SYSK 106: The Cost of Using WindowsPrincipal
Did you know that using WindowsPrincipal.IsInRole is ~40+% slower than doing the same work yourself? Run the code below and you’ll see … Don’t take me wrong – I do not suggest you avoid using IsInRole call; after all a single call is so fast on most computers that it is not even measurable using a timer… It’s just nice to know the cost of doing business J
public bool IsInRoleCustom(System.Security.Principal.WindowsIdentity wi, string role)
{
bool result = false;
System.Security.Principal.IdentityReference id = new System.Security.Principal.NTAccount(role).Translate(typeof(System.Security.Principal.SecurityIdentifier));
foreach (System.Security.Principal.IdentityReference group in wi.Groups)
{
if (group.Value == id.Value)
{
result = true;
break;
}
}
return result;
}
public bool IsInRoleSystem(System.Security.Principal.WindowsIdentity wi, string role)
{
return new System.Security.Principal.WindowsPrincipal(wi).IsInRole(role);
}
private void Form1_Load(object sender, EventArgs e)
{
System.Security.Principal.WindowsIdentity wi = System.Security.Principal.WindowsIdentity.GetCurrent();
string role = "Guests";
int cnt = 20000;
long t11, t12, t21, t22;
t11 = DateTime.Now.Ticks;
for (int i = 1; i < cnt; i++)
{
bool result = IsInRoleCustom(wi, role);
}
t12 = DateTime.Now.Ticks;
t21 = DateTime.Now.Ticks;
for (int i = 1; i < cnt; i++)
{
bool result = IsInRoleSystem(wi, role);
}
t22 = DateTime.Now.Ticks;
System.Diagnostics.Debug.WriteLine((t12-t11).ToString());
System.Diagnostics.Debug.WriteLine((t22-t21).ToString());
System.Diagnostics.Debug.WriteLine(((t22 - t21)/TimeSpan.TicksPerMillisecond).ToString());
System.Diagnostics.Debug.WriteLine(((float) (t22 - t21) / (t12 - t11)).ToString());
}
