string formatting

Question

User1024191908 posted

I have a method that returns a string which represents some time in milliseconds.

I want to detect if it is less than 10 then add two zeros to its left and if it is more than 10 then add one zero.

I can easily do it with an If...Else but I wonder if there is any way to do such things with methods like String.Format()?

thanks

Answer 1

User475983607 posted

Use the string.PadLeft() function.

Answer 2

User-1838255255 posted

Hi anooshiravan,

According to your description and needs, i make a sample with two methods, please check:

Sample Code:

protected void Page_Load(object sender, EventArgs e)
        {
            string value = "5";

            // Method one
            string format1 = "D" + (value.Length + 1).ToString();
            string format2 = "D" + (value.Length + 2).ToString();
            var newvalue1 = Convert.ToUInt32(value).ToString(format1);
            var newvalue2 = Convert.ToUInt32(value).ToString(format2);
            string result1 = Convert.ToInt32(value) < 10 ? newvalue2 : newvalue1;
            Response.Write(result1 + "</br>");

            // Method two
            string result2 = Convert.ToInt32(value) < 10 ? value.PadLeft(value.Length + 2, '0') : value.PadLeft(value.Length + 1, '0');
            Response.Write(result2);
        }

Best Regards,

Eric Du