C# assign an event to a "group" of controls?

Question

I have a big numbers of labels custom controls let's say 100. I would like to give them an MouseHover event. I could do something like:

private void label_custom1_MouseHover(object sender, EventArgs e)
        {
            TextBox.Text = label_custom1.backcolor.ToString();
        }

But then I would need to do that 100 times. Since I have 100 of them. Is there a way to do that only once? I guess I should probably declare the function in my custom_label class but so far I couldn't make it work. Any Idea how to proceed?

Answer 1

Firstly, create a common event, we receive the Label posted here.

private void Common_MouseHover(object sender, EventArgs e)
{
    TextBox.Text = (sender as Label).BackColor.ToString();
}

Give the common event to all Labels on the form. Here I assume Label names start with label, for example label1, label2, label3 ...

private void SetEventAllLabels()
{
    var labels = Controls.OfType<Label>().Where(x => x.Name.StartsWith("label"));
    foreach (var label in labels)
    {
        label.MouseHover += Common_MouseHover;
    }
}

Call the SetEventAllLabels () method in the Load method of the form.

private void Form1_Load(object sender, EventArgs e)
{
    SetEventAllLabels();
}