Verbatim string literal concat?

Question

I have been reading about verbatim string literals and escape sequences. What I am curious about now is if it is possible to escape and say call a dynamic source from a database when using verbatim string literals?

For example how would one achieve something like below?

string jsFunc = @"
    (function() 
        {
            var image = 'Images/" + {sqlConn[2]} + "';
            var img = document.getElementbyId('img1');
            img.src = image;
        }
     );";

Thanks

Answer 1

You have 3 options:

string jsFunc = $@"
    (function() 
        {{
            var image = 'Images/{sqlConn[2]}';
            var img = document.getElementbyId('img1');
            img.src = image;
        }}
     );";

(Notice the $ before the @ and the removal of the string concatenation part, which turns this into an interpolated string. Also note that I had to double up the braces to avoid tripping up the underlying string.Format .)

Or this:

string jsFunc = string.Format(@"
    (function() 
        {{
            var image = 'Images/{0}';
            var img = document.getElementbyId('img1');
            img.src = image;
        }}
     );", sqlConn[2]);

Which is just good'ol string.Format . Same here about doubling up the braces.

Or this:

string jsFunc = @"
    (function() 
        {
            var image = 'Images/" + sqlConn[2] + @"';
            var img = document.getElementbyId('img1');
            img.src = image;
        }
     );";

(Notice that I added a new @ before the rest of the string after the concatenation, and also removed the braces.)