escaping curly braces for string.format [duplicate]

Question

void f(string message)
{
    string.Format(message,"x",y");
}

f() is called by g:

g()
{
   f(SomeJson+"{0}");
}

the curly braces in json are being interpreted as placeholders for values by string.format() in f(). IS there a way to have the curly braces escaped?

Answer 1

Double them up:

f(SomeJson+"{{0}}");

Or replace them in the JSON, if that's what you need:

f(SomeJson.Replace("{", "{{")
    .Replace("}", "}}") + "{0}");

You could also delegate this job to an extension method:

public static class StringExtensions
{
    public static string EscapeBraces(this string s)
    {
        return s.Replace("{", "{{")
                .Replace("}", "}}");
    }
}

f(SomeJson.EscapeBraces() + "{0}");

Or, as Ergwun says, you could simply concatenate the values afterwards. My assumption, though, is that that's less straightforward in your actual code than in this trivial example.