Is there a not null coalescing operator in C# which in case could be used such as:
public void Foo(string arg1)
{
Bar b = arg1 !?? Bar.Parse(arg1);
}
The following case made me think of it:
public void SomeMethod(string strStartDate)
{
DateTime? dtStartDate = strStartDate !?? DateTime.ParseExact(strStartDate, "dd.MM.yyyy", System.Globalization.CultureInfo.InvariantCulture);
}
I might not have strStartDate information, which in case will be null but if i do; i'm always certain that it will be in expected format. So instead of initializing dtStartDate = null and trying to parse and set the value within try catch block. It seems to be more useful.
I suppose the answer is no (and there is no such operator !?? or anything else) I wonder if there's a way to implement this logic, would it be worth and what would be the cases that it comes useful.
Mads Torgersen has publicly said that a null-propagating operator is under consideration for the next version of C# (but also emphasised that this doesn't mean it will be there). This would allow code like:
var value = someValue?.Method()?.AnotherMethod();
where the ?. returns null if the operand (on the left) is null, else will evaluate the right hand side. I suspect that would get you a lot of the way here, especially if combined with (say) extension methods; for example:
DateTime? dtStartDate = strStartDate?.MyParse();
where:
static DateTime MyParse(this string value) {
return DateTime.ParseExact(value, "dd.MM.yyyy",
System.Globalization.CultureInfo.InvariantCulture
);
However! You could do the same thing right now just using extension methods:
DateTime? dtStartDate = strStartDate.MyParse();
static DateTime? MyParse(this string value) {
if(value == null) return null;
return DateTime.ParseExact(value, "dd.MM.yyyy",
System.Globalization.CultureInfo.InvariantCulture
);
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