💡 C# 13 Drops With Param Collections and Cool New Features

C# 13 has arrived with a host of new features, including param collections for flexible function parameters and a new escape sequence for the ESCAPE character.

C# 13 was released at the end of previous month. Let’s look into it. What’s important it already is supported on .NET 9.

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The new release contains params collections, meaning there are more types you can use for function params. There’s a new type for thread synchronization called System. Threading.Lock, a new escape sequence:

You can use \e as a character literal escape sequence for the ESCAPE character, Unicode U+001B. Previously, you used \u001b or \x1b. Using \x1b wasn't recommended because if the next characters following 1b were valid hexadecimal digits, those characters became part of the escape sequence.

The compiler also is more performant when handling method groups, that is overloads with the same name.

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My favorite is however the extension for the implicit “from the end” operator. So far I’ve used it and it’s quite handy. But you couldn't use it in object initializers. With C# 13 you can do something like that:

var countdown = new TimerRemaining()
{
    buffer =
    {
        [^1] = 0,
        [^2] = 1,
        [^3] = 2,
    }
};

Check out the official announcement, because there’s more stuff as well: More

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C# 13 introduces exciting new features that enhance flexibility and performance, from param collections to an improved escape sequence. Explore these updates and see how they can streamline your development process and make coding in C# even more efficient.

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