Conditional FormatString or String.Format

Question

I saw this post: How to Conditionally Format a String in .Net?

The first part of the question points to the ability to use conditional formats. How is this done?

In my case, I want to do for instance 100,000 as $100k, and 1,000,000 as $1m. I want to be able to do it with just the FormatString in markup (Silverlight). This is a case where I cant use a value converter (it's inside a style).

Is this possible?

You need to code it yourself. Check out: stackoverflow.com/questions/2134161/… — Mikael Svenson
– Mikael Svenson, Commented Dec 31, 2010 at 22:34
what does this refer to in that post I linked to? Int32 i = 0; i.ToString("$#,##0.00;($#,##0.00);Zero"); — Roger
– Roger, Commented Dec 31, 2010 at 22:50

Pauli Østerø · Accepted Answer · 2010-12-31 23:26:38Z

4

You can implement your own IFormatProvider and define ie. custom and pass that when calling String.Format() or ToString().

Example of this can be found here http://msdn.microsoft.com/en-us/library/system.iformatprovider.aspx or here http://www.codeproject.com/KB/cs/custstrformat.aspx.

public class StringFormatInfo : IFormatProvider, ICustomFormatter
{
   ...
}

return number.ToString("{0:custom}", new StringFormatInfo());

edited Dec 31, 2010 at 23:26

answered Dec 31, 2010 at 22:53

Pauli Østerø

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3 Comments

Pauli Østerø Over a year ago

i've used it alot myself... its a clean nice api instead of using all kinds of helper methods.

Roger Over a year ago

I don't think this is an option for me because I am using a template binding. I need this inside a style that is applied to the label on the axis of a chart (Silverlight Toolkit). I'll give it a try.

Pauli Østerø Over a year ago

There is an article here about how to use custom IFormatProvider's when databinding in WPF timheuer.com/blog/archive/2008/07/30/…

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