How to replace string.empty to “0”

Question

Just like the title says.

I\'ve tried doing str.Replace(\"\",\"0\"); but it gave me error because oldValue has zero length.

Is it possi

Answer 1

You can simply return "0" for null, zero length or whitespace string using this one-liner:

return String.IsNullOrWhiteSpace(str) ? "0" : str;

Answer 2

You can't replace empty string within the string, but you can replace, say, spaces, e.g.

  str = str.Replace(" ", "0"); // providing str is not null

Or you can substitute empty string with "0":

  if (String.IsNullOrEmpty(str))
    str = "0";

When parsing string into int you can do something like that:

  int x = String.IsNullOrEmpty(str) ? 0 : Convert.ToInt32(str);

Answer 3

In method() you can do:

return String.IsNullOrEmpty(retString) ? "0" : retString;

Answer 4

After your edit:

To convert an empty string to 0, and parse a non-empty string as an integer, I wouldn't deal with a "0" at all, but combine the two in a single method. For example:

int Parse(string s, int d = 0) {
  if (string.IsNullOrEmpty(s))
    return d;

  return int.Parse(s);
}