private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (CIDR.SelectedItem != null)
{
ComboBoxItem a = (ComboBoxItem)CIDR.SelectedItem;
int cidrM = int.Parse(a.Content.ToString());
IP_Mask mask = IPmain.GetIP_Mask(cidrM);
string valm = String.Format("{0}.{1}.{2}.{3}",
mask.f_octet, mask.s_octet, mask.t_octet,
mask.fo_octet);
Mask.Text = valm;
}
}
public static IP_Mask GetIP_Mask(int cidr)
{
IP_Mask mask;
byte[] bit_decimal = new byte[] { 0, 128, 192, 224, 240, 248, 252, 254, 255 };
if (cidr <= 8)
{
byte first = bit_decimal[cidr];
mask = new IP_Mask(first, 0, 0, 0);
}
else if (cidr > 8 && cidr <= 16)
{
int pwr = cidr - 8;
byte second = bit_decimal[pwr];
mask = new IP_Mask(255, second, 0, 0);
}
else if (cidr > 16 && cidr <= 24)
{
int pwr = cidr - 16;
byte third = bit_decimal[pwr];
mask = new IP_Mask(255, 255, third, 0);
}
else if (cidr > 24 && cidr <= 32)
{
int pwr = cidr - 24;
byte fourth = bit_decimal[pwr];
mask = new IP_Mask(255, 255, 255, fourth);
}
else
{
mask = new IP_Mask(0, 0, 0, 0);
}
return(mask);
}