Page 194 - CSharp/C#

Conditional expressions and format specifiers can be mixed:

Console.WriteLine($"Environment: {(Environment.Is64BitProcess ? 64 : 32):00'-bit'} process");

Output:

Environment: 32-bit process

Escape sequences

Escaping backslash (\) and quote (") characters works exactly the same in interpolated strings as
in non-interpolated strings, for both verbatim and non-verbatim string literals:

Console.WriteLine($"Foo is: {foo}. In a non-verbatim string, we need to escape \" and \\ with
backslashes.");
Console.WriteLine($@"Foo is: {foo}. In a verbatim string, we need to escape "" with an extra
quote, but we don't need to escape \");

Output:

Foo is 34. In a non-verbatim string, we need to escape " and \ with backslashes.
Foo is 34. In a verbatim string, we need to escape " with an extra quote, but we don't
need to escape \

To include a curly brace { or } in an interpolated string, use two curly braces {{ or }}:

$"{{foo}} is: {foo}"

Output:

{foo} is: 34

View Demo

FormattableString type

The type of a $"..." string interpolation expression is not always a simple string. The compiler
decides which type to assign depending on the context:

string s = $"hello, {name}";
System.FormattableString s = $"Hello, {name}";
System.IFormattable s = $"Hello, {name}";

This is also the order of type preference when the compiler needs to choose which overloaded
method is going to be called.

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