CODEWITHSUNDEEP
c#wpfxaml
methuselah
methuselah

Reputation: 13216

Overloading an event handler with three additional parameters

Is it possible to overload an event handler with parameters? If not, what is the best way of passing through an additional 3 parameters?

I keep getting the error message:

Here is a picture of what I am trying to achieve:

MainWindow.xaml.cs

    public bool DotControl { get; set; }
    public int Count { get; set; }
    TextBox Tb = Keyboard.FocusedElement as TextBox;

    private void RemoveLastButton_Click(object sender, RoutedEventArgs e, bool DotControl, int Count, TextBox tb)
    {
        if (Tb != null && Tb != DriverTextBox)
        {
            try
            {
                var keypadObject = new Keypad();
                keypadObject.RemoveLast(Tb, DotControl, Count);
            }
            catch (Exception)
            {
                TotalTextBox.Focus();
            }
        }
        else
        {
            TotalTextBox.Focus();
        }
    }

    private void ResetButton_Click(object sender, RoutedEventArgs e, bool DotControl, int Count, TextBox tb)
    {
        if (Tb != null && Tb != DriverTextBox)
        {
            try
            {               
                var keypadObject = new Keypad();
                keypadObject.Reset(Tb, DotControl, Count);
            }
            catch (Exception)
            {
                TotalTextBox.Focus();
            }
        }
        else
        {
            TotalTextBox.Focus();
        }
    }

Keypad.cs

    // Backspace textbox
    public void RemoveLast(TextBox tb, bool dotControl, int count)
    {
        if (tb.Text.Length > 0)
        {
            if (char.IsDigit(tb.Text[tb.Text.Length - 1])) count = 0;
            else
            {
                dotControl = false;
                count = 0;
            }
            tb.Text = tb.Text.Remove(tb.Text.Length - 1, 1);
        }
    }

    // Clear textbox
    public void Reset(TextBox tb, bool dotControl, int count)
    {
        dotControl = false;
        count = 0;
        tb.Text = "";
    }

Upvotes: 0

Views: 569

Answers (1)

Mashton
Mashton

Reputation: 6415

Event handlers have specific signatures, so call your custom method from the event handler. For example:

private void RemoveLastButton_Click(object sender, RoutedEventArgs e)
{
    RemoveLastButton(DotControl, Count, tb)
}


private void RemoveLastButton(bool DotControl, int Count, TextBox tb)
{
    if (Tb != null && Tb != DriverTextBox)
    {
        try
        {
            var keypadObject = new Keypad();
            keypadObject.RemoveLast(Tb, DotControl, Count);
        }
        catch (Exception)
        {
            TotalTextBox.Focus();
        }
    }
    else
    {
        TotalTextBox.Focus();
    }
}

BUT from the example you have you don't even need to be passing those parameters (DotControl, tb, Count) to the new RemoveLastButton method because they are properties of your class anyway so accessible. Which means you don't even need to break out into a new method like this and can just put that code in the event handler as you had it, but without changing the signature of the event handler.

Upvotes: 3

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