Unable to parse expression strings that have multiple #

[jobanputra]

When the expression contains multiple # characters, the Expression constructor throws the following exception: "String '' was not recognized as a valid DateTime."

For example the expression that I am trying to parse is

Format("{0:(###) ###-####}", "9999999999")

Update: I understand that NCalc uses sharps (#) to delimit date. However # is a custom string specifier in the .NET framework.

[petli]

Try this instead:

Format('{0:(###) ###-####}', '9999999999')

The NCalc expression syntax uses ' instead of " to represent strings (see https://github.com/ncalc/ncalc/wiki/Values).

You should've gotten a syntax error from the " rather than it continuing to the #, though. I think it looks like the lexer is configured to recover rather than immediately throwing an error, I'll look further into that.

[petli]

Fix for the missing syntax error exception is included in this version: https://www.nuget.org/packages/NCalcAsync/2.1.5

[petli]

Thanks for reporting this! It was a pretty deep bug in the expresison parser which have probably frustrated others over the years NCalc have existed.