v2 Compatibility with string.Format

Is Smart.Format compatible with string.Format?

Absolutely. The core of Smart.Format supports all the features of String.Format.
You can read about the standard features of String.Format at Microsoft's Composite Formatting reference page. The main features are:

Numbered Placeholders

Numbers correspond to the argument index:

Smart.Format("{0} {1}", "Hello", "World"); 
// Outputs: "Hello World"

Item Formats

Determines how to format items, such as numbers and dates:

Smart.Format("{0:N3} | {1:MMMM, yyyy}", 5.5, new DateTime(2010,3,4));
// Outputs: "5.500 | March, 2010"

Alignment

Inserts spaces before or after the item, aligning it with other items:

Smart.Format("|{0,-10}|{1,10}|", "Left", "Right");
// Outputs: "|Left      |     Right|"

Brace Escaping

Escape braces using double-braces:

Smart.Format("{{0}} {{{0}}} {{}}", "Zero");
// Outputs: "{0} {Zero} {}"

Localization

Smart.Format uses the current culture info for formatting, or you can supply your own IFormatProvider:

Smart.Format(CultureInfo.GetCultureInfo("en-US"), "{0:C}", 1234) // Outputs: "$1,234.00"
Smart.Format(CultureInfo.GetCultureInfo("ja-JP"), "{0:C}", 1234) // Outputs: "¥1234"