Numeric Data Entry in WPF

Question

How are you handling the entry of numeric values in WPF applications?

Without a NumericUpDown control, I\'ve been using a TextBox and handling its PreviewKeyDown eve

Answer 1

public class NumericTextBox : TextBox
{
    public NumericTextBox()
        : base()
    {
        DataObject.AddPastingHandler(this, new DataObjectPastingEventHandler(CheckPasteFormat));
    }

    private Boolean CheckFormat(string text)
    {
        short val;
        return Int16.TryParse(text, out val);
    }

    private void CheckPasteFormat(object sender, DataObjectPastingEventArgs e)
    {
        var isText = e.SourceDataObject.GetDataPresent(System.Windows.DataFormats.Text, true);

        if (isText)
        {
            var text = e.SourceDataObject.GetData(DataFormats.Text) as string;
            if (CheckFormat(text))
            {
                return;
            }
        }

        e.CancelCommand();
    }

    protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
    {
        if (!CheckFormat(e.Text))
        {
            e.Handled = true;
        }
        else
        {
            base.OnPreviewTextInput(e);
        }
    }
}

Additionally you may customize the parsing behavior by providing appropriate dependency properties.