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Mark J Price 2022-02-27 19:08:52 +00:00
parent bc96ccb183
commit 18f89e91d4
62 changed files with 1661 additions and 2 deletions
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29
vscode/Chapter06/NullHandling/Program.cs Normal file
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int thisCannotBeNull = 4;
//thisCannotBeNull = null; // compile error!
WriteLine(thisCannotBeNull);
int? thisCouldBeNull = null;
WriteLine(thisCouldBeNull);
WriteLine(thisCouldBeNull.GetValueOrDefault());
thisCouldBeNull = 7;
WriteLine(thisCouldBeNull);
WriteLine(thisCouldBeNull.GetValueOrDefault());
// the actual type of int? is Nullable<int>
Nullable<int> thisCouldAlsoBeNull = null;
thisCouldAlsoBeNull = 9;
WriteLine(thisCouldAlsoBeNull);
// Declaring non-nullable variables and parameters
Address address = new();
address.Building = null;
address.Street = null!; // null-forgiving operator
address.City = "London";
address.Region = "UK";
WriteLine(address.Building?.Length);
WriteLine(address.Street.Length);