C# Feature - Out variables

Overview

Out variables allow inline declaration of out arguments, reducing the need for separate variable setup lines.

Introduced In

C# 7.0 (2017)

Before

int number;
if (int.TryParse(text, out number))
{
  Console.WriteLine(number);
}

After

if (int.TryParse(text, out int number))
{
  Console.WriteLine(number);
}

Gotchas & Best Practices

• Use discards when the parsed value is not needed.
• Keep the variable scope small by declaring it inline.