.net 2.0 - WriteLine string containing '{' character throws FormatException in C# -

.net 2.0 - WriteLine string containing '{' character throws FormatException in C# -

this question has reply here:

how escape braces (curly brackets) in format string in .net 4 answers

this throws formatexception:

console.writeline("strict digraph {0}\n{", project.projectname);

but fine:

console.writeline("strict digraph {0}\n", project.projectname);

i need trailing '{' , \{ isn't valid escape code. wrong code , how create work?

you need escape curly bracket curly bracket:

console.writeline("strict digraph {0}\n{{", project.projectname);

for farther info have @ relevant msdn article composite formatting , section "escaping braces".

is states that

opening , closing braces interpreted starting , ending format item. consequently, must utilize escape sequence display literal opening brace or closing brace. specify 2 opening braces ("{{") in fixed text display 1 opening brace ("{"), or 2 closing braces ("}}") display 1 closing brace ("}"). braces in format item interpreted sequentially in order encountered. interpreting nested braces not supported.

but mind you. can result in unexpected behavior: take format string {{{0:d}}} example. should output "{10}" example, shouldn't it?. should, doesn't. msdn-article linke above states that

the first 2 opening braces ("{{") escaped , yield 1 opening brace. the next 3 characters ("{0:") interpreted start of format item. the next character ("d") interpreted decimal standard numeric format specifier, next 2 escaped braces ("}}") yield single brace. because resulting string ("d}") not standard numeric format specifier, resulting string interpreted custom format string means display literal string "d}". the lastly brace ("}") interpreted end of format item. the final result displayed literal string, "{d}". numeric value formatted not displayed.

to circumvent msdn suggests utilize next code:

var result = string.format("{0}{1:d}{2}", "{", 10, "}");

c# .net-2.0