条件运算符，验证问题

Question

I'm currently writing a method that will do a couple of things:

• Verify the Operating System Version .
• Verify the Operating System Platform .
• Verify the Account isn't null .
• Verify the Account is in the proper role .

Now, if I implement the traditional nested if it works. Absolutely zero problems- However, for the sake of what I believe to be a cleaner implementation has turned into a lovely error.

The syntax:

bool result = false;

WindowsIdentity user = WindowsIdentity.GetCurrent();
WindowsPrincipal role = new WindowsPrincipal(user);

result = ((Environment.OSVersion.Platform == PlatformID.Win32NT && 
     Environment.OSVersion .Version.Major > 6 
     && role != null && role.IsInRole(WindowsBuiltInRole.Administrator) 
     ? true : false);

But I receive the following exceptions .

Operator && cannot be applied to the operands of type System.PlatformID and bool .

I'm really not sure why it doesn't work, it should. Am I implementing logic incorrectly or what, I'm really at a loss.

This syntax does work, but when I convert it to the above Conditional it doesn't.

if(Environment.OSVersion.Platform == PlatformID.Win32NT && Environment.OSVersion
    .Version.Major > 6)
{
     WindowsIdentity user = WindowsIdentity.GetCurrent();
     WindowsPrincipal role = new WindowsPrincipal(user);

     if(role != null)
     {

          if(role.IsInRole(WindowsBuiltInRole.Administrator))
          { 
               return true;
          }
     }
     return false;
}
return false;

---

Update:

This is where the red squiggle appears and Visual Studio gave the above mentioned error:

PlatformID.Win32NT && Environment.OSVersion.Version.Major > 6

Answer 1

You don't actually need to use a conditional operator—in fact … ? true : false … ? true : false never has any effect at all.

Try rewriting your code like this:

bool result = 
    (Environment.OSVersion.Platform == PlatformID.Win32NT) && 
    (Environment.OSVersion.Version.Major > 6) &&
    (role != null) && 
    (role.IsInRole(WindowsBuiltInRole.Administrator));

Answer 2

Your conditional could be rewritten like this:

bool result = Environment.OSVersion.Platform == PlatformID.Win32NT &&
              Environment.OSVersion.Version.Major > 6 &&
              role.IsInRole(WindowsBuiltInRole.Administrator);

Note that you can skip the 'role' null check, since it's never null in your case.

EDIT

As far as your update goes, the problem is this part:

bool result = PlatformID.Win32NT; // <-- this part can't compile, it's not a boolean

I believe what you meant to write is:

bool result = Environment.OSVersion.Platform == PlatformID.Win32NT; // along with your other conditions

EDIT 2

Since you've asked why doesn't your sample work (not sure what typo you have or what exactly is going on), but this code compiles as well ( NOTE: I wouldn't write it like that , just saying):

bool result = ((Environment.OSVersion.Platform == PlatformID.Win32NT &&
                Environment.OSVersion.Version.Major > 6
                && role != null && role.IsInRole(WindowsBuiltInRole.Administrator)
                    ? true
                    : false));

Answer 3

Not tested , you can try

   bool result = false;

    WindowsIdentity user = WindowsIdentity.GetCurrent();
    WindowsPrincipal role = new WindowsPrincipal(user);

    result = (((Environment.OSVersion.Platform == PlatformID.Win32NT) && 
         (Environment.OSVersion .Version.Major > 6) 
         && (role != null) && ((role.IsInRole(WindowsBuiltInRole.Administrator) 
         )? true : false))));

    return result;