How do I safely cast a System.Object to a `bool` in C#?
Like this:
if (rawValue is bool) {
bool value = (bool)rawValue;
//Do something
} else {
//It's not a bool
}
Unlike reference types, there's no fast way to try to cast to a value type without two casts. (Or a catch block, which would be worse)
There are two options... with slightly surprising performance:
Redundant checking:
if (rawValue is bool) { bool x = (bool) rawValue; ... }
Using a nullable type:
bool? x = rawValue as bool?; if (x != null) { ... // use x.Value }
The surprising part is that the performance of the second form is much worse than the first.
In C# 7, you can use pattern matching for this:
if (rawValue is bool value)
{
// Use value here
}
Note that you still end up with value
in scope (but not definitely assigned) after the if
statement.