CODEWITHSUNDEEP
c#.net
Al Lelopath
Al Lelopath

Reputation: 6778

Convert.ToDecimal(String.Format("{0:.##}", doubleAmount)) doesn't like 0.0

I have a formatting problem with this line: 

Decimal amount = Convert.ToDecimal(String.Format("{0:.##}", doubleAmount));

If doubleAmount is 0.0, it throws a format exception. How do I handle 0.0?

Upvotes: 1

Views: 1633

Answers (1)

Michael Liu
Michael Liu

Reputation: 55419

The problem is that the format string {0:.##} formats 0 as an empty string, but an empty string is not a valid argument for Convert.ToDecimal. To avoid a possible FormatException, you can use {0:0.##} to format 0 as 0.

(User sasfrog suggests {0:#.##}, but since that also formats 0 as an empty string, it doesn't work.)

However, if you're just trying to round a Double value to two decimal places and store the result in a Decimal variable, then you should use

Decimal amount = Decimal.Round((Decimal)doubleAmount, 2, MidpointRounding.AwayFromZero);

and skip the unnecessary overhead of string formatting and parsing.

Upvotes: 6

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