Compiler Error for Nullable Bool

Question

 bool? ispurchased = null;
    var pospurcahsed= ispurchased ? \"1\":\"2\";

Its generating exception .

Cannot implicitly con

Answer 1

This is not allows because it is unclear what null means in the context of a conditional.

Nullable Booleans can be cast to a bool explicitly in order to be used in a conditional, but if the object has a value if null, InvalidOperationException will be thrown.

It is therefore important to check the HasValue property before casting to bool.

Use like

   var pospurcahsed=  (ispurchased.HasValue && ispurchased.Value) ?......

Nullable Booleans are similar to the Boolean variable type used in SQL. To ensure that the results produced by the & and | operators are consistent with SQL's three-valued Boolean type, the following predefined operators are provided:

bool? operator &(bool? x, bool? y)

bool? operator |(bool? x, bool? y)

or you can use martin suggestion GetValueOrDefault[Thanks to martin to pointing it out ]

The GetValueOrDefault method returns a value even if the HasValue property is false (unlike the Value property, which throws an exception).