force a string to 2 decimal places

c# asp.net double repeater
phili picture phili · Mar 2, 2011 · Viewed 84.3k times · Source

i have a repeater item that displays a double. occasionally the double seems to be coming out with 3 decimal places like this 1165.833. im trying to force it to two decimal places by wrapping it in a string.format method but it still comes out the same:

<%# String.Format("{0:f2}",DataBinder.Eval(Container.DataItem, "pricerange").ToString())%>

any ideas why?

Answer

David Ruttka picture David Ruttka · Mar 2, 2011

String simply does not implement IFormattable. To use the formatting, remove .ToString() so that you aren't passing in a String.

<%# String.Format("{0:f2}",DataBinder.Eval(Container.DataItem, "pricerange"))%>

To see this more explicitly, run this code:

Console.WriteLine(string.Format("{0:f2}", "123.888"));
Console.WriteLine(string.Format("{0:f2}", 123.888));

which outputs

123.888
123.89

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