Get control by name, including children

Question

I\'m trying to get a control by name. I wrote the following code:

public Control GetControlByName(string name)
{
    Control currentControl; 

    for(int i          


        

Answer 1

I actually wrote some extension methods at work to do just this thing:

public static class MyExensions ()
{
    public static Control FindControlRecursively (this Control control, string name)
    {
        Control result = null;

        if (control.ID.Equals (name))
        {
            result = control;
        }
        else
        {
            foreach (var child in control.Children)
            {
                result = child.FindControlRecursively (name);

                if (result != null)
                {
                    break;
                }
            }
        }

        return result;
    }

    public static T FindControlRecursively (this Control control, string name)
        where T: Control
    {
        return control.FindControlRecursively (name) as T;
    }
}

Note: Null checks removed for the sake of simplicity.

You can use it to find, say, a TextBox on your form like so:

public class MyForm : Form
{
    public void SetSomeText ()
    {
        var control = this.FindControlRecursively ("myTextboxName");

        if (control != null)
        {
            control.Text = "I found it!";
        }

        // Or...

        var control2 = this.FindControlRecursively ("myTextboxName2") as TextBox;

        if (control != null)
        {
            control2.Text = "I found this one, also!";
        }
    }
}

Edit

Of course, this is a depth-first algorithm, which might be slow depending on how deep your control chain is. You might rewrite it to use a breadth-first algorithm if you see that it is too slow.