Question

How can I add certain number (between 1 and 100) of whitespaces to StringBuilder?

StringBuilder nextLine = new StringBuilder();
string time = Util.CurrentTime;
nextLine.Append(time);
nextLine.Append(/* add (100 - time.Length) whitespaces */);

What would be “ideal” solution? for loop is ugly. I can also create array where whitespaces[i] contains string which contains exactly i whitespaces, but that would be pretty long hardcoded array.

Answer 1

You can use the StringBuilder.Append(char,int) method, which repeats the specified Unicode character a specified number of times:

nextLine.Append(time);
nextLine.Append(' ', 100 - time.Length);

Better yet, combine both appends into a single operation:

nextLine.Append(time.PadRight(100));

This would append your time string, followed by 100 - time.Length spaces.

Edit: If you’re only using the StringBuilder to construct the padded time, then you can do away with it altogether:

string nextLine = time.PadRight(100);