/// <summary>
/// 当前登录用户是否为管理员
/// 百万次执行时间：8063、9097、9755 ms
/// </summary>
/// <returns></returns>
public static bool IsAdmin()
{
const int SECURITY_BUILTIN_DOMAIN_RID = 0x20;
const int DOMAIN_ALIAS_RID_ADMINS = 0x220;
byte[] NtAuthority = new byte[6];
NtAuthority[5] = 5; // SECURITY_NT_AUTHORITY
IntPtr AdministratorsGroup;
int ret = PermissionAPI.AllocateAndInitializeSid(NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, out AdministratorsGroup);
if (ret != 0)
{
if (PermissionAPI.CheckTokenMembership(IntPtr.Zero, AdministratorsGroup, ref ret) == 0)
{
ret = 0;
}
PermissionAPI.FreeSid(AdministratorsGroup);
}
return(ret != 0);
}