1 Nullable<Int32> x = null; 2 Nullable<Int32> y = null; 3 Nullable<Int32> z = null; 4 Int32 res = x ?? y ?? z ?? 110;
等价于:
1 if (null != x) 2 { 3 res = x.Value; 4 } 5 else 6 { 7 if (null != y) 8 { 9 res = y.Value; 10 } 11 else 12 { 13 if (null != z) 14 { 15 res = z.Value; 16 } 17 else 18 { 19 res = 110; 20 } 21 } 22 }