New in .NET 9.0(6): New escape character for console output

with the elders VT100/ANSI escape code You can still trigger a variety of formatting in console applications today, including 24-bit color, boldface, underline, strikethrough, and flashing. VT100/ANSI codes are introduced by the escape character (ASCII character 27, hexadecimal: 0x1b).

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New Escape Sign for Console Editions in .NET 9.0 (6)

Before C# 13.0, you could escape this ASCII character 27 in .NET console applications Console.WriteLine() just express strangely \u001b, \U0000001b Or \x1b, Although the latter is not recommended: “If you use the escape sequence \x, specify less than four hexadecimal digits, and the characters immediately following the escape sequence are valid hexadecimal digits (for example 0-9, A-F, and A-F ), these are interpreted as part of the escape. For example, \xA1 produces “¡” (matches the code point U+00A1), but if the next character is “A” or “a”. is instead interpreted as \xA1A and generates the code point “च” (matches the code point U+0A1A), in such cases च is a Punjabi character and the language spoken in Pakistan and India. ,Misinterpretations can be avoided by specifying all four hexadecimal digits (e.g. \x00A1).”

Typically, before C# 13.0 the output looked like this with VT100/ANSI escape codes:

Console.WriteLine("This is a regular text");
Console.WriteLine("\u001b(1mThis is a bold text\u001b(0m");
Console.WriteLine("\u001b(2mThis is a dimmed text\u001b(0m");
Console.WriteLine("\u001b(3mThis is an italic text\u001b(0m");
Console.WriteLine("\u001b(4mThis is an underlined text\u001b(0m");
Console.WriteLine("\u001b(5mThis is a blinking text\u001b(0m");
Console.WriteLine("\u001b(6mThis is a fast blinking text\u001b(0m");
Console.WriteLine("\u001b(7mThis is an inverted text\u001b(0m");
Console.WriteLine("\u001b(8mThis is a hidden text\u001b(0m");
Console.WriteLine("\u001b(9mThis is a crossed-out text\u001b(0m");
Console.WriteLine("\u001b(21mThis is a double-underlined text\u001b(0m");
Console.WriteLine("\u001b(38;2;255;0;0mThis is a red text\u001b(0m");
Console.WriteLine("\u001b(48;2;255;0;0mThis is a red background\u001b(0m");
Console.WriteLine("\u001b(38;2;0;0;255;48;2;255;255;0mThis is a blue text with a yellow background\u001b(0m");

Since C# 13.0 is now \e Escape character as a short form of ASCII 27, so that character strings become more compact and clear:

Console.WriteLine("This is a regular text");
Console.WriteLine("\e(1mThis is a bold text\e(0m");
Console.WriteLine("\e(2mThis is a dimmed text\e(0m");
Console.WriteLine("\e(3mThis is an italic text\e(0m");
Console.WriteLine("\e(4mThis is an underlined text\e(0m");
Console.WriteLine("\e(5mThis is a blinking text\e(0m");
Console.WriteLine("\e(6mThis is a fast blinking text\e(0m");
Console.WriteLine("\e(7mThis is an inverted text\e(0m");
Console.WriteLine("\e(8mThis is a hidden text\e(0m");
Console.WriteLine("\e(9mThis is a crossed-out text\e(0m");
Console.WriteLine("\e(21mThis is a double-underlined text\e(0m");
Console.WriteLine("\e(38;2;255;0;0mThis is a red text\e(0m");
Console.WriteLine("\e(48;2;255;0;0mThis is a red background\e(0m");
Console.WriteLine("\e(38;2;0;0;255;48;2;255;255;0mThis is a blue text with a yellow background\e(0m");

(rme)