How does string.Format handle null values?

Question

In the following code below, why do the two string.Format calls not behave the same way? In the first one, no exception is thrown, but in the second one an Ar

Answer 1

In case you use an interpolated string ($"", another way to format), the null is ignored, skipped. So

string nullString = null;
Console.WriteLine($"This is a '{nullString}' in a string");

will produce: "This is a '' in a string". Of course you can use the null coalescing operator in case of null to produce the output needed:

string nullString = null;
Console.WriteLine($"This is a '{nullString ?? "nothing"}' in a string");