C# escape curly bracket not working with format modifier?

Question

I know we can escape curly bracket in C# using {{ and }}. But they don't seem to work well if they are right after a format modifier (like {0:F6}).

string str;

// Prints "{3.14}" as expected
str = string.Format("{{{0}}}", 3.14);
Console.WriteLine(str);

// Expected "{3.140000}", found "{F6}"
str = string.Format("{{{0:F6}}}", 3.14);
Console.WriteLine(str);

Answer 1

This is how C# processes curly brackets, it's well known. See here

You can escape it like this (for example, there are different ways):

 var str = string.Format("{0}{1:F6}{2}", "{", 3.14, "}");
 Console.WriteLine(str);

Answer 2

Try this:

 String.Format("{0}{1:F6}{2}", "{",3.14, "}")