Question

Is there a difference between :

StringBuilder requete = new StringBuilder();
requete.Append(" INSERT into " + listeLibelleTable[index] + " ( ");

and

StringBuilder requete = new StringBuilder();
requete.Append(" INSERT into ");
requete.Append(listeLibelleTable[index]);
requete.Append(" ( ");

When I say “difference” I mean in terms of performance, if this code is in a loop for example.

I think these line

requete.Append(" INSERT into " + listeLibelleTable[index] + " ( ");

is resolved at compile time so It should not be any impact in terms of performance but I’m not sure of that

Answer 1

Unless listeLibelleTable[index] can indeed be resolved at compile time (which I greatly doubt), using the string concatenation seems to be counter productive to the use of the StringBuilder.

In your second example you are concatenating a string and then appending it instead of appending to the StringBuilder.

In either case, you should probably use AppendFormat for readability:

requete.AppendFormat(" INSERT into {0} ( ", listeLibelleTable[index]);