Avoid FormattableString

Metadata

ID: csharp-best-practices/avoid-formattablestring

Language: C#

Severity: Info

Category: Performance

Description

The function string.Create prevents unnecessary allocations. It should be preferred over FormattableString functions.

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Non-Compliant Code Examples

class MyClass {
    public static void myFunction(string s)
    {
        Console.WriteLine(FormattableString.CurrentCulture("foobar"));
        Console.WriteLine(FormattableString.Invariant($"Counter: {(int)counter}"));
    }
}

Compliant Code Examples

class MyClass {
    public static void myFunction(string s)
    {
        Console.WriteLine(string.Create(CultureInfo.CurrentCulture, "foobar"));
        Console.WriteLine(string.Create(CultureInfo.InvariantCulture, $"Counter: {(int)counter}"));
    }
}