我如何设法拆分 C# 中的 int 值

Question

For this int has the value of "19971998". I really wanted to split this value into like this "1997 - 1998"??

int index = Convert.ToInt32(radioListBox1.SelectedIndex);
string indexvalue = Convert.ToString(this.radioListBox1.Items[index]);
string input = Regex.Replace(indexvalue, "[^0-9]+", string.Empty);
MessageBox.Show(input);

Answer 1

you can write like:

int index = Convert.ToInt32(radioListBox1.SelectedIndex);
string indexvalue = Convert.ToString(this.radioListBox1.Items[index]);
string input = Regex.Replace(indexvalue, ".{4}", "$0-");
MessageBox.Show(input);

Answer 2

var s = "19971998";
String.Format("{0}-{1}", s.Substring(0,4), s.Substring(4, 4)));

Answer 3

To make it work with Regex you'd need to do the following:

string input = Regex.Replace(indexvalue, "^(.{4})", "$1-");

But as someone suggested, it may be even easier to do this one.

string input = indexvalue.Insert(4, "-");

Answer 4

    int index = Convert.ToInt32(radioListBox1.SelectedIndex);
    string indexvalue = Convert.ToString(this.radioListBox1.Items[index]);
    string input = Regex.Replace(indexvalue, "[^0-9]+", string.Empty);

The problem was solved, this was missing my code.

    if (input.Length == 8) input = input.Insert(4, " - ");

    MessageBox.Show(input);