如何从Console.Write（）转义{0}

Question

Consider below output

'{0}' is replaced to 'Hello'

To print above text I can write this

Console.Write("'{0}' is replaced to '{1}'", "{0}", "Hello");

But here I want to use single argument to be passed for that string

Console.Write("'{0}' is replaced to '{0}'", "Hello");
                 ^to escape somehow this

I want to escape first '{0}'. I tried this

Console.Write("'\\{0}' is replaced to '{0}'", "Hello");

Output

'\Hello' is replaced to 'Hello'

Is there any way to print '{0}' instead of replacing it with first argument of that string (ie second argument of Console.Write(...) )

Answer 1

For string.Format and methods that use string args ie Console.Write() and Console.WriteLine() or String Interpolation , you use double braces

Ie

use {{ blah }} to encode literal { blah } .

or

use {{0}} to encode literal {0} .

use I need braces {{ for some reason to encode I need braces { for some reason

string.Format Documentation

How do I include literal braces ("{" and "}") in the result string? For example, how do you prevent the following method call from throwing a FormatException exception?

result = String.Format("The text has {0} '{' characters and {1} '}' characters.", nOpen, nClose);

A single opening or closing brace is always interpreted as the beginning or end of a format item. To be interpreted literally, it must be escaped. You escape a brace by adding another brace ("{{" and "}}" instead of "{" and "}"), as in the following method call:

result = String.Format("The text has {0} '{{' characters and {1} '}}' characters.", nOpen, nClose);

However, even escaped braces are easily misinterpreted. We recommend that you include braces in the format list and use format items to insert them in the result string, as the following example shows.

result = String.Format("The text has {0} '{1}' characters and {2} '{3}' characters.", nOpen, "{", nClose, "}");

Answer 2

using Console.Write("\\'{0}\\' is replaced to '{1}'", "{0}", "Hello");

Output : '{0}' is replaced to 'Hello'

using Console.Write("{{0}} is replaced to '{1}'", "{0}", "Hello");

Output : {0} is replaced to 'Hello'

Answer 3

In C#6 and above you cans use Interpolated Strings :

string hello = "Hello";
Console.WriteLine($"'{{0}}' is replaced to '{hello}'");

Or below C#6

string hello = "Hello";
Console.WriteLine("'{{0}}' is replaced to '{0}'", hello);

Answer 4

Console.Write("'{{0}}' is replaced to '{0}'", "Hello");

Answer 5

This is that what you want :
1. Console.WriteLine($"{{0}} is replaced to '{"Hello"}'");
2. Console.WriteLine("{{0}} is replaced to '{0}'","Hello");