I’ve seen this pattern many times.
<code>var image = @Model?.Image?.First();
</code>
<code>var image = @Model?.Image?.First();
</code>
var image = @Model?.Image?.First();
Or
<code>var cId = cust!.Id;
</code>
<code>var cId = cust!.Id;
</code>
var cId = cust!.Id;
I usually get the prompt from Visual Studio/ReSharper to add ? Or ! In the code but I’ve understood ? Is used to check that object isn’t null before going into the next section of code but I can’t find any documentation or explanation on exactly what these are or called and why it makes VS/RS prompt to add these. I know I can declare code such as
<code>int? MyInt = 1;
</code>
<code>int? MyInt = 1;
</code>
int? MyInt = 1;
To make it nullable but trying to get a better understanding on ? And !.
Does anyone have any reference or explanation so I can understand between the two?
I’ve checked MSDN but since I don’t know what this pattern is called in not finding anything related to this or if I do is targeting something else.