Nullable Bool Or - CSharp System

CSharp examples for System:Nullable

  1. HOME
  2. CSharp
  3. System
  4. Nullable

Description

Nullable Bool Or

Demo Code



public class Main{
        internal static bool? Or(this bool? left, bool? right)
        {//from  www .  j ava  2 s . c om
            // three-valued logic 'or' (T = true, F = false, U = unknown)
            //
            //      T | T = T
            //      T | F = T
            //      F | F = F
            //      F | T = T
            //      F | U = U
            //      U | F = U
            //      T | U = T
            //      U | T = T
            //      U | U = U
            bool? result;
            if (left.HasValue
                && right.HasValue)
            {
                result = left.Value || right.Value;
            }
            else if (!left.HasValue
                     && !right.HasValue)
            {
                result = null; // unknown
            }
            else if (left.HasValue)
            {
                result = left.Value
                             ? true
                             : (bool?)null; // unknown
            }
            else
            {
                result = right.Value
                             ? true
                             : (bool?)null; // unknown
            }
            return result;
        }
}

Related Tutorials