How to convert an integer to fixed length hex string in C#?

Question

I have an integer variable with max value of 9999.

I can convert to fixed length string (4-characters):

value.ToString(\"0000\");

a

Answer 1

String.Format( "{0:X2}", intValue)

Answer 2

Here is another method, You can define a function and pass it 2 values, one the actual number and the second is the max length to fix. i.e.

public string FixZero(string str, int maxlength)
{
    string zero = "000000000000000000000000000000000000000";
    int length = str.Length;
    int diff = maxlength- length;
    string z = zero.Substring(1, diff);
    z = z + str;
    return z;
}

you need integers in the format 0012, FixZero("12", 4) or for 0001234, FixZero("1234", 7)

Answer 3

Use a number after the X format specifier to specify the left padding : value.ToString("X4")