c# - When is it better to use String.Format vs string concatenation? -

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i've got small piece of code parsing index value determine cell input excel. it's got me thinking...

what's difference between 

xlssheet.write("c" + rowindex.tostring(), null, title);

and

xlssheet.write(string.format("c{0}", rowindex), null, title);

is 1 "better" other? , why?

before c# 6

to honest, think first version simpler - although i'd simplify to:

xlssheet.write("c" + rowindex, null, title);

i suspect other answers may talk performance hit, honest it'll minimal if present @ all - , concatenation version doesn't need parse format string.

format strings great purposes of localisation etc, in case concatenation simpler , works well.

with c# 6

string interpolation makes lot of things simpler read in c# 6. in case, second code becomes:

xlssheet.write($"c{rowindex}", null, title);

which best option, imo.


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