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I made a typo and Visual Studio didn't mark it as an error:
void Method(Nullable<SpriteFont>? font = null) { }
font shows up as SpriteFont?? in output. What did I just do?
UPD: Sorry, everyone, I didn't try co compile it, it just didn't show up as an error until I did. Still, it's weird that it looked as Type?? in output.
Furthermore SpriteFont is already nullable, so I was going to get an error anyway :(
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You typically use a nullable value type when you need to represent the undefined value of an underlying value type. For example, a Boolean, or bool , variable can only be either true or false . However, in some applications a variable value can be undefined or missing.
nullable (not comparable) That may be nullified; nullifiable. quotations ▼ (computing, of a variable or object) That is allowed to have a null value.
The Nullable type allows you to assign a null value to a variable. Nullable types introduced in C#2.0 can only work with Value Type, not with Reference Type. The nullable types for Reference Type is introduced later in C# 8.0 in 2019 so that we can explicitly define if a reference type can or can not hold a null value.
Nullable contexts enable fine-grained control for how the compiler interprets reference type variables. The nullable annotation context determines the compiler's behavior. There are four values for the nullable annotation context: disable: The code is nullable oblivious. Nullable warnings are disabled.
I have tried it here, just now... and I could not reproduce what you sayd.
All of the following statements fail to compile:
Nullable<int>? a = 1;Nullable<Nullable<int>> b = 1;Nullable<int?> a = 1;void A(Nullable<Nullable<int>> a)void A(Nullable<int>? a)void A(Nullable<int?> a)Using Visual Studio 2012, C# 4 or 5 I think, .Net framework 4.5.
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The editor's syntax checker failed to flag it as an error with the red squiggles. Not the compiler.
Two distinct chunks of code. They have to be, syntax checking code while you are typing it in, in essence always broken, requires a very different approach.
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