c# - What is the best way to retrieve a WindowsIdentity from a ClaimsIdentity -

so far found out 2 solutions windowsidentity object claimsidentity. first extract user principal name (upn).

claimsidentity ci = (claimsidentity) thread.currentprincipal.identity;     string upn = null; foreach (claim c in ci.claims) {     if (c.claimtype == claimtypes.upn)     {         upn = c.value;         break;     } } 

1. just call constructor of windowsidentity upn:

   windowsidentity winid = new windowsidentity(upn);

2. use claims windows token service (c2wts):

   windowsidentity winid = s4uclient.upnlogon(upn);

solution 1 seems me simpler , easier solution, don't understand purpose of c2wts?

any suggestions?

tnx!

1. windowsidentity winid = s4uclient.upnlogon(upn);

used excel services , performancepoint services.

its cached once used. has other checks against well.