C # VB implements conversion between 10-to-16 hexadecimal notation

Method 1: Copy codeThe Code is as follows: int d = 10;
D. ToString ("x") // or change x to X, which is a 16-Bit String.
Int x = Convert. ToInt32 (d. ToString ("x"), 16); // Convert the hexadecimal string back to the hexadecimal string.

Method 2: Copy codeThe Code is as follows: static void Main ()
{
Int I = 446;
String hex = I. ToString ("X"/* or x *);
Console. WriteLine (hex );
Int j = HexToInt (hex );
Console. WriteLine (j );
}
Static int HexToInt (string hex)
{
Hex = Regex. Replace (hex, "^ 0x", "", RegexOptions. IgnoreCase );
If (Regex. IsMatch (hex, "[g-z]", RegexOptions. IgnoreCase ))
{
Throw new Exception ("Invalid Hexadecimal Expression.: 0x" + hex );
}
Char [] chars = hex. ToUpper (). ToCharArray ();
Array. Reverse (chars );
Int dec = 0;
For (int I = 0; I <chars. Length; I ++)
{
Dec + = HexMapping (chars [I]) * (int) Math. Pow (16, I );
}
Return dec;
}
Static int HexMapping (char c)
{
Switch (c)
{
Case '0 ':
Return 0;
Case '1 ':
Return 1;
Case '2 ':
Return 2;
Case '3 ':
Return 3;
Case '4 ':
Return 4;
Case '5 ':
Return 5;
Case '6 ':
Return 6;
Case '7 ':
Return 7;
Case '8 ':
Return 8;
Case '9 ':
Return 9;
Case 'A ':
Return 10;
Case 'B ':
Return 11;
Case 'C ':
Return 12;
Case 'D ':
Return 13;
Case 'E ':
Return 14;
Case 'F ':
Return 15;
Default:
Throw new Exception ("Invalid Hexadecimal Character:" + c. ToString ());
}
}