use format string from a property

Question

the situation I'm in is following:

I have an interpolated string looking like this:

DateTime DateOfSmth;
string PlaceOfSmth;
$"{DateOfSmth}, {PlaceOfSmth}".Trim(' ',',');

And a format that should be used on it in:

string Format = "{0:dd.MM.yyyy}";

Now I'd like to use the format in the property Format in the interpolated string, but I don't know how.

I.E: i'd like something like this to be the result:

$"{DateOfSmth:Format}, {PlaceOfSmth}".Trim(' ',',');

Could someone help?

Answer 1

Try this:

string format = "dd.MM.yyyy";
Console.WriteLine($"{DateOfSmth.ToString(format)}");

Answer 2

In the end I left the accepted answer to @diiN_. The solution i used is:

//this format is given and I can't change it
string Format = "{0:dd.MM.yyyy}";
DateTime? Date = DateTime.Today;
string Place = "Washington";

string.Format(Format + ", {1}", Date, Place);