String Interpolation in Visual Studio 2015 and IFormatProvider (CA1305)

Question

The new string interpolation style in Visual Studio 2015 is this:

Dim s = $\"Hello {name}\"

But if I use this the code analysis tells me I brea

Answer 1

If you're targeting the .NET Framework 4.6, you can take advantage of the fact that string interpolations are implicitly convertible to FormattableString:

From Customizing string interpolation in C# 6 by Thomas Levesque

A lesser known aspect of this feature is that an interpolated string can be treated either as a String, or as an IFormattable, depending on the context.

static string Invariant(FormattableString formattable)
{
    return formattable.ToString(CultureInfo.InvariantCulture);
}

string text = Invariant($"{p.Name} was born on {p.DateOfBirth:D}");