why do I have a syntax error when using concatenation?

Question

trying o use concatenation programming... instead of saying

UpdatePLOF.FolderPath = "PLOF" + plof.Id + ".txt";

trying something like:

UpdatePLOF.FolderPath = "PLOF {0} .txt", plof.Id;

for PLOF {0} .txt is telling me only assignment, call, increment etc... for plof.id it is telling me ; is needed

What is wrong with `"PLOF" + plof.Id + ".txt";` ? See http://stackoverflow.com/questions/296978/when-is-it-better-to-use-string-format-vs-string-concatenation — Habib, Mar 14 '14 at 15:52

score 5 · Accepted Answer · answered Mar 14 '14 at 15:49

5

You need a String.Format

UpdatePLOF.FolderPath = string.Format("PLOF {0} .txt", plof.Id);

answered Mar 14 '14 at 15:49

Dave Bish

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score 0 · Answer 2 · answered Mar 14 '14 at 15:54

There are several ways to concatenate strings in C# and .NET.

String.Format is nice for when you'd like to be able to see what the resultant string will look like. However, it is significantly slower than the + operator, which the compiler can convert to String.Concat. String.Format has the extra overhead of having to parse the format string. In your case, it's probably a micro-optimization, but it's something to be aware of.

why do I have a syntax error when using concatenation?

2 Answers2