Bug 22114 - String.Format() incorrectly parses {{{0:C}}}
Summary: String.Format() incorrectly parses {{{0:C}}}
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 3.4.0
Hardware: All All
: --- normal
Target Milestone: Untriaged
Assignee: Marek Safar
Depends on:
Reported: 2014-08-14 12:21 UTC by Chris Howie
Modified: 2014-08-21 04:36 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Chris Howie 2014-08-14 12:21:29 UTC
The following call is processed differently on MS.NET than on Mono:

    string.Format("{{{0:C}}}", 100M);

On Mono, this returns what you would expect: "{$100.00}"

On MS.NET, this returns: "{C}"

Apparently this is due to a documented gotcha in how MS.NET parses these strings.  You would expect the parse to go like this:

    {{ {0:C} }}

But in MS.NET, it goes like this:

    {{ {0:C }} }

(The first two } characters become a literal } that is interpreted as part of the format specifier, resulting in an invalid specifier.)

Further reading on the topic: http://blogs.msdn.com/b/brada/archive/2003/12/26/50978.aspx
Comment 1 Marek Safar 2014-08-21 04:36:01 UTC
Fixed in master