How to highlight the control when it gets focus?

Question

I can highlight the text in an individual MaskedTextBox when it gets focus using:

this.myTextBox.SelectAll();

But, I want to do it for all MaskedTextBox when a mouse click event occurs. Instead of adding 30 individual event method for each MaskedTextbox, I want to select all MaskedTextBox and have one event method to take care of it, ie:

private void MouseClickedForMaskedTextBox(object sender, MouseEventArgs e)
{
    this.ActiveControl.SelectAll();
}

But SelectAll is not available for this.ActiveControl. Is there a way to get around it?

Imbricate

Create a usercontrol that inherits from textbox, put a static method or property on it, proceeed from there? – Bashibazouk

Answer 1

sender will be the target of the event.

You could cast sender:

MaskedTextBox maskedTextBox = sender as MaskedTextBox;
if (maskedTextBox != null) { maskedTextBox.SelectAll(); }

Or in C# 7,

if (sender is MaskedTextBox maskedTextBox) 
{
    maskedTextBox.SelectAll();
} 

Another improvement is to use TextBoxBase and it will work with TextBox and RichTextBox as well.

Taiwan

In 1st option, it errors "Cannot implicitly convert type 'System.Windows.Forms.MaskedTextBox' to 'bool'. In 2nd option, it causes 3 errors ") expected" at end of MaskedTextBox, "; expected" at end of maskedTextBox, and "} expected" at end of maskedTextBox. – Imbricate

After playing around with your 1st option, I removed the "if" condition, and it works!!!! Thanks a lot!!!! – Imbricate

@Imbricate i fixed the condition - my javascript was showing. – Taiwan

Answer 2

Put the following code in the form's constructor:

        foreach (Control c in Controls)
        {
            if (c is TextBox)
            {
                TextBox tb = c as TextBox;
                tb.GotFocus += delegate { tb.SelectAll(); };
            }
        }

Amii

Answer 3

Simply do that:

private void maskedTextBox1_Enter(object sender, EventArgs e)
{
   this.BeginInvoke((MethodInvoker) delegate() {
   maskedTextBox1.SelectAll();
   });
}

Bowser

Answer 4

I found another way by creating or edit your User Control that inherits MaskedTextBox. In the designer you set true the property "OnEnterSelectAll".

public partial class MaskedTextBoxX : MaskedTextBox
{
    public MaskedTextBoxX()
    {
        InitializeComponent();
        Inicializar();
        }

    // ===============================
    // Campos Añadidos
    // ===============================

    public bool OnEnterSelectAll { get; set; } = false;


    // ===============================
    // Metodos
    // ===============================

    private void Inicializar()
    {
        // *** SELECCIONAR TODO el MarkedTextBox
        Click += delegate { if (OnEnterSelectAll) SelectAll(); };
    }
}

Aldarcy