/// <summary>
/// Raises the <see cref="E:Parsing"/> event, to allow easily hooking
/// into the parse logic.
/// </summary>
/// <param name="e">The <see cref="System.Windows.Controls.UpDownParsingEventArgs<T>"/>
/// instance containing the event data.</param>
protected virtual void OnParsing(UpDownParsingEventArgs <T> e)
{
EventHandler <UpDownParsingEventArgs <T> > handler = Parsing;
if (handler != null)
{
handler(this, e);
}
}
protected internal virtual void ApplyValue(string text)
{
UpDownParsingEventArgs <T> parsingArgs = new UpDownParsingEventArgs <T>(text);
Exception ParsingException = null;
T regularParsedValue = default(T);
try
{
// parse value might throw an exception.
regularParsedValue = ParseValue(text);
parsingArgs.Value = regularParsedValue;
}
catch (Exception error)
{
ParsingException = error;
}
try
{
OnParsing(parsingArgs);
}
catch (Exception)
{
// swallow any exception during custom parsing.
}
if (ParsingException == null)
{
// if no error, regularParsedValue must be initialized.
T newValue = parsingArgs.Handled ? parsingArgs.Value : regularParsedValue;
if (Value.Equals(newValue))
{
// although value might be the same, still format the value.
SetTextBoxText();
}
Value = newValue;
}
else
{
if (parsingArgs.Handled)
{
if (Value.Equals(parsingArgs.Value))
{
// although value might be the same, still format the value.
SetTextBoxText();
}
Value = parsingArgs.Value;
}
else
{
UpDownParseErrorEventArgs args = new UpDownParseErrorEventArgs(text, ParsingException);
OnParseError(args);
if (!args.Handled)
{
// default error handling is to discard user input and revert to the old text
SetTextBoxText();
}
}
}
}
