler:

private void button_Click(object sender, EventArgs e)
{
    Button btn = sender as Button;
    if (btn.Name.Equals("..."))
    {
    }
    else
    {
    }    
}

Please note that within the event handler you need to decide which button has been pressed by looking at the Name property.

Answer 3

像这样

   btn1.Click += new EventHandler(this.btn1_Click);

Answer 4

Btn.Click += Btn_Click;

void Btn_Click(object sender, EventArgs e)
{
    throw new NotImplementedException();
}

in VS you can type Btn.Click += the press tab twice and it will generate the method for you.