Introduction
Operator is introduced with
Nullable
datatype inclusion in .NET Framework operator
?? can also be referred in words like '
In case of null
, pick value from another'.
Scenario
Suppose you're assigning a value to Nullable bool like:
bool? b = null;
At the time of checking value, it will give you an error like:
if(b)
{
}
So it's always preferable to use ??
to prevent error like:
if(b ?? false)
{
}
It defines that, in case b
is null
, pick the value false
.
??
can also be used in multiple choice of value like:
bool ? a = null
bool ? b = null
bool ? c = true
a = b ?? c ?? false;
That will check b
first if b
is undefined or null
, then it will move further to check for c
if that also has null
then it will set false
to a
.
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